Study of solar activity in the past with the aid of cosmogenic isotopes

Details Study of solar activity in the past with the aid of cosmogenic isotopes Study of solar activity in the past with the aid of cosmogenic isotopes

Feb 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977izssr..41q.383p&link_type=abstract

(Mezhdunarodnyi Seminar po Aktivnym Protsessam na Solntse i Probleme Solnechnykh Neitrino, 8th, Leningrad, USSR, Sept. 25-27, 19

Computer Science

Cosmic Rays, Lunar Rocks, Radioactive Isotopes, Solar Cycles, Aluminum Isotopes, Lunar Soil, Manganese Isotopes, Proton Flux Density, Radiative Lifetime, Sodium Isotopes, Solar Activity, Solar Flares, Solar Protons

Scientific paper

The possibility is considered of using cosmogenic isotopes in lunar rock and soil samples as a means for studying solar activity in the past. Theoretical and experimental data on the concentrations of the short-lived cosmogenic isotopes Mn-54 and Na-22 as well as the long-lived isotopes Al-26 and Mn-53 in various Apollo and Luna samples are compared, and formation rates are computed for these isotopes. Good agreement between experimental and theoretical values is found only for the short-lived isotopes. Possible causes of the poor agreement for the long-lived isotopes are considered, including variations in past solar flare activity, lunar rock erosion, and the exclusive action of medium-energy galactic cosmic rays. The long-term solar proton flux is estimated to be 100 protons/sq cm per sec with a characteristic rigidity of 100 MV, but it is concluded that the results obtained do not allow definitive conclusions to be made about possible variations in cosmic-ray intensity 3 million yrs ago.

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