Plasma waves in the range of the lower hybrid frequency - ISEE 1 and 2 observations at the earth's bow shock

Details Plasma waves in the range of the lower hybrid frequency - ISEE 1 and 2 observations at the earth's bow shock Plasma waves in the range of the lower hybrid frequency - ISEE 1 and 2 observations at the earth's bow shock

Sep 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....93.9695m&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 93, Sept. 1, 1988, p. 9695-9708.

Computer Science

Sound

8

Bow Waves, Plasma Waves, Satellite Sounding, Shock Wave Propagation, Space Plasmas, Electric Fields, International Sun Earth Explorers, Satellite-Borne Instruments

Scientific paper

This report presents a characterization of plasma wave noise in the range of the lower hybrid frequency associated with 65 crossings of earth's bow shock observed by the ISEE 1 and 2 satellites. Wave growth generally becomes detectable at the upstream edge of the shock foot, increases at the upstream edge of the shock ramp, peaks within the ramp, and then quickly decays to steady downstream values. The upstream extent of the noise is on the same order as that of specularly reflected gyrating ions. Similar profiles were observed in subcritical and supercritical shocks, and no special behavior was associated with the first critical Mach number. Spectra in the foot and ramp were similar in shape, although the noise was 1 to 2 orders of magnitude more intense in the shock ramps than in the feet. Electric field intensities are positively correlated with solar wind speed and inversely related to electron beta and Mach number. Magnetic components are positively correlated with Mach number and beta. The results are generally consistent with suggestions that the noise consists of lower hybrid waves driven by reflected gyrating ions in the foot, and by additional instabilities, such as the cross-field current, in the shock ramp.

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