Plasma Waves in the Polar Cusp: Observations from Hawkeye 1.
IOWA UNIV IOWA CITY DEPT OF PHYSICS AND ASTRONOMY
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In this paper we investigate the characteristics of plasma waves observed by the Hawkeye 1 spacecraft in the vicinity of the polar cusp. The primary types of plasma waves associated with the polar cusp are 1 a band of ULF-ELF magnetic noise extending from a few Hz to several hundred Hz, 2 a broad-band electrostatic emission extending from a few Hz to about 30 to 100 kHz, with maximum intensities at about 10 to 50 Hz, 3 electrostatic electron cyclotron waves near the electron gyrofrequency and 4 whistler-mode auroral hiss emissions. Of these various types of waves, only the ULF-ELF magnetic noise is uniquely associated with the cusp in the sense that the noise can be used as a reliable indicator of the polar cusp region. All of the other types of plasma waves occur in regions adjacent to the polar cusp as well as in the cusp itself.
- Atmospheric Physics
- Plasma Physics and Magnetohydrodynamics