EXOS-D observations of electric field fluctuations and charged particle precipitation in the polar cusp

Details EXOS-D observations of electric field fluctuations and charged particle precipitation in the polar cusp EXOS-D observations of electric field fluctuations and charged particle precipitation in the polar cusp

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991georl..18..305m&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 18, Feb. 1991, p. 305-308.

Physics

9

Charged Particles, Electric Fields, Exos-D Satellite, Field Aligned Currents, Particle Precipitation, Polar Cusps, Exos Satellites, Geomagnetism, Interplanetary Magnetic Fields, Magnetic Field Reconnection, Magnetopause, Magnetosheath

Scientific paper

EXOS-D has observed irregular and spiky electric fields at the polar cusp in the altitude range of 4,000 to 10,000 km. The oscillations have amplitude of tens of mV/m and a broadband spectrum. High-frequency (above 0.5 Hz) oscillations are associated with the precipitation of magnetosheath-originated plasma, i.e., ions in the energy range of 0.1 to 1 keV/e and electrons above 100 eV/e. Oscillatory electric fields can also be observed all along the auroral oval, but they are more intense and more frequently seen at the cusp. The nature of these oscillations is discussed in terms of two possible mechanisms: (1) Doppler-shifted quasi-static structure of field-aligned current and (2) Alfven waves propagated along magnetic field lines. The high-frequency turbulence in the polar cusp region is due to Alfven waves propagated from the magnetopause, where interplanetary and geomagnetic field lines are reconnected and the magnetosheat plasma is injected into the polar cusp.

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