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1) Helios 1 E1 (Rosenbauer) Hourly Plasma Data maxmize
Resource ID:spase://VSPO/NumericalData/Helios1/E1/PT1H
Start:1974-12-12 00:00:00 Observatory:Helios 1 Cadence:1 hour
Stop:1984-12-29 00:00:00 Instrument:Helios 1 E1 Plasma Experiment Resource:NumericalData
These hourly averaged solar wind plasma data from the E1 Plasma Detectors (Rosenbauer) onboard the Helios 1 spacecraft include time, earth-sun-Helios angle, sun-Helios distance (AU), Carrington longitude of Helios, solar-ecliptic latitude, Carrington rotation number, proton bulk speed, temperature, number density, flow angles of ecliptic elevation and azimuth, standard deviations of the plasma parameters, and the number of data points in the hourly averages.

2) Helios 1 40.5-sec Combined Magnetic Field and Plasma Data maxmize
Resource ID:spase://VSPO/NumericalData/Helios1/E1/PT40.5S
Start:1974-12-12 00:00:00 Observatory:Helios 1 Cadence:40.5 seconds
Stop:1985-09-04 00:00:00 Instrument:Helios 1 E1 Plasma Experiment Resource:NumericalData
Helios 1 40-second merged magnetic field and plasma data

3) Helios 1 E2 Hourly Magnetic Field Data maxmize
Resource ID:spase://VSPO/NumericalData/Helios1/E2/PT1H
Start:1974-12-10 00:00:00 Observatory:Helios 1 Cadence:1 hour
Stop:1976-04-30 00:00:00 Instrument:Fluxgate Magnetometer for Field Fluctuations Resource:NumericalData
This data set contains hour-averaged magnetic field vectors from the Neubauer/Maier experiment on Helios 1. It provides 1-hr average values of the solar ecliptic X, Y, Z components of the magnetic field, in units of centi-gamma. Also available are the number of samples of each component used in the averaging. The location of the spacecraft is specified in terms of ecliptic longitude, heliographic latitude, and radial distance from sun. Data quality flags are also included.

4) Helios 1 E3 Hourly Magnetic Field Data maxmize
Resource ID:spase://VSPO/NumericalData/Helios1/E3/PT1H
Start:1974-12-15 00:00:00 Observatory:Helios 1 Cadence:1 hour
Stop:1978-12-29 00:00:00 Instrument:Fluxgate Magnetometer for Average Fields Resource:NumericalData
This data set contains hour-averaged magnetic field vectors from the Ness/Mariani experiment on Helios 1. Each record contains time, magnetic field intensity and cartesian components in spacecraft-centered solar ecliptic coordinates, standard deviations, numbers of fine-scale points in the average, and an instrument mode indicator. It should be noted that the "average" mode, which was used a minority of the time and involved on-board averaging, may have incorrectly handled range changes caused by occasional significant changes in ambient field intensity. The data set had not been filtered for this effect upon delivery to NSSDC.

5) Helios 1 6-sec magnetic field data maxmize
Resource ID:spase://VSPO/NumericalData/Helios1/E3/PT6.00S
Start:1974-12-15 00:00:00 Observatory:Helios 1 Cadence:6.00 seconds
Stop:1978-12-29 00:00:00 Instrument:Fluxgate Magnetometer for Average Fields Resource:NumericalData
Helios 1 6-sec magnetic field averages from Mariani/Ness experiment

6) Helios 1 Magnetic Field Spectral Density, offline at NSSDC maxmize
Resource ID:spase://VSPO/NumericalData/Helios1/E4/PT8S
Start:1974-12-10 00:00:00 Observatory:Helios 1 Cadence:8 seconds
Stop:1975-09-20 00:00:00 Instrument:Search Coil Magnetometer Resource:NumericalData
This data set contains 8-sec averaged and peak spectral densities of magnetic field component variations in 8 spectral bands with center frequencies logarithmically equispaced between 6.8 Hz and 1470 Hz. Data records also contain time, spacecraft position, spacecraft-sun-Earth angle, spin vector direction, data quality flags, etc.

