Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988ap%26ss.144..337l&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 144, no. 1-2, May 1988, p. 337-346.
Astronomy and Astrophysics
Astrophysics
1
Interplanetary Medium, Lunar Surface, Proton Energy, Solar Cosmic Rays, Solar Flares, Particle Acceleration, Secular Variations, Solar Cycles, Solar System
Scientific paper
The author discusses the present day information on the prehistoric proton radiation in the solar system at 1 AU based on activation of lunar surface materials, in relation to our present day knowledge of their contemporary fluxes in solar flare events and during quiet time. The bulk of the prehistoric radiation can be attributed to its origin in solar flares. Its energy spectrum is, however, harder than the solar flare radiation observed during solar cycles 19, 20, and 21 (1954 - 1986). The implications of the data to other sources of particles and/or acceleration mechanisms in the interplanetary region are discussed.
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