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Correlation of auroral hiss and upward electron beams near the polar cuspData were obtained from the DE-1 high-altitude plasma instrument (HAPI) and plasma wave instrument (PWI) during outbound passes through the polar cusp near local noon. The observed distribution functions of electron beams are fitted by drifting Maxwellian functions and the observed distribution functions of hot background electrons by isotropic Maxwellian functions. In addition, the cold plasma density is inferred from knowledge of the electron plasma frequency and the measured density of the warm plasma, including the electron beam distribution. The empirically fitted plasma parameters, including density, temperature and drifting energy, are used to solve the linear dispersion equation for the resulting whistler mode emissions. Because the whistler mode becomes quasi-electrostatic for wave-normal angles near the resonance cone, the electrostatic approximation is used for the whistler mode dispersion relation. The results of wave instability analyses are then compared with the wave observations. A ray tracing of cusp hiss emission is conducted to locate the wave source region (at about one earth-radius).
Document ID
19840040877
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Lin, C. S.
(Southwest Research Inst. San Antonio, TX, United States)
Burch, J. L.
(Southwest Research Institute San Antonio, TX, United States)
Shawhan, S. D.
(Southwest Research Inst. San Antonio, TX, United States)
Gurnett, D. A.
(Iowa, University Iowa City, IA, United States)
Date Acquired
August 12, 2013
Publication Date
February 1, 1984
Publication Information
Publication: Journal of Geophysical Research
Volume: 89
ISSN: 0148-0227
Subject Category
Geophysics
Accession Number
84A23664
Funding Number(s)
CONTRACT_GRANT: NAS5-25690
CONTRACT_GRANT: NAS5-25693
CONTRACT_GRANT: NGL-16-001-043
CONTRACT_GRANT: F19628-82-K-0024
Distribution Limits
Public
Copyright
Other

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