Resonance absorption of Alfven waves at comet-solar wind interaction regions

Details Resonance absorption of Alfven waves at comet-solar wind interaction regions Resonance absorption of Alfven waves at comet-solar wind interaction regions

Aug 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988georl..15..740s&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 15, Aug. 1988, p. 740-743.

Physics

14

Cometary Atmospheres, Magnetohydrodynamic Waves, Plasma Interactions, Plasma Resonance, Solar Wind, Bow Waves, Plasma Density, Radiation Absorption, Solar Protons

Scientific paper

The interaction of the low-frequency (0.01 Hz) MHD waves, observed upstream of comets, with the structured plasma near the cometary bow wave is examined. It is suggested that the waves undergo resonant absorption due to either ambient density gradients or localized shear in the background magnetic field. The absorption process can give rise to rapid heating of the solar wind protons, in agreement with observations from Comet Halley. Since the free energy for the generation of MHD waves came from deceleration (without accompanying heating) of the solar wind protons during the pick-up of cometary ions, the subsequent reabsorption of the energy is equivalent to a nonlocal transformation of ordered to random energy and can be described as nonlocal viscosity.

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