Temperatures, Densities and Ionization States of CMEs from UVCS

Details Temperatures, Densities and Ionization States of CMEs from UVCS Temperatures, Densities and Ionization States of CMEs from UVCS

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sh42a06r&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SH42A-06 INVITED

Physics

7513 Coronal Mass Ejections, 7549 Ultraviolet Emissions

Scientific paper

UV spectra of CMEs from SOHO/UVCS show ions ranging from H I and C II up to Fe XVIII. The ionization state is low in the densest, brightest regions. In some cases the gas cannot have been very hot during the initial mass ejection, because it could not have recombined quickly enough to form the low ionization species observed. We consider the implications for heating of the coronal gas and we discuss possible explanations for the rarity of high ionization gas in UVCS spectra compared with its prevalence in CMEs in the solar wind.

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