On the nature of 'overshoot' in a collisionless shock

Details On the nature of 'overshoot' in a collisionless shock On the nature of 'overshoot' in a collisionless shock

Apr 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984p%26ss...32..439e&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 32, April 1984, p. 439-445.

Physics

1

Collisionless Plasmas, Mach Number, Magnetohydrodynamics, Plasma Oscillations, Plasma Waves, Shock Fronts, Bow Waves, Electrostatic Waves, Plasma Dynamics, Proton Beams, Proton Energy, Thermal Energy

Scientific paper

The experimentally observed region of magnetic-field-density 'overshoot' behind a collisionless shock wave is investigated, analyzing observations of perpendicular bow shocks (with Mach numbers between the first and second critical Mach numbers) obtained on November 5, 1977 with ISEE-1 (Greenstadt et al., 1980; Gurnett et al., 1979) and on June 20, 1967 with Vela-4 (Montgomery et al., 1970). It is shown that a high level of lower-hybrid electrostatic oscillations with energy density less than about nT can explain the presence in the overshoot region of plasma density jumps (n2/n1 = about 6) in excess of the maximum jump (n2/n1 = 4) predicted by MHD conservation equations. In the region between the overshoot and state 2, proton-beam energy and electron/ion oscillatory energy are irreversibly transformed into ion heat.

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