Physics
Scientific paper
Jun 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.4565b&link_type=abstract
Journal of Geophysical Research, vol. 86, June 1, 1981, p. 4565-4573. Research sponsored by the U.S. Department of Energy and M
Physics
170
Abundance, Current Sheets, Helium, Hydrogen, Solar Wind, Imp, Interplanetary Magnetic Fields, Plasma Composition, Solar Corona, Time Response
Scientific paper
Solar wind flow properties associated with very low helium to hydrogen abundance ratios have been observed with Los Alamos instruments on IMP 6, 7, and 8 during 1971-1978. A characteristic pattern has been discovered consisting of correlated interplanetary field reversals, high plasma density, low and nearly identical H(+) and He(2+) bulk velocities, low H(+) and He(2+) kinetic temperatures, and minima in their ratios. Because coronal streamers straddle the current sheet close to the sun, the pattern discovered is the 'signal' of a coronal streamer at 1 AU. A superposed epoch analysis of 74 well-defined sector boundary crossings provides verification of the above correlation featuring a pronounced minimum in the helium to hydrogen abundance ratio at the sector boundary passage.
Bame J. Jr. S.
Borrini G.
Feldman William C.
Gosling Jack T.
Wilcox John M.
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