Earth magnetic field fluctuations produced by filamentation instabilities of electromagnetic heater waves

Details Earth magnetic field fluctuations produced by filamentation instabilities of electromagnetic heater waves Earth magnetic field fluctuations produced by filamentation instabilities of electromagnetic heater waves

Oct 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983georl..10..979k&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 10, Oct. 1983, p. 979-981.

Physics

42

Circular Polarization, Geomagnetism, Ionospheric Drift, Ionospheric Heating, Magnetic Variations, Space Plasmas, High Frequencies, Plasma-Electromagnetic Interaction

Scientific paper

An investigation is made of a mechanism associated with the filamentation instabilities of circularly polarized waves. The capability of producing significantly large earth magnetic field fluctuations in addition to ionospheric density fluctuations is demonstrated. It is suggested that this mechanism is the cause of the earth magnetic field fluctuations reported by Stubbe and Kopka (1981) in ionospheric heating experiments performed in Tromso, Norway. A simple model describes the excitation of a magnetostatic model by circularly polarized heater waves via filamentation instabilities. It is noted that large-scale magnetic field fluctuations can be excited simultaneously with ionospheric density fluctuations. The field-aligned nature of the excited modes derives from the differential ohmic heating effect that makes the proposed mechanism a viable process in the ionosphere. The threshold field intensities and the growth rates of the instabilities are calculated in order to make comparisons with the observations. Good agreement is obtained.

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