Generation of hiss beyond plasmapause by magnetosonic waves

Details Generation of hiss beyond plasmapause by magnetosonic waves Generation of hiss beyond plasmapause by magnetosonic waves

Sep 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977p%26ss...25..833b&link_type=abstract

Planetary and Space Science, vol. 25, Sept. 1977, p. 833-837.

Physics

2

Hiss, Magnetoacoustic Waves, Magnetosonic Resonance, Plasmapause, Cosmic Noise, Cyclotron Frequency, Oxygen Ions, Proton Resonance

Scientific paper

Magnetosonic waves near the harmonics of proton cyclotron frequency can become unstable in the presence of oxygen ions in the ring current. For cos theta 0 (theta being the angle between the wave vector and the geomagnetic field) the growth rates are peaked at some optimum value of the oxygen ion density, whereas for cos theta not equal to 0 they are reduced with the increase of oxygen ion density. The presence of hot oxygen ions can generate instability near the harmonics of oxygen cyclotron frequency. The growth rates are enhanced with the increase of cos theta. This mechanism can generate discrete spectrum of ELF hiss beyond the plasmapause.

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