Electron dynamics and potential jump across slow mode shocks

Details Electron dynamics and potential jump across slow mode shocks Electron dynamics and potential jump across slow mode shocks

Apr 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92.3165s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, April 1, 1987, p. 3165-3174. Research supported by the Nuffield Found

Physics

43

Atmospheric Electricity, Geomagnetic Tail, Magnetospheric Electron Density, Potential Gradients, Shock Heating, Boundary Layer Plasmas, International Sun Earth Explorer 3, Magnetospheric Instability

Scientific paper

In the de Hoffmann-Teller reference frame, the cross-shock electric field is simply the thermoelectric field responsible for preserving charge neutrality. As such, it gives information regarding the heating and dissipation occurring within the shock. The total cross-shock potential can be determined by integrating a weighted electron pressure gradient through the shock, but this requires knowledge of the density and temperature profiles. Here, a recently proposed alternative approach relying on particle dynamics is exploited to provide an independent estimate of this potential. Both determinations are applied to slow mode shocks which form the plasma sheet boundary in the deep geomagnetic tail as observed by ISEE 3. The two methods correlate well. There is no indication of the expected transition from resistive to viscous shocks, although the highest Mach number shocks show the highest potentials. The implications of these results for the electron dissipation mechanisms and turbulence at the shock are discussed.

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