Physics
Scientific paper
Feb 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984angeo...2...95j&link_type=abstract
Annales Geophysical (ISSN 0755-0685), vol. 2, Jan.-Feb. 1984, p. 95-103.
Physics
Atmospheric Radiation, Auroral Zones, Kilometric Waves, Plasma Density, Radio Auroras, Magnetic Fields, Propagation Modes, Ray Tracing, Refractivity, Remote Sensing, Satellite Observation
Scientific paper
A production mechanism for left-polarized ordinary auroral kilometric radiation (LOAKR) is proposed on the basis of published satellite measurements. A mechanism analogous to that described by Jones (1976, 1980, 1981, 1982, 1983) for terrestrial myriametric radiation is examined: electrostatic waves produced near the upper-hybrid resonance frequency are converted to electromagnetic Z-mode radiation and then to LOAKR as they propagate through field-aligned plasma-density gradients. The theoretical framework is introduced; the observations of plasma-density enhancements, upper-hybrid waves, and AKR beaming are summarized; a computer model of a density enhancement and associated ray paths is developed; and the beaming model is applied to interpret satellite data as remote-sensing measurements of AKR source regions. The rapid frequency variation of LOAKR is attributed to the distance of the observing spacecraft and the longitudinal motion of the convecting field-aligned source regions.
Gapper G.
Herring Ryan
Jones Damien
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