The Helium Focusing Cone During the Solar Cycle: ACE/SWICS Observations

Details The Helium Focusing Cone During the Solar Cycle: ACE/SWICS Observations The Helium Focusing Cone During the Solar Cycle: ACE/SWICS Observations

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....7050m&link_type=abstract

EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #7050

Physics

Scientific paper

The inflowing interstellar neutral helium atoms form, under solar gravitation, a cone of high He concentration in the wake of Sun's motion relative to the local interstellar medium (LISM). This helium cone has been detected as an intense source of He+ pickup ions. ACE/SWICS, which is capable of detecting He+ pickup ions, has six passages through the He cone in the winters of 1997-2002, a significant portion of the current solar cycle. We report on the time variation of the concentrations of the He cone as observed by ACE/SWICS during this period. We further discuss the effect of the solar cycle on inflowing LISM helium.

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