Conversion of electrostatic upper hybrid emissions to electromagnetic O and X mode waves in the earth's magnetosphere

Details Conversion of electrostatic upper hybrid emissions to electromagnetic O and X mode waves in the earth's magnetosphere Conversion of electrostatic upper hybrid emissions to electromagnetic O and X mode waves in the earth's magnetosphere

Feb 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987angeo...5...21b&link_type=abstract

Annales Geophysicae, Series A - Upper Atmosphere and Space Sciences (ISSN 0980-8752), vol. 5, Feb. 1987, p. 21-28.

Physics

3

Earth Magnetosphere, Electromagnetic Radiation, Electrostatic Waves, Cold Plasmas, Kilometric Waves

Scientific paper

The linear conversion of electrostatic upper hybrid emissions via the Z mode to electromagnetic ordinary (O) mode waves has for some time been invoked for the source of Terrestrial and Saturnian myriametric and Jovian kilometric radiations. The conversion occurs by virtue of the emissions' propagation in concentration gradients, and for it to be efficient it is necessary for the gradient to be normal to the ambient magnetic field. Suitable concentration gradients are believed to occur at the plasmapause and at the magnetopause. Ray theory predicts only O mode production whereas full wave theory in a cold plasma shows that both O and X (extraordinary) mode are produced, their relative intensities depending on the plasma parameters. Full wave theory in a warm plasma, besides yielding more accurate information on the O and X modes also provides an insight into the effect of conversion on the source plasma wave. Results obtained from these three levels of theory are compared using plasma parameters derived from wave experiments on spacecraft.

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