Interpretation of He-3 abundance variations in the solar wind

Details Interpretation of He-3 abundance variations in the solar wind Interpretation of He-3 abundance variations in the solar wind

Jul 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984soph...93..415c&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 93, July 1984, p. 415-434. Research supported by the University of Maryland and Swiss Natio

Physics

44

Helium Isotopes, Solar Activity, Solar Wind, Interplanetary Magnetic Fields, Solar Flares

Scientific paper

The ion composition instrument on ISEE-3 has observed the isotopes of helium of mass 3 and 4 in the solar wind between August 1978 and July 1982. The long-term average 4He++/3He++ flux ratio >R<, was 2050±200. The >R< values for 6-month intervals show statistically significant differences. The highest of these values is 2300 and coincides with the solar maximum of cycle 21. It is also found that >R< drops under conditions of low proton flux in the solar wind, and that it is high when solar wind speeds are lowest. At times of sector boundary current sheet crossings, identified with coronal streamers, there is a characteristic rise in the value of >R<. Autocorrelations have been computed for 4He++ and 3He++ and indicate correlation times of about 14 and 20 hr, respectively.

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