BRIEF DESCRIPTION Galactic and Solar Cosmic Rays (Principal Investigator: Trainor) HELIOS-A and -B spacecrafts were the pair of deep space probes developed by the Federal Republic of Germany (FRG) in a cooperative program with NASA. The purpose of the mission was to make pioneering measurments of the interplanetary medium from the vicinity of the earth's orbit to 0.3 AU. The detector complement of this experiment (E7) consisted of three separate dE/dx vs E telescopes and a proportional counter for monitoring solar X rays in the range 2-8 keV. The high-energy telescope had a geometric factor of 0.22 sq cm-sr and measured electrons in three ranges between 2 and 8 MeV, and protons and alpha particles in three ranges between 20 and 56 MeV/n. Protons above 230 MeV were also measured. The first low-energy telescope (geometric factor was 0.155 sq cm-sr) measured protons and Z>1 particles in three ranges between 3 and 21 MeV/n. The second low-energy telescope (geometric factor was 0.015 sq cm-sr) measured protons in several ranges between 0.12 and 2.1 MeV, alpha particles in the ranges 0.6-2.1 and 6-21.2 MeV/n, and electrons in four ranges between 0.12 and 2 MeV. For a number of coincidence modes, counting-rate data sectored into eight 45-deg sectors were obtained. The data cycle time was dependent on the spacecraft telemetry rate (variable between 4096 and 8 bits/s) and format. Under optimum conditions, five events per second were pulse-height analyzed and the rate data cycle was of the order of 5 min. At the slowest combination of bit rate and format, a complete data cycle required about 2.5 h. See IEEE Trans. on Nuc. Sci., NS-22, p. 570, 1975, and Raumfahrtforschung, v. 19, n. 5, pp. 258-260, 1975, for further details. The h-a-pf.dat and h-b-pf.dat files contains hourly averaged proton flux data written in ASCII-codes. The fixed length data records each contain one hour worth of data. Each item contains a count of the number of hourly intervals in the record; time in year,month, day of month, h, m and s; values of proton fluxes in energy bins from 3.3 to 21.6 MeV, 21.6 to 57.0 MeV, and above 57.0 MeV; and ststistical errors associated with the fluxes. For h-a-pf.dat file: Time Coverage: 1974/12/15 - 1984/02/12 For h-b-pf.dat file: Time Coverage: 1976/01/18 - 1980/03/07 Format Description: WORD ASCII MEANING UNITS/COMMENTS 1 I2 YEAR (e.g., 74,75,76,...) 2 I3 MONTH (e.g., January = 1, February=2, ...) 3 I3 DAY (e.g., 1,2....31) 4 I3 HOUR (0,1,...23) 5 I3 MINUTE 0 6 I3 SECOND 0 7 F13.3 CHANNEL 1 Values of proton flux in energy bin from 3.3 to 21.6 MeV. 8 F10.3 ERROR 1 Statistical error associated with the flux in Channel 1 9 F10.3 CHANNEL 2 Values of proton flux in energy bin from 21.6 to 57.0 MeV. 10 F10.3 ERROR 2 Statistical error associated with the flux in Channel 2 11 F10.3 CHANNEL 3 Values of proton flux in energy range above 57.0 MeV. 12 F10.3 ERROR 3 Statistical error associated with the flux in Channel 3 Note: 1. Negative rates indicate missing or invalid data. 2. for CHANNEL 1: geometry factor is 0.15 sq cm sr for CHANNEL 2: geometry factor is 0.27 sq cm sr for CHANNEL 3: geometry factor is 0.44 sq cm sr