7) Helios 1 E6 (Kunow) Hourly Particle Fluxes maxmize
Resource ID:spase://VEPO/NumericalData/Helios1/E6/PT1H
Start:1974-12-11 00:00:00 Observatory:Helios 1 Cadence:1 hour
Stop:1983-12-31 00:00:00 Instrument:Cosmic Ray Particles Resource:NumericalData
Data set records contain fluxes of protons in 5 energy ranges (4-13, 13-27, 27-37, 37-51, >51 MeV), alpha particles in 6 energy ranges (2-4, 4-13, 13-27, 27-37, 37-48, >48 MeV/n), and electrons in 2 ranges (0.3-0.8, 0.8-2.0 MeV). The fluxes are averaged over intervals of approximately one hour. Each "data record" (having ending CR and/or LF) spans 4-5 hours and has 10 time-overlapping segments. Each segment has averaging start and stop times plus words for 13 fluxes and words for the statistical uncertainties in the 13 fluxes. However, most words in a given segment have fill values, such that good values for a given flux (species and energy range) and its uncertainty appear only in a minority of the segments. No spacecraft position information is included. Data are from the E6 experiment on Helios 1.

8) Helios 1 E7 (Trainor) Hourly Particle Data maxmize
Resource ID:spase://VSPO/NumericalData/Helios1/E7/PT1H
Start:1974-12-15 00:00:00 Observatory:Helios 1 Cadence:1 hour
Stop:1984-02-12 00:00:00 Instrument:Galactic and Solar Cosmic Rays Resource:NumericalData
This data set contains hourly averaged fluxes of protons measured by the GSFC Galactic and Solar Cosmic Ray experiment on Helios 1. The fixed length ASCII records have been reformatted from the binary format of the originally submitted data set (NSSDC ID 74-097A-08B). Each record contains the date and time in year, month, day, hour, minute, and second. The flux values and statistical errors are included for proton energy ranges of 3.3 - 21.6 MeV, 21.6 - 57 MeV, and above 57 MeV.

9) Helios 1 E7 (Trainor) 30-min fluxes and rates maxmize
Resource ID:spase://VEPO/NumericalData/Helios1/E7/PT30M
Start:1974-12-16 00:00:00 Observatory:Helios 1 Cadence:30 minutes
Stop:1982-12-31 00:00:00 Instrument:Galactic and Solar Cosmic Rays Resource:NumericalData
This data set, created in 2010 by Nand Lal, contains 30-min resolution fluxes and count rates of energetic protons, alpha particles, electrons and X-rays from the E7 experiment (P.I.: J. Trainor, GSFC) flown on the Helios 1 spacecraft. Accompanying each flux and count rate is a statistical uncertainty of the flux or rate. The data are spin-averaged. The data are in 920-character ASCII records and consist of: A. Proton fluxes based on pulse height and rate data in 7 energy windows, 3.40-6.05, 6.05-11.10, 11.10-21.60, 24.52-28.82, 32.00-46.30, 45.30-57.22, 135.2-206.5 MeV. B. Alpha particle fluxes based on pulse heights and count rates in 6 energy windows, 3.20-4.98, 4.98-11.50, 11.50-21.60, 24.51-31.12, 31.12-45.53, 45.53-57.53 MeV/n. C. Combined proton plus alpha particle fluxes based on LET1 and HET count rates in 6 energy windows, 3-6, 6-11, 11-21, 20-30, 32-45, 45-56 MeV/n. D. Alpha particle fluxes based on HET count rates in three energy windows, 20-30, 32-45, 45-57 MeV/n. E. Two count rates primarily due to electrons at 2-4 and 4-8 MeV. F. 21 additional count rates corresponding to individual telescope sensors or sensor combinations. For one sensor, rates at each of several discrimination levels are given). These rates are further discussed in the documentation and in the references provided. A subset of the above parameters (A, B, E) are available with graphical display at the OMNIWeb-Plus interface identified below

10) Helios 1 E8 (Keppler) Hourly Particle Fluxes maxmize
Resource ID:spase://VEPO/NumericalData/Helios1/E8/PT1H
Start:1974-12-10 00:00:00 Observatory:Helios 1 Cadence:1 hour
Stop:1980-12-31 00:00:00 Instrument:Energetic Electron and Proton Detector Resource:NumericalData
Data set records contain hourly count rates of protons and electrons in 16 energy ranges (protons: 15 differential channels between 21 and 677 keV, plus >677 keV; electrons: 15 differential channels between 17 and 835 keV, plus >835 keV), each in 16 22.5 deg azimuthal sectors. Accumulation times for each count rate are also given. No spacecraft position information is included. Data are from the E8 experiment on Helios 1.

