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1) Alouette 2 electron density data maxmize
Resource ID:spase://VSPO/NumericalData/Alouette2/CEP/PT60S
Start:1966-02-21 00:00:00 Observatory:Alouette 2 Cadence:60 seconds
Stop:1967-02-16 00:00:00 Instrument:Cylindrical Electrostatic Probes Resource:NumericalData
Alouette 2 ionospheric electron density data at 1-5 min resolution

2) Alouette 2 1-min Position Data maxmize
Resource ID:spase://VSPO/NumericalData/Alouette2/Ephemeris/PT1M
Start:1966-01-27 00:00:00 Observatory:Alouette 2 Cadence:1 minute
Stop:1975-07-31 00:00:00 Instrument:Alouette2 Positions Resource:NumericalData
Alouette-2 satellite position and magnetic field model information.

3) 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).

4) 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.

5) 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.

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