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Phillips et al. 2001

Phillips, G.W., Share, G.H., King, S.E., August, R.A., Tylka, A.J., Adams, J.H., Panasyuk, M.I., Nymmik, R.A., Kuzhevskij, B.M., Kulikauskas, V.S., Zhuravlev, D.A., Smith, A.R., Hurley, D.L. and McDonald, R.J. (2001). Correlation of upper-atmospheric ⁷Be with solar energetic particle events. Geophysical Research Letters 28: doi: 10.1029/2000GL012518. issn: 0094-8276.

A surprisingly large concentration of radioactive 7Be 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 7Be concentrations in low earth orbit. Our data show a significant correlation between the 7Be 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 7Be in the ionosphere. ¿ 2001 American Geophysical Union

BACKGROUND DATA FILES

	Abstract

Keywords
Interplanetary Physics, Cosmic rays, Interplanetary Physics, Energetic particles, solar, Ionosphere, Solar radiation and cosmic ray effects

Journal
Geophysical Research Letters
http://www.agu.org/journals/gl/

Publisher
American Geophysical Union
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