Elemental Abundance Variations of Gradual SEP Events at Low Energies as Measured by ACE/ULEIS and WIND/STEP Over the Last Solar Cycle

Details Elemental Abundance Variations of Gradual SEP Events at Low Energies as Measured by ACE/ULEIS and WIND/STEP Over the Last Solar Cycle Elemental Abundance Variations of Gradual SEP Events at Low Energies as Measured by ACE/ULEIS and WIND/STEP Over the Last Solar Cycle

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsh31a1156a&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SH31A-1156

Physics

7514 Energetic Particles (2114), 7536 Solar Activity Cycle (2162), 2114 Energetic Particles, Heliospheric (7514), 2118 Energetic Particles, Solar, 2162 Solar Cycle Variations (7536)

Scientific paper

Solar energetic particles (SEPs) provide a measuring technique to probe the composition of the solar corona independent of spectroscopic measurements. However, SEP elemental abundances in large gradual events can vary considerably from event to event, exceeding one order of magnitude in some cases; this must be taken into account when using SEP measurements to deduce the coronal composition. The causes of these variations are unfortunately still not clear, and may be produced either by acceleration/transport effects or variations in the source abundances. Using the Ultra-Low-Energy-Isotope-Spectrometer (ULEIS) onboard the Advanced Composition Explorer (ACE) and the Supra-Thermal-through-Energetic-Particle (STEP) instruments onboard the WIND spacecraft, we have measured the fluxes of Fe and the C-N-O at energies between 0.02 and 0.6 MeV/nucleon and extracted the C to O ratios for a survey of gradual SEP events between 1995 and 2003. In this presentation, we will report on preliminary results of this study.

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