Physics
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsh11b0266s&link_type=abstract
American Geophysical Union, Fall Meeting 2005, abstract #SH11B-0266
Physics
2162 Solar Cycle Variations (7536), 2164 Solar Wind Plasma, 2169 Solar Wind Sources
Scientific paper
As the second most abundant element in the heliosphere, helium plays a significant role in the dynamics of the solar interior, corona, and solar wind. The relative abundance by number density of helium to hydrogen (He/H) in the solar wind plasma can vary by factors of hundreds, with typical values in the undisturbed solar wind rarely exceeding 5%. During solar minimum, He/H is a linear function of speed, while at solar maximum He/H is 4.5% on average at all speeds. There are periods at solar maximum where the distribution of He/H is bi-modal, with one peak at the solar maximum 4.5%, and a second, smaller peak at the speed-dependent solar minimum value. We have combined interplanetary measurements of He/H from the Wind spacecraft with derived plasma flow from the MAS 3D MHD coronal model of the solar corona and inner heliosphere to identify the source regions of the slow solar wind that produce these distinct helium populations.
Kasper Justin Christophe
Lazarus Andrew J.
Riley Pete
Steinberg John T.
Stevens Mark L.
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