Computer Science
Scientific paper
Sep 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aipc..679..685w&link_type=abstract
SOLAR WIND TEN: Proceedings of the Tenth International Solar Wind Conference. AIP Conference Proceedings, Volume 679, pp. 685-6
Computer Science
3
Particle Emission, Solar Wind, Solar Wind Plasma, Sources Of Solar Wind
Scientific paper
We present a study of the elemental composition of a sub-set of coronal mass ejections, namely events which have been identified of being of the magnetic cloud type (MC). We used plasma density data from the MTOF sensor of the CELIAS instrument of the SOHO mission and plasma ionization data from the SWICS instrument of the ACE mission. So far we have investigated MCs of 1997 and 1998. The study covers the proton and heavy ion elemental abundances. Considerable variations from event to event exist with regard to the density of the individual species with respect to regular ``slow'' solar wind preceding the MC plasma. However, two general features are observed. First, we observe for the heavy elements (carbon through iron), which can be regarded as tracers in the solar wind plasma, a mass-dependent enrichment of ions monotonically increasing with mass. The enrichment can be explained by a previously published theoretical model assuming coronal plasma loops on the solar surface being the precursor structure of the MC. Second, when comparing the MC plasma to regular solar wind composition preceding the event, a net depletion of the lighter ions is always observed. Proton and alpha particle abundances have to be regarded separately since they represent the main plasma.
Bochsler Peter
Galvin Antoinette B.
Gloeckler George
Ipavich Fred M.
Paquette John A.
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