Proton beam generation of whistler waves in the earth's foreshock

Details Proton beam generation of whistler waves in the earth's foreshock Proton beam generation of whistler waves in the earth's foreshock

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....9212419w&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, Nov. 1, 1987, p. 12419-12424.

Other

36

Bow Waves, Cyclotron Frequency, Proton Beams, Shock Waves, Whistlers, International Sun Earth Explorers, Magnetic Fields

Scientific paper

It is shown that proton beams, often observed upstream of the earth's bow shock and associated with the generation of low-frequency hydromagnetic fluctuations, are also capable of generating whistler waves. The waves can be excited by an instability driven by two-temperature streaming Maxwellian proton distributions which have T (perpendicular)/T(parallel) much greater than 1. It can also be excited by gyrating proton beam distributions. These distributions generate whistler waves with frequencies ranging from 10 to 100 times the proton cyclotron frequency (in the solar wind reference frame) and provide another mechanism for generating the '1-Hz' waves often seen in the earth's foreshock.

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