Impulsive electrostatic waves and field-aligned currents observed in the entry layer

Details Impulsive electrostatic waves and field-aligned currents observed in the entry layer Impulsive electrostatic waves and field-aligned currents observed in the entry layer

Apr 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987georl..14..431e&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 14, April 1987, p. 431-434. Research supported by the U.S. Navy, Swedish Boa

Other

11

Birkeland Currents, Electrostatic Waves, Field Aligned Currents, Ionospheric Currents, Satellite Observation, Broadband, Electron Beams, Polar Cusps

Scientific paper

Impulsive electrostatic waves have been observed in regions of downward-flowing region 1 Birkeland currents in data acquired by the High Frequency Wave and Magnetic Field instruments on the Viking satellite. These data were obtained at approximately 11,000 km altitude and in the 1100 MLT and 76-deg-invariant-latitude sector near the equatorward boundary of the dayside polar cusp. The high-frequency waves are observed between the electron plasma and cyclotron frequencies. It is suggested that electron-acoustic waves may couple with other electron plasma waves, resulting in the distribution of wave power over a wide range of frequencies. A strong correlation exists between large-scale downward-flowing Birkeland currents (region 1 system) and impulsive electrostatic waves. The Viking Magnetic Field experiment makes it possible to resolve, in high time resolution, electron beams that may be unstable to the impulsive electrostatic waves.

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