Physics
Scientific paper
Jun 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995jatp...57..805c&link_type=abstract
Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 57, no. 7, p. 805-812
Physics
1
Electric Fields, Field Aligned Currents, Geomagnetism, Ionospheric Currents, Ionospheric Drift, Magnetosphere-Ionosphere Coupling, Plasmasphere, Pressure Gradients, Dynamo Theory, Electron Density Profiles, Ion Density (Concentration), Magnetic Storms, Velocity Distribution
Scientific paper
Global scale longitudinal gradients of pressure in the plasmasphere may be formed naturally by ionospheric processes, or caused by electrostatic fields of ionospheric dynamo origin. It is shown that plasmaspheric gradients of pressure, orthogonal both to the magnetic field (B) and to grad B, generate geophysically significant field-aligned currents. Considering the ionosphere and plasmasphere as a coupled electrodynamic system, these currents alter non-negligibly the self-consistent ionospheric electric field and current. Criteria are established for this coupling mechanism (a kind of plasmaspheric impedance) to be significant. This has implications for the relationships of ionospheric electric fields and currents, F-region drifts, and magnetic variations, due to upper atmosphere tides and winds.
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