Ray tracing survey of Z mode emissions from source regions in the high-altitude auroral zone

Details Ray tracing survey of Z mode emissions from source regions in the high-altitude auroral zone Ray tracing survey of Z mode emissions from source regions in the high-altitude auroral zone

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....9113559m&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 91, Dec. 1, 1986, p. 13559-13568.

Physics

10

Atmospheric Radiation, Auroral Zones, Masers, Propagation Modes, Ray Tracing, Bandwidth, Cyclotron Radiation, Cyclotron Resonance, Dynamics Explorer 1 Satellite, Field Aligned Currents, Plasma Density

Scientific paper

The ray tracing computer program described by Menietti and Lin (1985) was used to investigate the propagation of Z mode emissions from sources in the auroral zone. The calculation results indicate that the propagation is primarily perpendicular to the magnetic field line (horizontal propagation) for almost all sources considered, except when the wave source is assumed to be unrestricted by the cyclotron maser mechanism. While the propagation is initially downward, refraction rapidly increases the wave normal angle, and only propagation at near-constant altitude occurs. The frequency bandwidth estimated from the ray paths was found to be less than that observed by the DE 1 satellite. Large horizontal magnetic field gradients associated with field-aligned currents produce downward propagation but are still not sufficient to produce the observed bandwidths. The results suggest that wave growth may be due to mechanisms in addition to cyclotron maser resonance.

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