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JOURNAL OF GEOPHYSICAL RESEARCH,
VOL. 114,
A11302,
7 PP., 2009
doi:10.1029/2009JA014369
Formation of a plasma depletion shell in the equatorial ionosphere
Johns Hopkins University Applied Physics Laboratory, Laurel, Maryland, USA
W. B. Hanson Center for Space Sciences, University of Texas at Dallas, Richardson, Texas, USA
Johns Hopkins University Applied Physics Laboratory, Laurel, Maryland, USA
Space Environment Laboratory, Incorporated, Seoul, South Korea
An accurate description of the irregularity region defined by a plasma bubble is critically important in understanding the dynamics of the region and its effects on radio scintillation. Here we describe a plasma depletion region as a “depletion shell” and show how two-dimensional optical images from space can be used to define the shape of the depletion shell. Our simple model calculation demonstrates that the space-based optical observation can detect the plasma-depleted magnetic flux tubes only near the F-peak height. The backward C-shape in bubble images from optical observations is the trace of the plasma depletion shell near the F-peak height. The westward tilt of bubbles at the magnetic equator can also be explained by this shell structure. The in situ measurement of the ion velocity at night in the topside shows the decrease of the eastward plasma drift with an increase of latitude. The formation of the plasma depletion shell is consistent with the latitudinal/altitudinal shear in the zonal plasma flow.
Received 17 April 2009; accepted 2 July 2009; published 3 November 2009.
Citation: (2009), Formation of a plasma depletion shell in the equatorial ionosphere, J. Geophys. Res., 114, A11302, doi:10.1029/2009JA014369.
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