Physics
Scientific paper
Aug 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc....8.3149l&link_type=abstract
Proceedings of the 27th International Cosmic Ray Conference. 07-15 August, 2001. Hamburg, Germany. Under the auspices of the Int
Physics
4
Scientific paper
Measurements of ionic charge states in solar energetic particle (SEP) events have been made at relatively high energies (> 15 MeV/nucleon) with the Mass Spectrometer Telescope (MAST) on board the Solar, Anomalous, and Magnetospheric Particle Explorer (SAMPEX) satellite using the Earth's magnetic field as a particle rigidity filter. We have examined the largest SEP events of solar cycle 23 and determined ionic charge states of Fe and other elements in several of these events. The mean charge state of Fe is often considerably higher (˜ 20) in impulsive SEP events than in gradual events (˜ 15). Surprisingly, in several cases, relatively high charge states of around 20 were found for Fe in very large events which are most likely gradual. Further, our measurements also show that Si in these events is not necessarily in thermal equilibrium with other elements.
Cummings Alan C.
Labrador Allan Wayne
Leske Richard A.
Mewaldt Richard A.
Stone Edward C.
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