Evidence for 5-MHz bistatic radio observations of electrostatic ion cyclotron waves in the auroral plasma

Details Evidence for 5-MHz bistatic radio observations of electrostatic ion cyclotron waves in the auroral plasma Evidence for 5-MHz bistatic radio observations of electrostatic ion cyclotron waves in the auroral plasma

Nov 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....9010983h&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 90, Nov. 1, 1985, p. 10,983-10,990. NSERC-supported research.

Physics

30

Auroral Spectroscopy, Bistatic Reflectivity, Electrostatic Waves, Ion Cyclotron Radiation, Radio Auroras, Radio Observation, Antenna Radiation Patterns, Cyclotron Frequency, Doppler Effect, Space Plasmas

Scientific paper

Results of crossed-beam spectral measurements, made with two bistatic CW Doppler systems operating at 50 MHz, are examined. Such measurements often reveal a type of radio auroral spectrum characterized by narrow peaks near 30 and 55 Hz. The experiment was designed so that spectra could be measured simultaneously from a common scattering region along two directions which differed in azimuth by 65 degrees and which were at magnetic aspect angles of -5 degrees from perpendicularity with the earth's field at 110 km altitude. Frequent observation of these waves shows that the theories must be modified so as to relax the conditions under which the waves occur and to allow for Doppler shifts at almost exactly the gyrofrequencies of the main ions.

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