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Plasma waves in the polar cusp - Observations from Hawkeye 1Based 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.
Document ID
19780050640
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Gurnett, D. A.
(Iowa Univ. Iowa City, IA, United States)
Frank, L. A.
(Iowa, University Iowa City, Iowa, United States)
Date Acquired
August 9, 2013
Publication Date
April 1, 1978
Publication Information
Publication: Journal of Geophysical Research
Volume: 83
Subject Category
Geophysics
Accession Number
78A34549
Funding Number(s)
CONTRACT_GRANT: NAS1-11257
CONTRACT_GRANT: NAS1-13129
CONTRACT_GRANT: NGL-16-001-002
CONTRACT_GRANT: NGL-16-001-043
Distribution Limits
Public
Copyright
Other

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