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Uniformly spaced field-aligned ionization ductsA number of interesting cases of combination mode ducted echoes for mid- and low-latitude regions are presented that show nearly uniformly spaced multiple combination mode traces on the ionograms in the frequency range above 1 MHz. These traces suggest that a parallel system of field-aligned ducts is present. Ray tracing studies are made to determine the structure that would explain the observations using the electron density profile derivable from the vertical trace and assuming field-aligned ducts. Spacing perpendicular to the ducts is found to be as much as 70 km. Some of these parallel duct structures are found to extend to the conjugate hemisphere, possibly to the F peak.
Document ID
19850029394
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Gross, S. H.
(New York, Polytechnic Institute, Farmingdale, NY, United States)
Muldrew, D. B.
(Department of Communications, Communications Research Centre Ottawa, Canada)
Date Acquired
August 12, 2013
Publication Date
October 1, 1984
Publication Information
Publication: Journal of Geophysical Research
Volume: 89
ISSN: 0148-0227
Subject Category
Geophysics
Accession Number
85A11545
Funding Number(s)
CONTRACT_GRANT: NAGW-284
Distribution Limits
Public
Copyright
Other

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