The electromagnetic ion beam instability upstream of the earth's bow shock

Details The electromagnetic ion beam instability upstream of the earth's bow shock The electromagnetic ion beam instability upstream of the earth's bow shock

Aug 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.6691g&link_type=abstract

Journal of Geophysical Research, vol. 86, Aug. 1, 1981, p. 6691-6696. Research sponsored by the U.S. Department of Energy and N

Physics

118

Bow Waves, Geomagnetism, Ion Beams, Magnetospheric Instability, Plasma-Electromagnetic Interaction, Shock Fronts, Solar Terrestrial Interactions, Computerized Simulation, Cyclotron Frequency, Energetic Particles, Ion Acoustic Waves, Magnetic Disturbances, Magnetic Field Configurations, Plasma Oscillations, Whistlers

Scientific paper

The linear theory of the electromagnetic ion beam instability for arbitrary angles of propagation has been studied. The parameters considered in the theory are typical of the solar wind upstream of the earth's bow shock when a 'reflected' proton beam is present. Maximum growth occurs for propagation parallel to the ambient magnetic field B, but this instability also displays significant growth at wave-vectors oblique to B. Oblique, unstable modes seem to be the likely source of the compressive magnetic fluctuations recently observed in conjunction with the 'diffuse' ion population. An energetic ion beam does not directly give rise to linear growth of either ion acoustic or whistler mode instabilities.

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