Lessons from Sequences of SEP Heavy Ion Events Associated with Active Region Passages Across the Disk

Details Lessons from Sequences of SEP Heavy Ion Events Associated with Active Region Passages Across the Disk Lessons from Sequences of SEP Heavy Ion Events Associated with Active Region Passages Across the Disk

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsh21b0428c&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SH21B-0428

Physics

2111 Ejecta, Driver Gases, And Magnetic Clouds, 2118 Energetic Particles, Solar, 2139 Interplanetary Shocks

Scientific paper

The origin and heliospheric transport of SEP heavy ions are important areas for study due to both the hazards to humans and technologies these ions represent, as well as the information they contain about the processes of particle acceleration by the Sun. It has been suggested that compositional differences which depend on solar event longitude are associated with the particular geometry of the observer's connection to the CME-related shock. To learn more about this hypothesis, we analyze a number of significant heavy ion SEP events that occur in sequences of three as a CME-productive active region makes its way across the disk from east to center to west limb. For this purpose we use the SIS data from ACE, including ions above 5 MeV/n and masses up to and including Fe. We report on trends in the relative fluxes of heavy species that suggest altitude of connection rather than longitude of connection effects.

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