Other
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm31b1115l&link_type=abstract
American Geophysical Union, Fall Meeting 2003, abstract #SM31B-1115
Other
0399 General Or Miscellaneous, 2799 General Or Miscellaneous, 7513 Coronal Mass Ejections, 7514 Energetic Particles (2114)
Scientific paper
During large solar energetic particle (SEP) events, charged particles can ionize the atmosphere and alter atmospheric chemistry. Geomagnetic cutoff latitudes bound the polar regions of the atmosphere exposed to solar particles. The size of the exposed polar regions may change significantly during SEP events, correlating well with geomagnetic activity. During SEP events, the geomagnetic cutoff latitude can vary by more than 10 degrees. Using data from the MAST instrument on SAMPEX, we have measured geomagnetic cutoffs for 17 large SEP events, including the 4/21/02 event. We will combine these measurements with data from other SAMPEX instruments to investigate how the size of the polar regions depends on particle rigidity, how this dependence may change with time during an event, and how the measurements compare with models.
Kanekal S.
Klecker Berndt
Labrador Allan Wayne
Leske Richard
Looper Mark
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