Physics
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsa11b..01a&link_type=abstract
American Geophysical Union, Fall Meeting 2005, abstract #SA11B-01
Physics
0355 Thermosphere: Composition And Chemistry, 2411 Electric Fields (2712), 2427 Ionosphere/Atmosphere Interactions (0335), 2431 Ionosphere/Magnetosphere Interactions (2736), 3369 Thermospheric Dynamics (0358)
Scientific paper
Any models attempting to describe the structure of the thermosphere, the ionosphere, the plasmasphere, the inner magnetosphere and the ring current are dependent on the spatial and temporal distribution of the magnetospheric electric fields. As the inner magnetosphere is coupled to the subauroral ionosphere via magnetic field lines, the magnetospheric electric field structure is in turn dependent on the ionospheric electrodynamics. Electric fields influence numerous processes in the ionosphere/thermosphere (IT) system including plasma transport in the ionosphere, the ion drag force which affects neutral winds, and the Joule heating which drives much of the composition and structure of the IT system. These electric fields can extend to very low latitudes and can contribute substantially to the magnetospheric electric field structure, particularly during geomagnetic storms. The subauroral electric fields are known to reduce the ionospheric conductivity through fast chemistry and transport which produces a feedback mechanism into the magnetosphere through coupling along magnetic field lines further increasing the magnetospheric electric fields. They modify the plasmaspheric structure and drive the plasmasphere/electron plasmasheet interface (the plasmapause) inward. They are also extremely important to ring current formation and decay in that they enhance ring current formation during the storm main phase and slow storm recovery by providing a mechanism for transport of ring current particles to low L-values. We will discuss the subauroral electric field phenomena and the effect of the high latitude and subauroral electric fields on the thermosphere and their coupling to the magnetosphere.
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