The 1964-1972 quiet-time spectra of protons and helium at 2-20 MeV per nucleon

Details The 1964-1972 quiet-time spectra of protons and helium at 2-20 MeV per nucleon The 1964-1972 quiet-time spectra of protons and helium at 2-20 MeV per nucleon

May 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...197..767z&link_type=abstract

Astrophysical Journal, vol. 197, May 1, 1975, pt. 1, p. 767-780.

Astronomy and Astrophysics

Astrophysics

6

Alpha Particles, Cosmic Rays, Energy Spectra, Interplanetary Medium, Proton Flux Density, Solar Corpuscular Radiation, Explorer Satellites, Galactic Radiation, Solar Activity, Solar Cosmic Rays, Solar Protons, Spectrum Analysis

Scientific paper

Instruments on the IMP 4 and 5 satellites are used to observe quiet-time proton and helium fluxes in the energy range from 2 to 30 MeV/nucleon and to extend the total observation period through the solar maximum to about the solar minimum (1964-1972). The nature of quiet time at low energies is discussed, selection of quiet-time periods is described, and data are presented on the fluxes during recovery from the solar maximum. The long-term time-dependence of the proton and helium spectra over solar cycle 20 is determined. The fluxes are found to vary by a factor of approximately 7, the variation is shown to be similar to the modulation of medium-energy cosmic rays, and the observed relative abundance of protons and helium is found to be closer to the medium-energy galactic rather than the average solar-flare relative abundance. A galactic origin is suggested for the low-energy quiet-time turnup, although a solar or heliospheric acceleration mechanism is not ruled out.

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