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1) Alouette 1 Topside Electron Density Profiles Manually Scaled at CRC maxmize
Resource ID:spase://VSPO/NumericalData/Alouette1/SFS/PT32S
Start:1962-09-29 19:41:03 Observatory:Alouette 1 Cadence:32 seconds
Stop:1971-12-16 22:20:25 Instrument:Alouette 1 Sweep-Frequency Sounder Resource:NumericalData
This data set, provided by the Communications Research Centre (CRC) in Ottawa, Canada, consists of electron density profiles derived from Alouette 1 Sweep-Frequency Sounder measurements for the ionosphere above the F2 maximum (topside ionosphere). The data set is in chronological order, and includes about 27,000 profiles obtained primarily during the period 1963 to 1967. The electron density profiles were computed from digital values of frequency and virtual height, which had in turn been scaled from the ionograms. Profiles were selected because of their scientific interest. Telemetry stations are not identified, but satellite location, time of observation, solar zenith angle at the satellite, magnetic dip at the satellite, total content down to the lowest altitude of topside ionospheric reflection, and other relevant information are listed for each profile. The format gives sequences of numbers for each point scaled from the ionogram. These sequences include electron density at the successive points, and the coefficients a2, b3, b4, b5, etc. from which geometric heights can be calculated, using formulas 40 and 41 in J. E. Jackson, "The reduction of topside ionograms to electron-density profiles," Proceedings of the IEEE., p. 960, June 1969. These formulas can also be used to calculate interpolated density-height values. A CRC interpolation program (available at NSSDC) can be used with this data set. These data make up a very small portion of the recorded Alouette 1 ionograms. Latitudinal coverage is widespread, but data at longitudes near 80 deg W are more numerous than others. The data were originally provided on 9-track, 1600-bpi, odd-parity, EBCDIC tape written on a MODCOMP-4 computer. NSSDC prepared an ASCII version using the Jackson formulas to compute electron density profiles.

2) Alouette 2 Topside Sounder Ionogram Over Multiple Stations maxmize
Resource ID:spase://VSPO/NumericalData/Alouette2/SFS/Ionograms
Start:1965-11-29 13:42:37 Observatory:Alouette 2 Cadence:
Stop:1968-01-01 04:12:17 Instrument:Alouette 2 Sweep-Frequency Sounder Resource:NumericalData
This data set consists of ionograms derived from Alouette 2 Sweep-Frequency Sounder measurements for the ionosphere above the F2 maximum (topside ionosphere). These ionograms are reduced data plots showing as a function of fixed and swept frequency the echo time delay (virtual range) of pulsed radio signals at 355 virtual heights. They were converted from the original analog telemetry tapes covering various stations: Winkfield, U.K. (lat/lon=51/359); Quito, Ecuador (lat/lon=-1/281); Lima, Peru (Lat=-12, Long=283); Santiago, Chile (lat/lon=-33/298); and Falkland Is., U.K. (lat/lon=-52/302).

3) Alouette-2 Topside Sounder Ionogram Data maxmize
Resource ID:spase://VWO/NumericalData/Alouette2/SFS/PT31S
Start:1965-11-29 13:42:37 Observatory:Alouette 2 Cadence:31 seconds
Stop:1968-01-01 04:11:45 Instrument:Alouette 2 Sweep-Frequency Sounder Resource:NumericalData
These ionograms were digitized from the original Alouette 2 7-track analog telemetry tapes using the facilities of the former Data Evaluation Laboratory at the NASA/GSFC. This data restoration project is headed by Dr. R.F. Benson (NASA/GSFC). Ionograms were digitized at the rate of 40,000 16-bit samples/sec. This sample rate is higher than the Nyquist frequency of 30 kHz. The sample frequency of 40 kHz provides a measurement every 25 microseconds corresponding to an apparent range (c*t/2) interval of 3.75 km. The ionograms consist of swept-frequency operation (there is no fixed-frequency operation as in ISIS-1 and ISIS-2). The time resolution between ionograms is typically 31 seconds.

