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The noon and midnight mid-latitude trough as seen by Ariel 4The electron density data returned by the polar orbiting satellites Ariel 3 and Ariel 4 revealed that the midlatitude trough is one of the distinct large-scale features of the ionosphere at about 550 km. Recent work (e.g., Tulunay and Grebowsky, 1975) on the data included the investigation of the temporal development of the latitudinal position of the midlatitude electron density trough at dawn and dusk during the large magnetic storms of May 1967 and May 1972. Model calculations which assumed that the equatorial convection E-field varies in step with the Kp index reproduced on the average the observed behavior. In the present paper, trough observations made at noon and midnight during the period, 12-21 December 1971 which encompassed a relatively large magnetic storm are discussed. In this context, model calculations have been employed as a guide of average approximations of the actual situation in predicting the plasmapause location. It is also shown that the trough observed on the noon passes is not generally plasmapause-related as the nightside troughs are expected to be.
Document ID
19780067008
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Tulunay, Y. K.
(Middle East Technical University Ankara, Turkey)
Grebowsky, J. M.
(NASA Goddard Space Flight Center Greenbelt, Md., United States)
Date Acquired
August 9, 2013
Publication Date
July 1, 1978
Subject Category
Geophysics
Accession Number
78A50917
Distribution Limits
Public
Copyright
Other

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