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Universal time dependence of nighttime F region densities at high latitudesCoincident auroral-zone experiments using three incoherent-scatter radars at widely spaced longitudes are reported. The observational results demonstrate that, during the night, the F layer electron density is strongly dependent on the longitude of the observing site. Ionization patches were observed in the nighttime F region from the Chatanika and EISCAT radars, while densities observed from the Millstone radar were substantially smaller. The electron density within these maxima is larger at EISCAT than at Chatanika. When observed in the midnight sector auroral zone, these densities had a peak density at a high altitude of 360-475 km. The density was maximum when EISCAT was in the midnight sector and minimum when Millstone was in the midnight sector. A minimum in insolation in the auroral zone occurs at the UT when Millstone is in the midnight sector.
Document ID
19850051361
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
De La Beaujardiere, O.
(SRI International Corp. Menlo Park, CA, United States)
Wickwar, V. B.
(SRI International Corp. Menlo Park, CA, United States)
Caudal, G.
(CNRS and CNET, Centre de Recherche en Physique de l'Environnement Terrestre et Planetaire, Saint-Maur des Fosses Val-de-Marne, France)
Holt, J. M.
(Northeast Radio Observatory Corp. Westford, MA, United States)
Craven, J. D.
(SRI International Corp. Menlo Park, CA, United States)
Frank, L. A.
(Iowa, University Iowa City, IA, United States)
Brace, L. H.
Date Acquired
August 12, 2013
Publication Date
May 1, 1985
Publication Information
Publication: Journal of Geophysical Research
Volume: 90
ISSN: 0148-0227
Subject Category
Geophysics
Report/Patent Number
AFGL-TR-85-0222
AD-A160574
Accession Number
85A33512
Funding Number(s)
CONTRACT_GRANT: NSF ATM-81-17792
CONTRACT_GRANT: NAS5-25689
CONTRACT_GRANT: N00014-76-C-0016
CONTRACT_GRANT: NSF ATM-78-23658
CONTRACT_GRANT: NAG5-305
CONTRACT_GRANT: F49620-81-C-0042
CONTRACT_GRANT: NGL-16-001-002
CONTRACT_GRANT: F49620-83-K-0005
CONTRACT_GRANT: AF-AFOSR-83-0002
CONTRACT_GRANT: NAG5-306
CONTRACT_GRANT: NSF ATM-81-19477
CONTRACT_GRANT: NAS5-26363
CONTRACT_GRANT: F47121-84-N-0006
Distribution Limits
Public
Copyright
Other

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