Physics
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996jgr...101.5125a&link_type=abstract
Journal of Geophysical Research, Volume 101, Issue A3, p. 5125-5132
Physics
13
Ionosphere: Electric Fields, Ionosphere: Equatorial Ionosphere, Ionosphere: Ionospheric Irregularities, Ionosphere: Plasma Waves And Instabilities
Scientific paper
Vector electric field measurements from the San Marco D satellite are utilized to investigate the bifurcation of ionospheric plasma depletions (sometimes called ``bubbles'') associated with nightside equatorial spread F. These depletions are identified by enhanced upward E×B convection in depleted plasma density channels in the nighttime equatorial ionosphere. The in situ determination of the bifurcation process is based on dc electric field measurements of the bipolar variation in the zonal flow, westward and eastward, as the eastbound satellite crosses isolated signatures of updrafting plasma depletion regions. We also present data in which more complicated regions of zonal velocity variations appear as the possible result of multiple bifurcations of updrafting equatorial plasma bubbles.
Aggson Thomas L.
Laakso Harri
Maynard Nelson C.
Pfaff Robert F.
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