Physics
Scientific paper
Aug 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84.4251a&link_type=abstract
Journal of Geophysical Research, vol. 84, Aug. 1, 1979, p. 4251-4256.
Physics
13
Earth Ionosphere, Equatorial Atmosphere, Plasma Dynamics, Vertical Motion, Bubbles, Ionospheric Electron Density, Ionospheric Ion Density, Magnetic Flux, Photoionization, Plasma Conductivity, Plasma Diffusion, Taylor Instability, Time Functions
Scientific paper
Depleted plasma regions in the equatorial ionosphere and their associated motions observed by ground-based, rocket-borne, and satellite instruments are considered. Various theories were proposed for the formation and motion of these bubbles, and realizing that bubbles are depleted magnetic flux tubes, the vertical E times B motion of depleted regions was investigated incorporating flux tube integrated quantities of electron content and Pedersen conductivity. The results show that the vertical bubble velocity as a function of time critically depends on the background ionospheric electric field, and that this dependence extends to greater k lengths than previously thought. It was shown that bubbles initiated at 350-km altitude with a 5% depletion in electron content attain an upward velocity of 200 m/s at 1920 LT when the background electric field is 0.6 mV/m.
Anderson Dale N.
Haerendel Gerhard
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