Lower hybrid acceleration and ion evolution in the suprauroral region

Details Lower hybrid acceleration and ion evolution in the suprauroral region Lower hybrid acceleration and ion evolution in the suprauroral region

Dec 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981georl...8.1253c&link_type=abstract

Geophysical Research Letters, vol. 8, Dec. 1981, p. 1253-1256. USAF-supported research.

Physics

181

Auroral Zones, Ionospheric Ion Density, Particle Acceleration, Plasma Waves, Plasma-Particle Interactions, Geomagnetism, High Energy Electrons, Ion Cyclotron Radiation, Propagation Modes

Scientific paper

Consideration is given to the lower hybrid acceleration and subsequent evolution of ions of ionospheric origin in the suprauroral region. It is shown that broadband lower hybrid waves generated by energetic electron beams can be quite efficient in accelerating ionospheric H(+) or O(+) ions by tens or hundreds of eV. The ions are accelerated primarily transverse to the field lines, and thus acquire conic distributions, with pitch angles generally between 90 and 140 deg. The transverse energy gained by the ions can then be converted into longitudinal energy as they move upward, and the ions can become field-aligned as they propagate across a kilovolt electrostatic shock. It is argued that the ion distribution resulting from the combination of these accelerated ions and the background ions may lead to the excitation of electrostatic ion cyclotron modes.

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