Plasma waves in the polar cusp - Observations from Hawkeye 1

Details Plasma waves in the polar cusp - Observations from Hawkeye 1 Plasma waves in the polar cusp - Observations from Hawkeye 1

Apr 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jgr....83.1447g&link_type=abstract

Journal of Geophysical Research, vol. 83, Apr. 1, 1978, p. 1447-1462. Navy-supported research;

Physics

16

Atmospherics, Earth Magnetosphere, Hawkeye Satellites, Plasma Waves, Polar Cusps, Polar Regions, Satellite Observation, Cyclotron Radiation, Electrostatic Probes, Electrostatic Waves, Extremely Low Radio Frequencies, Hiss, Magnetic Measurement, Plasma Sheaths, Whistlers

Scientific paper

Based on data from the Hawkeye 1 spacecraft in the polar-cusp vicinity, the characteristics of plasma waves are studied. Four types of plasma waves are identified: (1) a band of ULF-ELF magnetic noise, (2) broadband electrostatic emissions with maximum intensities at 10-50 Hz, (3) electrostatic electron cyclotron waves near electron gyrofrequency, and (4) whistler mode auroral hiss emissions. Only ULF-ELF noise is a reliable index of the polar cusp region. Since ULF-ELF magnetic noise extends only to the local electron gyrofrequency, it is suggested that the noise consists of whistler-mode electromagnetic waves. Possible mechanisms for this noise include the whistler-mode cyclotron-resonance, Kelvin-Helmholtz, and drift-wave instabilities. It is felt that a current-driven electrostatic instability causes the broadband electrostatic noise.

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