Physics
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsa12a..07m&link_type=abstract
American Geophysical Union, Fall Meeting 2005, abstract #SA12A-07
Physics
2435 Ionospheric Disturbances, 2720 Energetic Particles: Trapped, 2788 Magnetic Storms And Substorms (7954), 3369 Thermospheric Dynamics (0358)
Scientific paper
During magnetic storms ring-current (RC) ions enter into previously forbidden parts of the plasmasphere. Whenever the RC plasma pressure gradient has a component in the direction of the [B× ∇ B] drift, field-aligned currents (FACs) flow into/from the conjugate ionosphere. Region 2 current continuity leads to the formation of intense polarization electric fields in the low-conductance nightside ionosphere at subauroral latitudes that drive enhanced westward convection, known as subauroral polarization streams (SAPS). Injections of RC particles are followed by strong SAPS-wave structures (SAPSWS), which collocate with suprathermal electrons and ions, elevated electron temperatures, and irregular plasma density troughs. We propose a generation mechanism of SAPSWS and elevated electron temperatures during RC injections into the plasmasphere. It includes current convective and lower-hybrid drift instabilities near the ring current's inner edge. This scenario is consistent with the CRRES and DMSP observations during the SAPSWS events.
Burke William J.
Mishin Evgeni V.
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