4) Alouette 2 Topside Electron Density Profiles Manually Scaled at CRC maxmize
Resource ID:spase://VSPO/NumericalData/Alouette2/SFS/PT32S
Start:1965-12-15 09:40:15 Observatory:Alouette 2 Cadence:32 seconds
Stop:1972-07-10 22:37:22 Instrument:Alouette 2 Sweep-Frequency Sounder Resource:NumericalData
This data set, provided by the Communications Research Centre (CRC) in Ottawa, Canada, consists of electron density profiles derived from Alouette 2 Sweep-Frequency Sounder for the ionosphere above the F2 maximum (topside ionosphere). The data set was originally provided on an EBCDIC magnetic tape written on an IBM 360 computer. The electron density profiles were computed from digital values of frequency and virtual height, scaled from ionograms. The data are ordered chronologically and include about 11,000 profiles. Telemetry stations are not identified, but satellite location, Greenwich mean time of observation, solar zenith angle at the satellite, dip latitude at the satellite, total electron content down to the lowest height of topside signal reflection (normally near 300 km), and other relevant information is noted with each profile. The format gives sequences of numbers for each point scaled from the ionogram. These sequences include electron density at the successive points, and the coefficients a2, b3, b4, b5, etc. from which geometric heights can be calculated, using formulas 40 and 41 in J. E. Jackson, "The reduction of topside ionograms to electron-density profiles," Proceedings of the IEEE., p. 960, June 1969. These formulas can also be used to calculate interpolated density-height values. A CRC interpolation program available at NSSDC can be used with this data set. The ionograms were selected for their scientific interest and comprise only a very small portion of reductions possible from the available ionograms. Data obtained prior to March 9, 1970, are also available on microfiche from NSSDC.

5) GIRO Ionogram-Derived Ionospheric Characteristics maxmize
Resource ID:spase://VWO/NumericalData/GIRO/CHARS.PT15M
Start:1987-01-01 00:00:05 Observatory:GIRO Group Cadence:15 minutes
Stop:2016-09-14 07:55:15 Instrument:GIRO Ionospheric Sounder Resource:NumericalData
Standard ionogram-derived characteristics obtained by Global Ionospheric Radio Observatory (GIRO) operated by University of Massachusetts Lowell. The list of standard URSI characteristics that can be derived from ionograms can be found in the SAO.XML Data Model Specification for standard ionosonde data exchange, Appendix C, http://ulcar.uml.edu/SAOXML/. In order to request the characteristics values from GIRO, it is necessary to call DIDBGetValues() servlet at GIRO server using standard HTTP call that returns a text document. The values in the document are calculated using automatic or manual interpretation of ionogram images. Each measurement is accompanied by a confidence score value (from 0 to 100, 100 is best autoscaled confidence or data obtained manually) and a set of two QD letters (qualitative and descriptive letters per URSI ionogram interpretation manual). When QD letters are set to //, reported value is obtained automatically, all other combinations of the letters correspond to manual scaling.

6) GIRO Ionogram Plots maxmize
Resource ID:spase://VWO/DisplayData/GIRO/GRM.PT15M
Start:1987-01-01 00:00:05 Observatory:GIRO Group Cadence:15 minutes
Stop:2016-09-14 07:55:14 Instrument:GIRO Ionospheric Sounder Resource:DisplayData
Collection of GIRO ionogram images at University of Massachusetts Lowell, covering selected ionosonde stations and periods of time from 1987-01-01 to current time, including 42 real-time data feeds. Total number of GIRO locations represented is 68 as of February 14, 2012. Access to images is arranged via a webpage containing a browsable data availability table. GIRO ionograms are visualized by plotting images in which received signal strength (color scale) is a function of echo delay (virtual range in vertical scale) and ionosonde frequency (horizontal scale) of the transmitted pulses. Echoes that can be used to derive remote vertical electron-density profiles, appear as discrete traces on ionograms. The ionogram traces are extracted (scaled) using image recognition software to obtain ionogram-derived characteristics of ionospheric plasma. Extracted traces and a table of major ionospheric characteristics are superimposed on the ionogram image

