Harmonic H(+) gyrofrequency structures in auroral hiss observed by high-altitude auroral sounding rockets

Details Harmonic H(+) gyrofrequency structures in auroral hiss observed by high-altitude auroral sounding rockets Harmonic H(+) gyrofrequency structures in auroral hiss observed by high-altitude auroral sounding rockets

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....96.9627k&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, June 1, 1991, p. 9627-9638.

Computer Science

Sound

22

Auroral Echoes, Gyrofrequency, Harmonics, Hydrogen Ions, Very Low Frequencies, Auroral Zones, Electron Precipitation, Satellite Sounding, Sounding Rockets

Scientific paper

Two recent sounding rocket experiments have yielded VLF wave data with spectral structures ordered by the hydrogen gyrofrequency. The spectral structures occur near and above the lower hybrid frequency in association with auroral hiss. These structures are observed within and near regions of auroral electron precipitation and transverse ion acceleration. They are accompanied by auroral hiss but are anticorrelated with spectral peaks at the lower hybrid frequency. They are typically found above 500 km altitude, have no measurable magnetic component, and are at least occasionally short wavelength. Because the spectral structures appear to be electrostatic, are ordered by the hydrogen gyrofrequency, and are short wavelength, the structures are interpreted as modes which connect the lower hybrid mode with the hydrogen Bernstein modes. A study of the plasma wave mode structure in the vicinity of the lower hybrid frequency is presented to substantiate this interpretation. These results imply that these waves are a common feature of the auroral zone ionsphere above 500 km altitude and exist any time that auroral hiss exists. The absence of previous satellite observations of this phenomenon can be explained by Doppler broadening.

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