Computer Science – Sound
Scientific paper
Sep 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984georl..11..865e&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 11, Sept. 1984, p. 865-868.
Computer Science
Sound
6
Atmospheric Refraction, Electrostatic Waves, Magnetospheric Electron Density, Plasmapause, Satellite Sounding, Geos 1 Satellite, Ionospheric Propagation, Magnetic Equator, Ray Tracing
Scientific paper
Large amplitude (not less than 10 mV/m) electrostatic plasma waves near the upper hybrid (UH) frequency have been observed from 0 to 50 deg magnetic latitude (MLAT) during satellite plasma-pause crossings. A three-dimensional numerical ray-tracing calculation, based on an electron distribution measured during a GEOS 1 dayside intense upper-hybrid wave event, suggests how UH waves might achieve such large amplitudes away from the geomagnetic equator. Refractive effects largely control the wave amplification and, in particular, the unavoidable refraction due to parallel geomagnetic field gradients restricts growth to levels below those observed. However, a cold electron density gradient parallel to the field can lead to upper hybrid wave growth that can account for the observed emission levels.
Engel Johannes
Kennel Charles F.
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