7) GIRO Doppler Skymap Plots maxmize
Resource ID:spase://VWO/DisplayData/GIRO/SKYMAP.PT15M
Start:1987-01-01 00:00:05 Observatory:GIRO Group Cadence:15 minutes
Stop:2016-09-14 07:55:14 Instrument:GIRO Ionospheric Sounder Resource:DisplayData
Collection of GIRO Doppler skymap images at University of Massachusetts Lowell, covering selected ionosonde stations and periods of time from 1993-07-20 to current time, including 28 real-time feeds. Total number of GIRO locations represented is 50 as of February 14, 2012. Access to images is arranged via a webpage containing a browsable data availability table. GIRO skymaps are visualized by plotting received echoes in the polar coordinate system using echo zenith and azimuth information. Color scale is used to represent Doppler Velocity of the signal reflection area in the ionosphere. Additionally, observed echoes on the skymap are used to derived zenith and azimuth of the ionospheric tilt, as well as vertical and horizontal components of the bulk ionospheric motion across the sounder location.

8) ISIS 1 Swept-/Fixed-Averaged Ionograms maxmize
Resource ID:spase://VSPO/NumericalData/ISIS1/SFS/AveragedIonongrams
Start:1969-01-30 14:50:12 Observatory:ISIS 1 Cadence:
Stop:1983-12-30 15:19:33 Instrument:ISIS1 Swept-Frequency Sounder Resource:NumericalData
This data set consists of ISIS 1 (International Satellites for Ionospheric Studies)ionograms that have been obtained through a data restoration project. The ISIS ionograms, consisting of a fixed-frequency and a swept-frequency part, were digitized from the original ISIS telemetry tapes. The digitized sounder data consisting of 8-bit receiver-amplitude values collected at a 40 kHz rate contain the time and the frequency associated with each sounder pulse. The frequency of each sounder pulse is determined from a 3rd degree interpolation between the times of the frequency markers as identified in the sounder video during the A/D operation. Included in this data set are the average-resolution ionograms (averages of each 4 successive 40 kHz 8-bit values) in CDF format. Software to read and display the individual CDF files is available at ftp://nssdcftp.gsfc.nasa.gov/spacecraft_data/isis/software/ These CDF files were produced at NSSDC from the original PI-provided ionogram data. Other ionogram data sets available at NSSDC include the full resolution ionograms and average ionograms both in the PI-provided (OS2) binary format, ASCII header files with pass-specific information and the PCM data which contain header, time, AGC, frequency-marker information and telemetry-level data from all other ISIS instruments. The binary average ionograms and the ASCII header files are available online at ftp://nssdcftp.gsfc.nasa.gov/spacecraft_data/isis/topside_sounder/ ISIS 1 and 2 data are available to the extent permitted by telemetry scheduling and the location of telemetry stations. A list of stations can be found at http://nssdc.gsfc.nasa.gov/space/isis/isis-table1-new.html and their location on a worldmap is shown in http://nssdc.gsfc.nasa.gov/space/isis/isis_station_lar.GIF (

9) ISIS-1 Topside Sounder Ionograms maxmize
Resource ID:spase://VWO/NumericalData/ISIS1/SFS/Ionogram.PT29S
Start:1969-01-30 14:50:12 Observatory:ISIS 1 Cadence:24 seconds
Stop:1983-12-30 15:19:33 Instrument:ISIS1 Swept-Frequency Sounder Resource:NumericalData
These ionograms were digitized from the original ISIS-1 7-track analog telemetry tapes using the facilities of the former Data Evaluation Laboratory at the NASA/GSFC. This data restoration project is headed by Dr. R.F. Benson (NASA/GSFC). Ionograms were digitized at the rate of 40,000 16-bit samples/sec. This sample rate is higher than the Nyquist frequency of 30 kHz. The sample frequency of 40 kHz provides a measurement every 25 microseconds corresponding to an apparent range (c*t/2) interval of 3.75 km. Each ionogram consists of a fixed-frequency and and a swept-frequency portion. The time resolution between ionograms is typically 29 seconds.

