Determination of ~2 MA Average Flux and Rigidity for Energetic Solar Protons from Lunar Rock 61016

Details Determination of ~2 MA Average Flux and Rigidity for Energetic Solar Protons from Lunar Rock 61016 Determination of ~2 MA Average Flux and Rigidity for Energetic Solar Protons from Lunar Rock 61016

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27..395g&link_type=abstract

Lunar and Planetary Science, volume 27, page 395

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Argon: Cosmogenic, Exposure Age, Neon: Cosmogenic, Solar Proton Flux, Solar Proton Rigidity

Scientific paper

Earlier NASA spacecraft measured real-time characteristics of energetic solar protons and found the flux and some other parameters to vary widely. The only way to determine some long-term, average characteristics of solar protons is by measurement of their nuclear interaction products as a function of depth within the very few lunar rocks that have oriented geometries and simple exposure histories. Most previous studies utilized radionuclides such as 26Al, 53Mn, 14C. etc. We developed techniques to measure SCR (i.e., solar-proton-produced) 21Ne, 22Ne, and 38Ar, and in lunar rocks 68815 and 61016 we reported average values for the flux and rigidity (i.e., particle energy distribution) for solar protons of >10 MeV over the past 2 Ma. However, our initial work on rock 61016 included a limited number of samples and a less sophisticated method of deriving solar proton characteristics. Recently we measured SCR Ne and Ar in additional depth samples of 61016, using procedures previously reported. Duplicate data sets between three measurement series were taken for four depths, and these values were averaged to normalize all of the data. Here we report more precise results for proton flux and rigidity determined from all our analyses of 61016.

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