High Energy Ionic Charge State Measurements from Recent Solar Energetic Particle Events of 2000-2001

Details High Energy Ionic Charge State Measurements from Recent Solar Energetic Particle Events of 2000-2001 High Energy Ionic Charge State Measurements from Recent Solar Energetic Particle Events of 2000-2001

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsh12c..05l&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SH12C-05

Other

2118 Energetic Particles, Solar, 7514 Energetic Particles (2114)

Scientific paper

The ionic charge states of solar energetic particles (SEPs) provide information on the temperature of the source region and on conditions of acceleration and transport during which additional electron stripping may occur. Measurements of SEP charge states at relatively high energies (>15 MeV/nucleon) have been made using the Mass Spectrometer Telescope (MAST) on board the Solar, Anomalous, and Magnetospheric Particle Explorer (SAMPEX) satellite with the geomagnetic rigidity filter technique. We have measured the geomagnetic cutoff latitudes in recent SEP events from July 2000 and March and April 2001 (see Leske et al., this meeting), and we present ionic charge states derived from these measurements in combination with our charge state measurements for other large SEP events from solar cycle 23. We find some relatively high Fe charge states of around 20 for events which are most likely gradual, and we find that higher Fe charge states correlate with higher Fe/O abundance ratios. This work is supported in part by NASA under contract NAS5-30704 and grant NAGW-1919.

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