10) ISIS 1 CRC Electron Density Profiles maxmize
Resource ID:spase://VSPO/NumericalData/ISIS1/SFS/TOPS
Start:1969-02-01 15:50:12 Observatory:ISIS 1 Cadence:
Stop:1980-05-30 02:41:08 Instrument:ISIS1 Swept-Frequency Sounder Resource:NumericalData
This data set, provided by the Communications Research Centre (CRC) in Ottawa, Canada, consists of electron density profiles for the ionosphere above the F2 maximum (topside ionosphere). The data are computed from digital values of frequency and virtual height, scaled from ionograms that are measured by the ISIS 1 (International Satellites for Ionospheric Studies) Swept-Frequency Sounder. The data are ordered chronologically. Telemetry stations are not identified, but satellite location, Greenwich mean time of observation, solar zenith angle at the satellite, dip latitude at the satellite, total electron content down to the lowest height of topside signal reflection (normally near 300 km), and other relevant information is noted with each profile. The format gives sequences of numbers for each point scaled from the ionogram. These sequences include electron density at the successive points, and the coefficients a2, b3, b4, b5, etc. from which geometric heights can be calculated, using formulas 40 and 41 in J. E. Jackson, "The reduction of topside ionograms to electron-density profiles," Proceedings of the IEEE., p. 960, June 1969. These formulas can also be used to calculate interpolated density-height values. A CRC interpolation program (available at NSSDC) can be used with this data set. (

11) ISIS 2 Swept-/Fixed-Averaged Ionograms maxmize
Resource ID:spase://VSPO/NumericalData/ISIS2/SFS/AveragedIonongrams
Start:1969-01-30 14:50:12 Observatory:ISIS 2 Cadence:
Stop:1984-01-27 18:16:53 Instrument:ISIS2 Swept-Frequency Sounder Resource:NumericalData
This data set consists of ISIS 1 and 2 (International Satellites for Ionospheric Studies)ionograms that have been obtained through a data restoration project. The ISIS ionograms, consisting of a fixed-frequency and a swept-frequency part, were digitized from the original ISIS telemetry tapes. The digitized sounder data consisting of 8-bit receiver-amplitude values collected at a 40 kHz rate contain the time and the frequency associated with each sounder pulse. The frequency of each sounder pulse is determined from a 3rd degree interpolation between the times of the frequency markers as identified in the sounder video during the A/D operation. Included in this data set are the average-resolution ionograms (averages of each 4 successive 40 kHz 8-bit values) in CDF format. Software to read and display the individual CDF files is available at ftp://nssdcftp.gsfc.nasa.gov/spacecraft_data/isis/software/isis2 These CDF files were produced at NSSDC from the original PI-provided ionogram data. Other ionogram data sets available at NSSDC include the full resolution ionograms and average ionograms both in the PI-provided (OS2) binary format, ASCII header files with pass-specific information and the PCM data which contain header, time, AGC, frequency-marker information and telemetry-level data from all other ISIS instruments. The binary average ionograms and the ASCII header files are available online at ftp://nssdcftp.gsfc.nasa.gov/spacecraft_data/isis/topside_sounder/ ISIS 1 and 2 data are available to the extent permitted by telemetry scheduling and the location of telemetry stations. A list of stations can be found at http://nssdc.gsfc.nasa.gov/space/isis/isis-table1-new.html and their location on a worldmap is shown in http://nssdc.gsfc.nasa.gov/space/isis/isis_station_lar.GIF (

12) ISIS-2 Topside Sounder Ionograms maxmize
Resource ID:spase://VWO/NumericalData/ISIS2/SFS/Ionogram.PT22S
Start:1969-01-30 14:50:12 Observatory:ISIS 2 Cadence:22 seconds
Stop:1983-12-30 15:19:33 Instrument:ISIS2 Swept-Frequency Sounder Resource:NumericalData
These ionograms were digitized from the original ISIS-2 7-track analog telemetry tapes using the facilities of the former Data Evaluation Laboratory at the NASA/GSFC. This data restoration project is headed by Dr. R.F. Benson (NASA/GSFC). Ionograms were digitized at the rate of 40,000 16-bit samples/sec. This sample rate is higher than the Nyquist frequency of 30 kHz. The sample frequency of 40 kHz provides a measurement every 25 microseconds corresponding to an apparent range (c*t/2) interval of 3.75 km. Ionograms with this sample rate are designated as "full" ionograms because they have the full 3.75 km apparent-range resolution. The ionograms used for most analysis, and those available from CDAWeb, were produced by averaging every four samples of the sounder-receiver video amplitude output to yield an average value every 100 microseconds corresponding to an apparent-range resolution of 15 km. These ionogram files are referred to as "average" files with standard resolution. Each ionogram consists of a fixed-frequency and and a swept-frequency portion. The time resolution between ionograms is typically 14 or 22 seconds depending on the frequency sweep range.

