Physics
Scientific paper
Sep 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jgr....87.7370b&link_type=abstract
Journal of Geophysical Research, vol. 87, Sept. 1, 1982, p. 7370-7378. Research supported by the Max C. Fleischmann Foundation
Physics
79
Abundance, Helium, Solar Wind, Shock Waves, Solar Corona, Solar Radio Bursts, Statistical Analysis, Sudden Storm Commencements
Scientific paper
Evidence for a link between helium enhancements at 1 AU and transient coronal mass ejections is provided by the statistical analysis of 73 large helium abundance enhancement observations made by IMPs 6, 7 and 8 over 1972-1978. These events, in which helium abundance enhancement is greater than about 10%, are sporadic, sometimes clustered in time, occur approximately in phase with the solar cycle, and nearly 50% of them are associated with interplanetary shocks and/or geomagnetic activity sudden commencements. The plasma pattern associated with them is nevertheless independent of shock occurrence, and features high magnetic field strength, low alpha-proton velocity difference, and low proton temperature, suggesting that the enhancement is embedded in a closed, magnetically dominated structure that expands adiabatically. Evidence of an association between helium enhancement at 1 AU and type II and IV radio bursts in the corona is presented.
Bame J. Jr. S.
Borrini G.
Feldman William C.
Gosling Jack T.
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