Electrostatic waves in the bow shock at Uranus

Details Electrostatic waves in the bow shock at Uranus Electrostatic waves in the bow shock at Uranus

Oct 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....9413367m&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 94, Oct. 1, 1989, p. 13367-13376.

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Bow Waves, Electrostatic Waves, Shock Wave Propagation, Uranus Atmosphere, Plasma Probes, Plasma-Particle Interactions, Spacecraft Instruments, Voyager 2 Spacecraft, Wave Interaction, Uranus, Bow Shock, Electrostatic Waves, Emissions, Voyager 2 Mission, Spacecraft Observations, Pws Instrument, Amplitude, Origin, Source, Pls Instrument, Mag Instrument, Electric Fields, Formation, Shock, Particles, Simulations, Plasma Waves, Spectra, Models, Hypotheses, Comparisons

Scientific paper

Electrostatic emissions measured by the Voyager 2 plasma wave detector (PWS) during the inbound crossing of the Uranian bow shock are shown to differ in some aspects from the waves measured during bow shock crossings at Jupiter and Saturn. The wave amplitudes in the foot of the bow shock at Uranus are in general much lower than those detected at the other outer planets due to the unusually enhanced solar wind ion temperature during the crossing. This reduces the effectiveness of wave-particle interactions in heating the incoming electrons. Strong wave emissions are observed in the shock ramp that possibly arise from currents producing a Buneman mode instability. Plasma instrument (PLS) and magnetometer (MAG) measurements reveal a complicated shock structure reminiscent of computer simulations of high-Mach number shocks when the effects of anomalous resistivity are reduced, and are consistent with high ion temperatures restricting the growth of electrostatic waves.

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