13) ISIS 2 TOPIST Produced Electron Density Profiles maxmize
Resource ID:spase://VSPO/NumericalData/ISIS2/SFS/TOPIST
Start:1971-11-11 18:18:40 Observatory:ISIS 2 Cadence:
Stop:1984-01-04 05:15:38 Instrument:ISIS2 Swept-Frequency Sounder Resource:NumericalData
This data set from the ISIS 2 (International Satellites for Ionospheric Studies) Swept-Frequency Sounder consists of electron density profiles for the ionosphere above the F2 maximum (topside ionosphere). The data set was generated from the averaged ionogram binary data (SPIO-00318) recorded by the Topside Sounder. The data are obtained with the TOPIST program, which analyzes the data, automatically scales the ionogram traces and resonances, and inverts the traces into an electron density profile. The same program is available for use to hand-scale the data if desired. Output data items include spacecraft position, electron density profile, assessment of quality, resonance and cut-off frequencies, and both the O-trace and X-trace.

14) ISIS 2 CRC Electron Density Profiles maxmize
Resource ID:spase://VSPO/NumericalData/ISIS2/SFS/TOPS
Start:1971-04-08 22:27:48 Observatory:ISIS 2 Cadence:
Stop:1979-08-27 17:52:25 Instrument:ISIS2 Swept-Frequency Sounder Resource:NumericalData
This data set, provided by the Communications Research Centre (CRC) in Ottawa, Canada, consists of electron density profiles for the ionosphere above the F2 maximum (topside ionosphere). The data are computed from digital values of frequency and virtual height, scaled from ionograms that are measured by the ISIS 2 (International Satellites for Ionospheric Studies) Swept-Frequency Sounder. The data are ordered chronologically. Telemetry stations are not identified, but satellite location, Greenwich mean time of observation, solar zenith angle at the satellite, dip latitude at the satellite, total electron content down to the lowest height of topside signal reflection (normally near 300 km), and other relevant information is noted with each profile. The format gives sequences of numbers for each point scaled from the ionogram. These sequences include electron density at the successive points, and the coefficients a2, b3, b4, b5, etc. from which geometric heights can be calculated, using formulas 40 and 41 in J. E. Jackson, "The reduction of topside ionograms to electron-density profiles," Proceedings of the IEEE., p. 960, June 1969. These formulas can also be used to calculate interpolated density-height values. A CRC interpolation program (available at NSSDC) can be used with this data set. (

15) SESAME Advanced Ionospheric Sounder, Key Parameters maxmize
Resource ID:spase://VSPO/NumericalData/SESAME/KeyParameters/AIS/PT900S
Start:1992-09-01 00:00:00 Observatory:SESAME Cadence:900 seconds
Stop:2001-10-17 23:59:59 Instrument:SESAME Advanced Ionospheric Sounder Resource:NumericalData
This set of key parameters from the SESAME (Satellite Experiments Simultaneous with Antartic MEasurements) ground-based experiment contains ionospheric parameters that are derived from quarter-hourly ionograms. The three parameters include the lowest plasma frequency recorded and the highest plasma frequency recorded from the E-region (MHz), and the highest plasma frequency recorded from the F-region (MHz). Please see references: (1) Grubb, RN, The NOAA SEL HF Radar system (ionospheric sounder) NOAA Tech Memo ERL SEL-55, Space Environ Lab, Boulder, CO, 1979, (2) Jarvis,MJ and Dudeney ,JR Reduction of ambiguities in HF radar results through a revised receiving array and sounding pattern. Radio Sci 21, 151-158, 1986, and (3) Dudeney, J. R. et. al., Satellite Experiments Simultaneous with Antarctic Measurements (SESAME), Space Science Reviews, Volume 71, Issue 1-4, pp. 705-742, 1995.

