ISEE 3 observations of solar wind thermal electrons with T-perpendicular greater than T-parallel

Details ISEE 3 observations of solar wind thermal electrons with T-perpendicular greater than T-parallel ISEE 3 observations of solar wind thermal electrons with T-perpendicular greater than T-parallel

Oct 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....9413377p&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 94, Oct. 1, 1989, p. 13377-13386. Research sponsored by DOE.

Other

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High Energy Electrons, Hot Electrons, Satellite Observation, Solar Electrons, Solar Wind, Coulomb Collisions, Electron Distribution, International Sun Earth Explorer 3

Scientific paper

This study presents ISEE 3 observations of anomalous electron distributions for which T-perpendicular exceeds T-parallel in the solar wind near 1 AU. Twelve anomaly events were identified, lasting from 24 min to 6 hours. These events generally share the following characteristics: (1) high plasma density, (2) low solar wind speed, (3) magnetic field which is nearly transverse to the flow, and (4) low electron and ion temperatures. The processes of solar wind adiabatic expansion and isotropization via Coulomb collisions could be expected to lead to such anomalous anisotropies under conditions similar to those observed. However, these conditions actually produce T-perpendicular greater than T-parallel for only a small fraction of the time, suggesting that other mechanisms are also important in regulating solar wind electron distributions.

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