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Title: Postsunrise refilling of the low-latitude topside ionosphere

Abstract

Plasma density measurements from a polar-orbiting Defense Meteorological Satellite Program satellite at 840 km have shown the existence of significant plasma depletions near the magnetic equator in the postsunrise hours. The phenomenon is observed regularly during magnetically quiet times near the equinoxes. The magnitude of the depletion depends upon longitude and the time elapsed since sunrise in the lower F region. It is significantly less pronounced or absent near the solstices. During magnetically active periods the low-latitude topside ionosphere is modified due to vertical E x B plasma drifts in the predawn sector. The quiet time equinox observations are interpreted in terms of a diurnal flux tube filling model. It is suggested that the observed equatorial depletions result from a pair of plasma fronts that are moving upward from conjugate ionospheres and that are associated with the early stages of the postsunrise refilling process.

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Physics Department, Boston College, chestnut Hill, Massachusetts 02167
OSTI Identifier:
5865670
Resource Type:
Journal Article
Journal Name:
J. Geophys. Res.; (United States)
Additional Journal Information:
Journal Volume: 84:A8
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; IONOSPHERE; DAILY VARIATIONS; PLASMA DENSITY; LATITUDE EFFECT; MAGNETIC STORMS; PLASMA DRIFT; EARTH ATMOSPHERE; GEOGRAPHICAL VARIATIONS; PLANETARY IONOSPHERES; VARIATIONS; 640201* - Atmospheric Physics- Auroral, Ionospheric, & Magetospheric Phenomena

Citation Formats

Burke, W J, Sagalyn, R C, Rastogi, R G, Ahmed, M, Rich, F J, Donatelli, D E, and Wildman, P J.L. Postsunrise refilling of the low-latitude topside ionosphere. United States: N. p., 1979. Web. doi:10.1029/JA084iA08p04201.
Burke, W J, Sagalyn, R C, Rastogi, R G, Ahmed, M, Rich, F J, Donatelli, D E, & Wildman, P J.L. Postsunrise refilling of the low-latitude topside ionosphere. United States. doi:10.1029/JA084iA08p04201.
Burke, W J, Sagalyn, R C, Rastogi, R G, Ahmed, M, Rich, F J, Donatelli, D E, and Wildman, P J.L. Wed . "Postsunrise refilling of the low-latitude topside ionosphere". United States. doi:10.1029/JA084iA08p04201.
@article{osti_5865670,
title = {Postsunrise refilling of the low-latitude topside ionosphere},
author = {Burke, W J and Sagalyn, R C and Rastogi, R G and Ahmed, M and Rich, F J and Donatelli, D E and Wildman, P J.L.},
abstractNote = {Plasma density measurements from a polar-orbiting Defense Meteorological Satellite Program satellite at 840 km have shown the existence of significant plasma depletions near the magnetic equator in the postsunrise hours. The phenomenon is observed regularly during magnetically quiet times near the equinoxes. The magnitude of the depletion depends upon longitude and the time elapsed since sunrise in the lower F region. It is significantly less pronounced or absent near the solstices. During magnetically active periods the low-latitude topside ionosphere is modified due to vertical E x B plasma drifts in the predawn sector. The quiet time equinox observations are interpreted in terms of a diurnal flux tube filling model. It is suggested that the observed equatorial depletions result from a pair of plasma fronts that are moving upward from conjugate ionospheres and that are associated with the early stages of the postsunrise refilling process.},
doi = {10.1029/JA084iA08p04201},
journal = {J. Geophys. Res.; (United States)},
number = ,
volume = 84:A8,
place = {United States},
year = {1979},
month = {8}
}