16) TIMED SABER Level 1B maxmize
Resource ID:spase://VITMO/NumericalData/TIMED/SABER/L1B
Start:2002-01-25 00:00:00 Observatory:TIMED Cadence:
Stop:2016-08-15 07:58:11 Instrument:Sounding of the Atmosphere using Broadband Emission Radiometry (SABER) Resource:NumericalData
Contains the SABER Level 1B calibrated radiance profiles converted to radiance units with instrument effects removed, geolocated and gridded to uniform angle spacing.

17) TIMED SABER Level 2A maxmize
Resource ID:spase://VITMO/NumericalData/TIMED/SABER/L2A
Start:2002-01-25 00:00:00 Observatory:TIMED Cadence:
Stop:2016-08-15 07:58:11 Instrument:Sounding of the Atmosphere using Broadband Emission Radiometry (SABER) Resource:NumericalData
Contains SABER Level 1 spectra that have been processed into vertical profiles of geophysical quantities on a uniform altitude grid. These vertical profiles are at the highest available horizontal and temporal resolution. Routine products include profiles of temperature (kelvin), pressure (milibars), CO2, O3, H2O, and the volume emission rates (ergs/cm^3/sec).

18) TIMED SABER Level 2B maxmize
Resource ID:spase://VITMO/NumericalData/TIMED/SABER/L2B
Start:2002-01-25 00:00:00 Observatory:TIMED Cadence:
Stop:2016-08-15 07:58:11 Instrument:Sounding of the Atmosphere using Broadband Emission Radiometry (SABER) Resource:NumericalData
Contains SABER Level 2a data that have been further processed to produce higher level products. Includes mixing ratio - CO2, O, H; Cooling rate (kelvin/day) - CO2, NO, O3, H2O; Heating rate (kelvin/day) - O3, O2, CO2; Reaction rates (/sec); Airglow (watts/m^2/sr); Geostrophic winds (m/s).

19) Ulysses GRB Integral 0.5-Second Omnidirectional Counting Rates maxmize
Resource ID:spase://VSPO/NumericalData/Ulysses/SCE/GRB/PT1S
Start:1990-10-29 00:00:00 Observatory:Ulysses Cadence:1 second
Stop:2005-01-31 23:59:59 Instrument:Coronal Sounding (radio science) (SCE) Resource:NumericalData
This data set contains data and software for integral 0.5-second omnidirectional counting rates from the Ulysses Gamma Ray Burst (GRB) experiment. It consists of count rates from the sum of two hemispherical detectors convering 4 pi steradians and operating continuously. The detectors are 3 mm thick CsI scintillators coupled to photomultiplier tubes. The nominal energy range is 25-150 keV, but Table 1 (see below) should be consulted to find the accurate thresholds for any day of the mission. A more complete description of the instrument may be found in Hurley et al. (1992) and Cotin et al. (1983). Althoughthe prime objectives of this investigation are the study of solar and cosmic x- and gamma-ray bursts, it should be noted that the experiment is also sensitive to solar protons and electrons. The former deposit energy directly in the scintillator if they are energetic enough, while the latter may produce x- radiation locally by bremsstrahlung. Thus although the counting rates are generally stable at about 500 c/s over the long term, there are periods of weeks to a month or so when the rates increase considerably due to particles. Examples may be found in March 1991 (solar protons) and February 1992 (particles in the Jovian magnetosphere). The time resolution of the data takes on one of four values depending on the telemetry rate and instrument operating mode: 0.25, 0.5, 1, or 2 seconds. Data rate changes produce short spikes in the count rates due to a processing artefact. These can in principle be corrected if the data are scanned and the rate changes are identified; the count rate spikes can then be adjusted to their correct values. There are also short (one sample long) count rate dropouts, due to an artefact of the onboard software. These may be seen in the sample plots; they cannot be corrected for. Two figures give examples of solar and cosmic events in the data. The upper panel gives the count rates for day 142, 1993, around 8.24 hours UT. The solar event is evident as a 300 second long increase. Note the count rate dropouts. The bottom panel includes a 20 second long cosmic gamma-ray burst from day 237, 1993 around 8.79 hours UT.