11) Helios 1 Hourly Trajectory Data maxmize
Resource ID:spase://VSPO/NumericalData/Helios1/Ephemeris/PT1H
Start:1974-12-10 00:00:00 Observatory:Helios 1 Cadence:1 hour
Stop:1981-09-30 00:00:00 Instrument:Helios 1 Position Resource:NumericalData
This directory includes hourly heliocentric coordinate data for the Helios 1 spacecraft as extracted into the ASCII files HE1TRJyy.asc (yy is the two-digit year) from the merged solar wind magnetic and plasma data set in HELIOS_1/MGD_FREEMAN. All trajectory parameters except solar ecliptic and heliographic inertial coordinates were taken from the original merged dataset. The other parameters were computed and added using the code HELTRJCON in the MGD_FREEMAN directory. Source routines for coordinate conversions in this code were provided by R. Parthasarathy of the Satellite Situation Center at NSSDC. The code READHEL in MGD_FREEMAN was used to read the archived datasets into an intermediate format for input to HELTRJCON. Code HELTRJCN1 was used to correct the solar ecliptic angles as of 6/14/94 (see Note 2 above). HELTRJCON was also corrected as of this date. Data Parameter Description: NY - YEAR OF THE DATA INTERVAL (LAST TWO DIGITS ONLY). ND - DAY OF THE DATA INTERVAL FROM THE FIRST DAY OF THE ABOVE YEAR, JAN. 1= DAY 1. NH - HOUR OF THE DAY OF THE DATA INTERVAL. NCARROT - CARRINGTON ROTATION NUMBER AS SEEN BY AN EARTH BASED OBSERVER AT THE START OF THE DATA INTERVAL. SPAU - SPACECRAFT HELIOCENTRIC DISTANCE IN ASTRONOMICAL UNITS. SECLAT - SOLAR ECLIPTIC LATITUDE IN DEGREES SECLON - SOLAR ECLIPTIC LONGITUDE IN DEGREES HELLAT - SOLAR HELIOGRAPHIC LATITUDE IN DEGREES HELLON - SOLAR HELIOGRAPHIC (CARRINGTON) LONGITUDE IN DEGREES HILLON - SOLAR HELIOGRAPHIC INERTIAL LONGITUDE IN DEGREES WITH RESPECT TO ASCENDING NODE OF SOLAR EQUATOR ON THE ECLIPTIC ESSCSANG - EARTH-SUN-SPACECRAFT SEPARATION ANGLE (IN DEGREES, 0-360). ICODE - DATA CODE: 1 MEANS PLASMA DATA ONLY ARE PRESENT FOR THAT HOURLY INTERVAL; 2 MEANS MAGNETOMETER DATA ONLY; 3 MEANS BOTH PLASMA AND MAGNETOMETER DATA PRESENT. Note 1: The solar ecliptic coordinates are given with respect to true equinox and ecliptic of date. The solar ascending node was located at ecliptic longitude +74.367 degrees as of 1 Jan. 1900 at 1200 UT; this longitude increases by 1.4 degrees/century. Note 2: The solar ecliptic cordinates in this directory before 6/14/94 were calculated incorrectly and have been corrected as of this date. The heliographic angles are from the original source dataset and had no problems.

12) Helios 1 Daily Trajectory Data maxmize
Resource ID:spase://VSPO/NumericalData/Helios1/Ephemeris/PT24H
Start:1974-12-10 00:00:00 Observatory:Helios 1 Cadence:24 hours
Stop:1981-09-30 00:00:00 Instrument:Helios 1 Position Resource:NumericalData
This data set contains orbital parameters for Helios 1: Helios-Sun distance, heliographic longitude from the ascending node, heliographic latitude, ecliptical longitude from the mean equinox, ecliptical longitude from the Earth-Sun line, ecliptical latitude, Helios - Earth distance, and number of rotations of the Sun referred to Helios since launch.

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