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Model and observation comparison of the universal time and IMF by dependence of the ionospheric polar holeThe polar ionospheric F-region often exhibits regions of marked density depletion. These depletions have been observed by a variety of polar orbiting ionospheric satellites over a full range of solar cycle, season, magnetic activity, and universal time (UT). An empirical model of these observations has recently been developed to describe the polar depletion dependence on these parameters. Specifically, the dependence has been defined as a function of F10.7 (solar), summer or winter, Kp (magnetic), and UT. Polar cap depletions have also been predicted /1, 2/ and are, hence, present in physical models of the high latitude ionosphere. Using the Utah State University Time Dependent Ionospheric Model (TDIM) the predicted polar depletion characteristics are compared with those described by the above empirical model. In addition, the TDIM is used to predict the IMF By dependence of the polar hole feature.
Document ID
19920032835
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Sojka, J. J.
(Utah State Univ. Logan, UT, United States)
Schunk, R. W.
(Utah State University Logan, United States)
Hoegy, W. R.
(Utah State Univ. Logan, UT, United States)
Grebowsky, J. M.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1991
Publication Information
Publication: Advances in Space Research
Volume: 11
Issue: 10 1
ISSN: 0273-1177
Subject Category
Geophysics
Accession Number
92A15459
Funding Number(s)
CONTRACT_GRANT: NSF ATM-89-13230
CONTRACT_GRANT: NAS8-37110
Distribution Limits
Public
Copyright
Other

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