Ion and electron heating at the low-Mach-number, quasi-parallel bow shock

Details Ion and electron heating at the low-Mach-number, quasi-parallel bow shock Ion and electron heating at the low-Mach-number, quasi-parallel bow shock

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.3875t&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A3, p. 3875-3888.

Other

8

Earth Atmosphere, Electron Energy, Ion Distribution, Plasma Heating, Shock Wave Propagation, Space Plasmas, Bow Waves, Energy Dissipation, International Sun Earth Explorers, Mach Number, Transverse Waves

Scientific paper

The study examines the magnetic structure and energy dissipation at low-Mach-number, quasi-parallel collisionless shocks on the basis of observations obtained by the ISEE 1 and 2 spacecraft at seven crossings of the earth's dayside bow shock. All the shocks exhibit a fairly short-scale-length ramp where the principal jumps in the electron temperature, ion temperature, and magnetic field strength take place. Large-amplitude LF transverse waves in the magnetic field are present in and downstream from the ramp, with more modest waves upstream. The amplitude of the downstream waves is typically larger than can be accounted for by shock compression of the upstream waves. The electron heating represents about 6 percent of the dissipated bulk flow energy, consistent with observations in other parameter regimes, and suggesting that the dominant electron heating process is the same. It is suggested that the low-Mach-number shocks are reforming but do not exhibit downstream variability because of the relatively low levels of reflected ions.

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