Correlating CME Indicators in Genesis Solar Wind Data: Cross-Comparison of Low Proton Temperature, Helium Abundance Enhancements and the Presence of Counter-Streaming Electrons

Details Correlating CME Indicators in Genesis Solar Wind Data: Cross-Comparison of Low Proton Temperature, Helium Abundance Enhancements and the Presence of Counter-Streaming Electrons Correlating CME Indicators in Genesis Solar Wind Data: Cross-Comparison of Low Proton Temperature, Helium Abundance Enhancements and the Presence of Counter-Streaming Electrons

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsh21a0506b&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SH21A-0506

Physics

2164 Solar Wind Plasma, 7513 Coronal Mass Ejections

Scientific paper

The Genesis spacecraft, currently located at L1, has been making in-situ solar wind measurements since August 2001. For operational purposes, an autonomous onboard algorithm analyzes measurements taken by the plasma ion and electron spectrometers and determines whether the type of solar wind flow being encountered is of coronal hole, streamer belt or CME origin. To identify CME flows, the algorithm looks for three signatures that have previously been found to be useful CME indicators: helium abundance enhancement, lower-than-expected proton temperature, and the presence of counter-streaming suprathermal electrons. CMEs can typically exhibit one or more of these signatures, but it is unusual for any given CME interval to carry all three signatures simultaneously. For this study, we examine the degree to which these three CME indicators are coincident in the Genesis data. Some preliminary results are as follows. Alpha particle enhancements (where the number density ratio to protons is >8%) nearly always occur together with either counter-streaming electrons or depressed proton temperatures. However, the total time alpha particles are enhanced is usually much less than the amount of time counter-streaming electrons or temperature depressions are found. Counter-streaming electron intervals show a relatively poor correlation with depressed temperature intervals: the fraction of time counter-streaming electrons are found within intervals of depressed temperatures (30%) is only slightly higher than the fraction of time bidirectional electrons are observed for all times (20%). More complete results on CME indicator correlation for the first full year that Genesis has spent at L1 will be presented at the meeting.

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