Physics
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....7.4273y&link_type=abstract
Proceedings of the 28th International Cosmic Ray Conference. July 31-August 7, 2003. Trukuba, Japan. Under the auspices of the I
Physics
Scientific paper
Galactic cosmic rays (GCR) produce 7 Be radioactive nuclei from nuclear interactions with the atmospheric N and O nuclei. In addition, extraordinarily intense solar energetic particles (SEP) associated with a great coronal mass ejection (CME) event contribute to production of 7 Be nuclei, though a frequency of such solar proton event is very low and its duration is less than a few days. The SEP proton spectrum is so steep that most of 7 Be is produced in a thin top layer of the polar atmosphere. We calculate the global average 7 Be production rate in the upper atmosphere taking account both GCR and SEP protons. The production rate of 7 Be by the intense SEP event increases about a few tens times that by GCR. We compare the present calculation with the measurement of 7 Be and discuss the SEP effect to 7 Be production.
Hirayama Hideo
Mori Satoru
Yoshimori Masato
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