Physics
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sh61b09m&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SH61B-09
Physics
2118 Energetic Particles, Solar, 2164 Solar Wind Plasma, 7514 Energetic Particles (2114)
Scientific paper
In the current picture of gradual solar energetic particle (SEP) events, the bulk of the acceleration is believed to take place at a shock driven by a coronal mass ejection (CME) as it moves through the corona and out into the solar wind. It is often assumed that the particles that are accelerated and later observed at 1 AU represent an accelerated sample of solar wind. We compare SEP composition measurements from a variety of spacecraft with recent measurements of the solar wind composition, focusing in particular on a comparison of the fractionation patterns with respect to first ionization potential (FIP). On the basis of several significant differences between the solar wind and SEP compositions, we conclude that most solar energetic particles with energies >3 MeV/nucleon are not simply an accelerated sample of the solar wind; rather, solar energetic particles and fast and slow solar wind appear to be distinct samples of coronal material with significantly different FIP-fractionation patterns. This implies that these SEPs must be accelerated within a few solar radii of the Sun.
Christian Eric R.
Cohen Charon
Cummings Alan C.
Leske Richard A.
Mewaldt Richard A.
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