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Generation of Z mode radiation by diffuse auroral electron precipitationThe generation of Z mode waves by diffuse auroral electron precipitation is investigated assuming that a loss cone exists in the upgoing portion of the distribution due to electron interactions with the atmosphere. The waves are generated at frequencies above, but very near, the local electron cyclotron frequency omega(e) and at wave normal angles larger than 90 deg. In agreement with Hewitt et al. (1983), the group velocity is directed downward in regions where the ratio of the upper hybrid frequency omega(pe) to Omega(e) is less than 0.5, so that Z mode waves excited above a satellite propagate toward it and away from the upper hybrid resonance. Z mode waves are excited in a frequency band between Omega(e) and about 1.02 Omega(e), and with maximum growth rates of about 0.001 Omega(e). The amplification length is about 100 km, which allows Z mode waves to grow to the intensities observed by high-altitude satellites.
Document ID
19850044821
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Dusenbery, P. B.
(Colorado, University; NOAA, Space Environment Laboratory, Boulder, CO, United States)
Lyons, L. R.
(Aerospace Corp. Space Science Laboratory, Los Angeles, CA, United States)
Date Acquired
August 12, 2013
Publication Date
March 1, 1985
Publication Information
Publication: Journal of Geophysical Research
Volume: 90
ISSN: 0148-0227
Subject Category
Geophysics
Accession Number
85A26972
Funding Number(s)
PROJECT: AF PROJECT E503-0843
CONTRACT_GRANT: NASA ORDER W-15347
OTHER: NSF ATM-82-04647
Distribution Limits
Public
Copyright
Other

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