Composition of Interplanetary Coronal Mass Ejections at Very High Latitudes

Details Composition of Interplanetary Coronal Mass Ejections at Very High Latitudes Composition of Interplanetary Coronal Mass Ejections at Very High Latitudes

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsh33b..02v&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SH33B-02

Physics

7511 Coronal Holes, 7513 Coronal Mass Ejections, 2111 Ejecta, Driver Gases, And Magnetic Clouds, 2162 Solar Cycle Variations (7536), 2164 Solar Wind Plasma

Scientific paper

Composition signatures such as a high average iron charge state, a high O7+/O6+ ratio, or a high alpha to proton ratio are established tools for the identification of interplanetary coronal mass ejections (ICMEs). However, their relation to the classical signatures such as conterstreaming electrons, low plasma beta, or magnetic field rotation, is far from being one-to-one, and therefore deserves some attention. When Ulysses was traveling to high latitudes it encountered ICMEs both during the first set of polar passes at solar minimum and during the second set, which occurred around the maximum of solar cycle 23. Six high-latitude ICMEs had been observed in the large fast streams from the polar coronal holes at solar minimum, defining a new class of overexpanding ICMEs, but none had a compositional signature whatsoever. In this paper we analyze five ICME events that were also embedded in a polar fast stream, but occurred not far from solar maximum, in October to December 2001 at a heliolatitude of >70o north. These five events show a surprising variety of compositional signatures, from hardly any to strong. They are ideally suited for the study of these signatures since the background fast solar wind is compositionally uniform, making the boundaries appear very sharp. This enables us to compare the two sets of signatures to a high degree of accuracy.

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