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Large ion concentration gradients below the equatorial F peak.Very large vertical and longitudinal gradients in the ion concentrations are observed below the F peak near the magnetic equator with the retarding potential analyzer on Ogo 6. Ion concentration 'bite outs' of up to a factor of 1000 are observed above 400 km. They appear to be associated with the bottomside of the nighttime F layer. The ion composition in the minima may contain large fractions of ions heavier than O(+) (e.g., NO(+) and Fe(+)). It is suggested that convective electric fields associated with spread F steepen the bottomside of the F layer and also introduce longitudinal irregularities in the vertical ion concentration profiles.
Document ID
19730039936
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Hanson, W. B.
Sanatani, S.
(Texas, University Dallas, Tex., United States)
Date Acquired
August 7, 2013
Publication Date
March 1, 1973
Publication Information
Publication: Journal of Geophysical Research
Volume: 78
Subject Category
Geophysics
Report/Patent Number
NSSDC-ID-69-051A-03-PM
Accession Number
73A24738
Funding Number(s)
CONTRACT_GRANT: NGL-44-004-001
CONTRACT_GRANT: NAS5-9311
CONTRACT_GRANT: NSF GA-31318
Distribution Limits
Public
Copyright
Other

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