Physics
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsh43c..07g&link_type=abstract
American Geophysical Union, Spring Meeting 2008, abstract #SH43C-07
Physics
7514 Energetic Particles (2114), 7519 Flares, 7594 Instruments And Techniques, 7859 Transport Processes
Scientific paper
The ionic charge states of Solar Energetic Particle (SEP) events provide information both about the plasma environment of the flare site and the propagation process of the energetic particles. We have performed a survey of the charge state behavior for impulsive flare-related SEP events with ACE SEPICA from 1998 through 2000. This event set has been selected by eliminating all CME and shock-related events, out of which two thirds showed a short time injection with recognizable energy dispersion, an independent sign for impulsive events. However, all events in this survey also showed a strong energy dependence of the ionic charge state of heavy ions, most pronounced for iron. Based on the finding that this energy dependence is very similar for all events with and without obvious injection, we then expanded the database to all events with a charge state increase for iron by at least 2.5 units, within the energy range from 0.06 to 0.54 Mev/nuc. For the combined set of 34 impulsive events we find that the source temperature is constrained by the lowest energy charge state to 1-3 million K. In combination with models on interplanetary propagation, including scattering, convection and adiabatic deceleration, a systematic study of the observed Fe charge state behavior is consistent with a range of mean free path lengths of 0.1 - 1 AU for these energetic particles. Further implications on the propagation and acceleration conditions are discussed.
Difabio R.
Droege Wolfgang
Guo Zhi
Kartavykh J. J.
Klecker Berndt
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