Lower hybrid wave phenomena associated with density depletions

Details Lower hybrid wave phenomena associated with density depletions Lower hybrid wave phenomena associated with density depletions

Oct 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jgr....9919513s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 99, no. A10, p. 19,513-19,525

Physics

43

Cavitons, Earth Ionosphere, Magnetoelastic Waves, Plasma Density, Wave Propagation, Whistlers, Depletion, Electric Fields, Mathematical Models

Scientific paper

A fluid description of lower hybrid, whistler and magnetosonic waves is applied to study wave phenomena near the lower hybrid resonance associated with plasma density depletions. The goal is to understand the nature of lower hybrid cavitons and spikelets often associated with transverse ion acceleration events in the auroral ionosphere. Three-dimensional simulations show the ponderomotive force leads to the formation of a density cavity (caviton) in which lower hybrid wave energy is concentrated (spikelet) resulting in a three-dimensional collapse of the configuration. Plasma density depletions of the order of a few percent are shown to greatly modify the homogeneous linear properties of lower hybrid waves and account for many of the observed features of lower hybrid spikelets.

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