Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsh33a1830v&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SH33A-1830
Astronomy and Astrophysics
Astrophysics
[7514] Solar Physics, Astrophysics, And Astronomy / Energetic Particles
Scientific paper
We report on observations of heavy nuclei composition in Solar Energetic Particle (SEP) events which have associated Ground Level Events (GLEs) and measured CME speeds close to the sun. The heavy nuclei measurements are predominantly from the Solar Isotope Spectrometer (SIS) on-board the Advanced Composition Explorer (ACE) spacecraft and the CME speeds are predominantly from the LASCO C2 coronagraph on the SoHO spacecraft. It appears that the Fe/O ratio decreases with increasing CME speed, approaching the coronal value of ~0.13 at the highest CME speeds. A possible model for this is that the observed Fe and O consist of two components: one component, with a relatively high Fe/O ratio, is accelerated by the associated solar flare and the other component is coronal material (Fe/O ~ 0.13) accelerated by the associated CME-driven shock. The second component would be more important for events with very high CME speeds, resulting in a lowered combined Fe/O ratio.
Cane Hilary V.
Richardson Ian G.
von Rosenvinge Tycho T.
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