Physics
Scientific paper
Jun 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19.1291m&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 19, no. 12, June 19, 1992, p. 1291-1294. Research supported by DOE.
Physics
25
Electron Distribution, Halos, Solar Electrons, Solar Wind, Ulysses Mission, Interplanetary Magnetic Fields, Photoelectrons, Plasma Density
Scientific paper
Observations from the Ulysses solar wind electron spectrometer are used to make a first examination of the evolution of the solar wind suprathermal or halo electron population as a function of heliocentric distance beyond 1 AU. As the core population cools with increasing heliocentric distance, no gap is formed between the core and halo populations. Rather, the halo electrons extend to increasingly lower energies. As predicted previously on theoretical grounds, the ratio of the core electron temperature to the low energy cutoff of the halo population appears to be roughly constant with a value of about 7.5. The total integrated heat flux drops rapidly with increasing heliocentric distance; a best fit power law of R exp -2.36 is found. In addition, it is found that the ratio of the halo to core densities is roughly constant over heliocentric distance with the halo representing 4 percent of the total electron distribution. These results suggest that the halo population may not consist of truly noninteractive test particles over the heliocentric range of 1-4 AU.
Bame J. Jr. S.
Feldman William C.
Gosling Jack T.
McComas David John
Phillips John Lynch
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