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Correlation of upper‐atmospheric <sup>7</sup>Be with solar energetic particle events

Gary W. PhillipsNaval Research Laboratory, Washington, DC, USAG. H. ShareNaval Research Laboratory, Washington, DC, USAS.E. KingNaval Research Laboratory, Washington, DC, USAR.A. AugustNaval Research Laboratory, Washington, DC, USAA. J. TylkaNaval Research Laboratory, Washington, DC, USAJenni AdamsNaval Research Laboratory, Washington, DC, USAM. I. PanasyukSkobeltsyn Institute of Nuclear Physics, Moscow State University, Moscow, RussiaР. А. НыммикSkobeltsyn Institute of Nuclear Physics, Moscow State University, Moscow, RussiaB. M. KuzhevskijSkobeltsyn Institute of Nuclear Physics, Moscow State University, Moscow, RussiaВ. С. КуликаускасSkobeltsyn Institute of Nuclear Physics, Moscow State University, Moscow, RussiaD. A. ZhuravlevSkobeltsyn Institute of Nuclear Physics, Moscow State University, Moscow, RussiaA. R. SmithLawrence Berkeley National Laboratory, Berkeley, CA, USADonna HurleyLawrence Berkeley National Laboratory, Berkeley, CA, USAR. J. McDonaldLawrence Berkeley National Laboratory, Berkeley, CA, USA

2001en

ABI

Annotatsiya

A surprisingly large concentration of radioactive 7 Be was observed in the upper atmosphere at altitudes above 320 km on the LDEF satellite that was recovered in January 1990. We report on follow‐up experiments on Russian spacecraft at altitudes of 167 to 370 km during the period of 1996 to 1999, specifically designed to measure 7 Be concentrations in low earth orbit. Our data show a significant correlation between the 7 Be concentration and the solar energetic proton fluence at Earth, but not with the overall solar activity. During periods of low solar proton fluence, the concentration is correlated with the galactic cosmic ray fluence. This indicates that spallation of atmospheric N by both solar energetic particles and cosmic rays is the primary source of 7 Be in the ionosphere.

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DOI: 10.1029/2000gl012518

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