Proton beam generation of oblique whistler waves

Details Proton beam generation of oblique whistler waves Proton beam generation of oblique whistler waves

May 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....93.4110w&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 93, May 1, 1988, p. 4110-4114.

Physics

34

Bow Waves, Energetic Particles, Geomagnetism, Proton Beams, Wave Propagation, Whistlers, Cold Plasmas, Temperature Distribution

Scientific paper

It is known that ion beams are capable of generating whistler waves that propagate parallel to the mean magnetic field. Such waves may have been observed both upstream of the earth's bow shock and in the vicinity of comets. Previous analyses are extended to include propagation oblique to the mean magnetic field. The instability is generated by the perpendicular component of free energy in the ions, which can arise either via a temperature anisotropy or via a gyrating distribution. In the former case, the generation of whistler waves is confined to a fairly narrow cone of propagation directions centered about parallel propagation; in the latter case, the maximum growth of the instability can occur at fairly large obliquities (theta equal to about 50 deg).

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