Electrostatic ion waves generated by ion loss-cone distributions in the magnetosphere

Details Electrostatic ion waves generated by ion loss-cone distributions in the magnetosphere Electrostatic ion waves generated by ion loss-cone distributions in the magnetosphere

Jun 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986angeo...4..241a&link_type=abstract

Annales Geophysicae, Series A - Upper Atmosphere and Space Sciences, vol. 4, June 1986, p. 241-246.

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3

Electrostatic Waves, Ionic Waves, Magnetospheric Ion Density, Space Plasmas, Heavy Ions, Ion Cyclotron Radiation, Magnetohydrodynamic Stability, Wave Dispersion

Scientific paper

Electrostatic ion waves and distributions of cool electrons are believed to coexist in the magnetosphere. Earlier calculations indicate that ion loss-cone distributions can resonantly generate electrostatic ion waves between multiples of the ion gyrofrequency, but that these waves are heavily damped by cool electrons. It is shown that electrostatic ion waves may be resonantly destabilized also in the presence of cool electrons, and that these emissions often occur close to multiples of the ion gyrofrequency. Detailed theoretical understanding of these waves is important for the interpretation of wave observations made in space plasmas, and also for investigations of the formation of ion conics and the auroral precipitation of ions. Furthermore, ion loss-cone distributions may non-resonantly destabilize emissions near the lower hybrid frequency. For wavevectors strictly perpendicular to the ambient magnetic field, these emissions may be harmonically spaced by the ion gyrofrequency, but an investigation of all propagation angles shows that the waves are often broadband. In connection with these non-resonant instabilities, negative energy modes can occur. These modes may lead to explosive instabilities when they non-linearly interact with other waves.

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