Solar Cycle Variations of Fe-rich SEP Events

Details Solar Cycle Variations of Fe-rich SEP Events Solar Cycle Variations of Fe-rich SEP Events

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsh41b..04c&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SH41B-04

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2114 Energetic Particles (7514), 2139 Interplanetary Shocks, 7519 Flares

Scientific paper

An investigation of the characteristics of large solar energetic particle (SEP) events with >25 MeV/nuc event- -averaged Fe/O above 0.5 shows that such events have a rapid rise to maximum intensity and little evidence of particle acceleration at the passage of an interplanetary shock in this energy range. We explore the reasons why such events were not seen by near--Earth spacecraft in 2004 and 2005. One reason, that we have already documented, is that fast shocks (transit speeds above 1000 km/s) are relatively more common after solar maximum. The disappearance of Fe--rich events late in Cycle 23 has been used by Tylka et al. (2006) to argue for the absence of flare particles both as seed particles for shocks and as direct contributors to large SEP events. However, such arguments ignore the fact that there were no events with the other characteristics of Fe-rich events.

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