Propagation characteristics of dayside low-altitude hiss - Case studies

Details Propagation characteristics of dayside low-altitude hiss - Case studies Propagation characteristics of dayside low-altitude hiss - Case studies

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....9710601l&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. A7, July 1, 1992, p. 10,601-10,620.

Computer Science

Sound

12

Auroral Zones, Extremely Low Frequencies, Magnetohydrodynamic Waves, Plasmapause, Plasmasphere, Wave Propagation, Electromagnetic Fields, Geos 1 Satellite, Hiss, Power Spectra, Satellite Sounding

Scientific paper

Three dayside ELF hiss events observed on the AUREOL 3 satellite are investigated using a comprehensive set of wave analysis techniques. Validity domains are established for each technique. It is found that within the plasmasphere the waves are narrow-band, have a lower cutoff frequency close to the local proton gyrofrequency f sub H(+), and propagate downward with very oblique k vectors directed toward lower L values. Left-hand mode waves are detected just below f sub H(+). Within the plasmapause gradient the waves are broad-band, have lower cutoff frequencies that can be below the local f sub H(+), and propagate downward with k vectors along B sub 0. It is concluded that the reflection at the two-ion cutoff frequency is a very efficient process for returning waves to higher altitudes, and that the large-density gradients that characterize the plasmapause and the cusp act as traps for waves reflected below the satellite.

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