GEOPHYSICAL RESEARCH LETTERS, 33, L01102, doi:10.1029/2005GL024661, 2006

The importance of atmospheric precipitation in storm-time relativistic electron flux drop outs

M. A. Clilverd1, C. J. Rodger2, Th.Ulich3

1British Antarctic Survey (NERC), Cambridge, U.K.,
2Dept. of Physics, University of Otago, Dunedin, New Zealand,
3Sodankylä Geophysical Observatory, Sodankylä, Finland.


During the sudden decrease of geosynchronous electron flux (>2 MeV) of 17:10–17:20 UT, January 21, 2005 large-scale precipitation into the atmosphere was observed. Estimates from ground-based radio propagation experiments at L≈5 in the Northern and Southern hemispheres suggest that the atmospheric precipitation was less than 1/10 of the flux apparently lost during this 10 minute period. However, continuing precipitation losses from 4<L<6, observed for the next 2.7 hours, provides about 1/2 of the total relativistic electron content lost.

© 2006 by the American Geophysical Union. Further electronic publication not allowed.

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