Deep depletions of total electron content associated with severe mid-latitude gigahertz scintillations during geomagnetic storms

Details Deep depletions of total electron content associated with severe mid-latitude gigahertz scintillations during geomagnetic storms Deep depletions of total electron content associated with severe mid-latitude gigahertz scintillations during geomagnetic storms

Jul 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....90.6652o&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 90, July 1, 1985, p. 6652-6656.

Physics

6

Ionospheric Electron Density, Magnetic Storms, Midlatitude Atmosphere, Night Sky, F Region, Japan, Scintillation, Time Response

Scientific paper

Using 136-MHz Faraday rotation data obtained at three closely spaced stations, evidence is presented that severe nighttime gigahertz scintillations, which appear rarely at mid-latitudes around Japan only during geomagnetic storm conditions, are closely associated with deep depletions of total electron content (TEC). The TEC depletions amount to 2-8 x 10 to the 16th el/sq (10-30 percent of the background (TEC), and their durations range from 10 min to 1 hour. These depletions move northeastward or eastward with velocities between 60 and 260 m/s. The depletions are probably not counterparts of the equatorial bubbles but seem to be formed in localized regions around Japan under complicated and peculiar ionospheric conditions. There is an indication that the oscillation of the F region caused by large-scale TID's propagating from north to south (approximately 600 m/s) may initiate the generation of the depletion.

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