Propagation and amplification of auroral kilometric radiation in finite width auroral cavities

Details Propagation and amplification of auroral kilometric radiation in finite width auroral cavities Propagation and amplification of auroral kilometric radiation in finite width auroral cavities

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....9719299g&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. A12, p. 19,299-19,310.

Physics

Optics

12

Amplification, Auroral Zones, Kilometric Waves, Larmor Radius, Magnetic Poles, Wave Propagation, Electron Precipitation, Geomagnetism, Geometrical Optics, Ray Tracing

Scientific paper

We investigate amplification of the auroral kilometric radiation over the geomagnetic poles. The physical parameters needed for the calculation are obtained from a particular model that approximately reproduces the conditions in the auroral zone, taking into account density gradients perpendicular to the geomagnetic field and also the parallel magnetic field gradient. The components of the dielectric tensor are calculated in the locally homogeneous plasma approximation, and the dispersion relation is exactly solved with all harmonics and powers of the Larmor radius needed for the convergency of the solution. We also make a ray tracing study in the geometrical optics approximation, using the method of Poeverlein. The ray tracing study shows that the spatial scale of inhomogeneity, perpendicular to the magnetic field, is a very important factor in the amplification and that the distance to obtain a given amplification can be substantially reduced when the density gradient is increased.

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