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Multiple frequency radar observations of high-latitude E region irregularities in the HF modified ionosphereThis paper discusses the results of the September 1983 observations of artificial field-aligned irregularities (AFAIs) in the Tromso, Norway region, made by backscatter radars operating at 46.9, 143.8, 21.4, and 140.0 MHz. Four classes of resonant instability processes at work in the E and F regions are examined in detail: (1) the coupling of parametric decay instability waves across geomagnetic field lines, (2) thermal parametric instability, (3) four-wave interaction thermal parametric instability, and (4) the resonance instability. The characteristics of the AFAI scatter are described, with special attention given to the growth and decay time constants, functional dependence on the heater power and polarization, and the scattering cross sections of the irregularities.
Document ID
19880035668
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Noble, S. T.
(SRS Corp. Houston, TX, United States)
Gordon, W. E.
(Rice University Houston, TX, United States)
Djuth, F. T.
(Aerospace Corp. Los Angeles, CA, United States)
Jost, R. J.
(NASA Johnson Space Center; SRS Corp. Houston, TX, United States)
Hedberg, A.
(Uppsala Ionospheric Observatory Sweden)
Date Acquired
August 13, 2013
Publication Date
December 1, 1987
Publication Information
Publication: Journal of Geophysical Research
Volume: 92
ISSN: 0148-0227
Subject Category
Geophysics
Accession Number
88A22895
Funding Number(s)
OTHER: NSF ATM-85-15494
PROJECT: AF PROJECT ESD-3-0918
OTHER: NSF ATM-81-16046
OTHER: NSF ATM-84-13306
Distribution Limits
Public
Copyright
Other

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