Variation of He/H in the slow solar wind
Abstract
I will review recent work on the variation of the relative abundance of helium to hydrogen in the solar wind. The number density ratio He/H is one of the most variable quantities in the solar wind, from up to 25% in disturbed solar wind down to much less than one percent. As such, helium acts both as a tracer of the history of the solar wind and as a major participant in the dynamics. In this talk I will review work on the speed, latitude, and solar cycle dependence of He/H in the solar wind and the implications for the multiple sources of slow solar wind.
- Publication:
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Solar Heliospheric and INterplanetary Environment (SHINE 2009
- Pub Date:
- August 2009
- Bibcode:
- 2009shin.confE.136K