20) Ulysses SCE 1-sec Radio Doppler Data C1 maxmize
Resource ID:spase://VSPO/NumericalData/Ulysses/SCE/RADIO_DOPPLER_C1/PT1S
Start:1991-08-07 00:00:00 Observatory:Ulysses Cadence:1 second
Stop:1991-09-05 23:59:59 Instrument:Coronal Sounding (radio science) (SCE) Resource:NumericalData
This data set includes dual-frequency (S- and X-band) data sampled at one-second resolution from the superior conjunction (C1) of Ulysses with the Sun during August 6 to September 5, 1991. The dual-frequency data were derived from raw tracking station data in Archival tracking Data Files (ATDFs), which include both ranging and doppler data from the standard DSN tracking receivers. The data for SCE are provided by the Radio Science Support group at the Jet Propulsion Laboratory. Two file types are included: (1) binary compressed (UNIX gzip) versions of ASCII tables of the one-second dual frequency data, and (2) ASCII document *.txt files. Each data file contains dual-frequency Doppler data at a sample rate of one point per second from each tracking pass. The data filename provides the day-of-year (doy) and ground tracking station (dss) according to the scheme "DOP91doy.dss" for the C1 conjunction. The "doy" given to each data file applies to the start of the data recording. The document file "datalist_c1.txt" contains listings of each tracking pass with such information as date, ATDF number, start and end times of pass, start and end times of data recording, pass duration, station overlaps, etc. The total volume of validated SCE Doppler data in the data set is 32.4 MB for the binary compressed *.gz files and 161.8 MB for uncompressed ASCII data. Details on the SCE Experiment are available in Bird, M. K., et al., "The Coronal Sounding Experiment," Astron. and Astrophys. Supp. Ser., 92(2), 425-430, 1992.

21) Ulysses SCE 1-sec Radio Doppler Data C4 maxmize
Resource ID:spase://VSPO/NumericalData/Ulysses/SCE/RADIO_DOPPLER_C4/PT1S
Start:1995-02-22 00:00:00 Observatory:Ulysses Cadence:1 second
Stop:1995-03-14 23:59:59 Instrument:Coronal Sounding (radio science) (SCE) Resource:NumericalData
This data set includes dual-frequency (S- and X-band) data sampled at one-second resolution from the fourth superior conjunction (C4) of Ulysses with the Sun during February 22 to March 14, 1995. The dual-frequency data were derived from raw tracking station data in Archival tracking Data Files (ATDFs), which include both ranging and doppler data from the standard DSN tracking receivers. The data for SCE are provided by the Radio Science Support group at the Jet Propulsion Laboratory. Two file types are included: (1) binary compressed (UNIX gzip) versions of ASCII tables of the one-second dual frequency data, and (2) ASCII document *.txt files. Each data file contains dual-frequency Doppler data at a sample rate of one point per second from each tracking pass. The data filename provides the day-of-year (doy) and ground tracking station (dss) according to the scheme "DOP95doy.dss" for the C4 conjunction. The "doy" given to each data file applies to the start of the data recording. The document file "datalist_c4.txt" contains listings of each tracking pass with such information as date, ATDF number, start and end times of pass, start and end times of data recording, pass duration, station overlaps, etc. The total volume of validated SCE Doppler data in the data set is 30.0 MB for the binary compressed *.gz files and 149.8 MB for uncompressed ASCII data. Details on the SCE Experiment are available in Bird, M. K., et al., "The Coronal Sounding Experiment," Astron. and Astrophys. Supp. Ser., 92(2), 425-430, 1992.

