Generation of auroral kilometric radiation in upper hybrid wave-lower hybrid soliton interaction

Details Generation of auroral kilometric radiation in upper hybrid wave-lower hybrid soliton interaction Generation of auroral kilometric radiation in upper hybrid wave-lower hybrid soliton interaction

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....9712029p&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. A8, Aug. 1, 1992, p. 12,029-12,044. Research sponsored by CNES, C

Physics

34

Auroras, Kilometric Waves, Solitary Waves, Wave Generation, Wave Interaction, Electron Acceleration, Electron Beams, Plasma Density

Scientific paper

On the basis of observations of sporadic bursts of auroral kilometric radiation (AKR) by the Viking satellite, it is suggested that the formation of lower hybrid solitons may play a role in the generation of AKR. A theoretical model based on the direct acceleration of electrons in the combined lower hybrid soliton and upper hybrid wave fields is proposed. The solitons act as sporadic localized antennas allowing for efficient conversion of the electrostatic energy stored in upper hybrid waves into electromagnetic radiation at a frequency above the X-mode cutoff. Excitation of lower hybrid waves is due to the presence of energetic electron beams in the auroral zone found to be associated with steep plasma density gradients. Upper hybrid waves can be excited by a population of energetic electrons with loss cone distributions. The theory predicts spectral power densities of the order of 10 exp -11 to 10 exp -9 W/sq cm Hz in the source region, in good agreement with the Viking observations.

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