Resonant interactions between cometary ions and low frequency electromagnetic waves

Details Resonant interactions between cometary ions and low frequency electromagnetic waves Resonant interactions between cometary ions and low frequency electromagnetic waves

Dec 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987p%26ss...35.1501t&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 35, Dec. 1987, p. 1501-1511.

Physics

50

Cometary Atmospheres, Electromagnetic Interactions, Ions, Low Frequencies, Cyclotron Radiation, Magnetohydrodynamic Waves, Plasma Density, Plasma Turbulence, Wave Propagation, Comets, Ions, Resonance, Electromagnetic Waves, Models, Water, Source, Energy, Frequencies, Stability, Damping, Magnetohydrodynamics, Beaming, Calculations, Plasma, Amplification, Numerical Methods, Turbulence

Scientific paper

The conditions for resonant wave amplification in a plasma with a ring-beam distribution which is intended to model pick-up ions in a cometary environment are investigated. The inclination between the interplanetary field and the solar wind is found to play a crucial role in governing both the resonant frequency and the growth rate of any unstable mode. It is suggested that the low-frequency MHD mode should experience the most rapid amplification for intermediate inclination. In the frame of the solar wind, such waves should propagate along the field in the direction upstream toward the sun with a phase speed lower than the beaming velocity of the pick-up ions. This mechanism may account for the presence of the interior MHD waves noted by satellites over a region surrounding comets Giacobini-Zinner and Halley.

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