22) Ulysses SCE 10-min Radio Ranging Data C1 maxmize
Resource ID:spase://VSPO/NumericalData/Ulysses/SCE/RADIO_RANGING_C1/PT10M
Start:1991-08-07 00:00:00 Observatory:Ulysses Cadence:10 minutes
Stop:1991-09-05 23:59:59 Instrument:Coronal Sounding (radio science) (SCE) Resource:NumericalData
This data set includes differential range delay data, and electron content samples of the intervening solar corona between Ulysses and Earth, at ten-minute intervals from the Ulysses Solar Corona Experiment (SCE) during the first solar conjunction (C1) of the Ulysses mission in the interval of August 7 to September 5, 1991. SCE uses a dual-frequency radio-sounding technique to exploit the dispersive nature of ionized media on the propagation of the two downlinks. The tiny doppler shift due to plasma moving in and out of the ray path is greater at S-band than at the higher frequency X-band. Similarly, because the group velocity of waves propagating in ionized media is smaller for lower frequencies, the round-trip time of propagation for coded range signals between the spacecraft and the ground station is longer in the S-band than in the X-band. For the C1 solar conjunction the received frequencies at S-band and X-band were recorded at a nominal sample time of one per second, and differential range delay data were recorded nominally at intervals of about 10 minutes. These telemetry data are archived at JPL in raw form on Archival Tracking Data Files (ATDF's) after downlink through the NASA Deep Space Network (DSN) and intermediate processing, after which the total electron content (TEC) of the intervening coronal region between Ulysses and the Earth is determined by extraction of the ranging data from the ATDF files for further processing. The ATDF files also include doppler ranging data which are not included in this data set. All fully processed ranging data during the Ulysses C1 solar conjunction have been provided in the RANGE_C1.TAB ascii file. This file contains recorded and calculated parameters for date, time (UT - ground received), run and tracking station number, differential range delay in range units (RU), and total or columnar electron content (TEC) in units of hexems (10**16 e/sq-mt). Accuracy of the range delay measurement is of order 50 RU. Further details of the data processing are given in the SCE_DS_C1.TXT documentation file and the references therein. Details on the SCE experiment are available in Bird, M. K., et al., The Coronal Sounding Experiment, Astron. and Astrophys. Supp. Ser., 92 (2), 425-430, 1992.

23) Ulysses SCE 10-min Radio Ranging Data C4 maxmize
Resource ID:spase://VSPO/NumericalData/Ulysses/SCE/RADIO_RANGING_C4/PT10M
Start:1995-02-23 00:00:00 Observatory:Ulysses Cadence:10 minutes
Stop:1995-03-14 23:59:59 Instrument:Coronal Sounding (radio science) (SCE) Resource:NumericalData
This data set includes differential range delay data, and electron content samples of the intervening solar corona between Ulysses and Earth, at ten-minute intervals from the Ulysses Solar Corona Experiment (SCE) during the fourth solar conjunction (C4) of the Ulysses mission in the interval of February 23 to March 14, 1995. SCE uses a dual-frequency radio-sounding technique to exploit the dispersive nature of ionized media on the propagation of the two downlinks. The tiny Doppler shift due to plasma moving in and out of the ray path is greater at S-band than at the higher frequency X-band. Similarly, because the group velocity of waves propagating in ionized media is smaller for lower frequencies, the round-trip time of propagation for coded range signals between the spacecraft and the ground station is longer in the S-band than in the X-band. For the C4 solar conjunction the received frequencies at S-band and X-band were recorded at time intervals of one second, and differential range delay data were recorded nominally at intervals of about five minutes. These telemetry data are archived at JPL in raw form on Archival Tracking Data Files (ATDF's) after downlink through the NASA Deep Space Network (DSN) and intermediate processing, after which the total electron content (TEC) of the intervening coronal region between Ulysses and the Earth is determined by extraction of the ranging data from the ATDF files for further processing. The ATDF files also include doppler ranging data which are not included in this data set. All fully processed ranging data during the Ulysses C4 solar conjunction have been provided in the RANGE_C4_TAB ascii file. This file contains recorded and calculated parameters for data, time (UT - ground received), run and tracking station number, differential range delay in range units (RU), and total or columnar electron content (TEC) in units of "hexems" (10**16 e/sq-mt). Accuracy of the range measurement is of order 50 RU. Further details of the data processing are given in the SCE_DS_C4.TXT documentation file and the references therein. Details on the SCE Experiment are available in Bird, M. K., et al., "The Coronal Sounding Experiment," Astron. and Astrophys. Supp. Ser., 92(2), 425-430, 1992.

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