Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa34a..07e&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SA34A-07
Physics
[2431] Ionosphere / Ionosphere/Magnetosphere Interactions, [2443] Ionosphere / Midlatitude Ionosphere, [2730] Magnetospheric Physics / Magnetosphere: Inner, [2778] Magnetospheric Physics / Ring Current
Scientific paper
The plasmasphere boundary layer (PBL) is a region of dynamic interactions between the subauroral ionosphere and the ring current influenced portions of the inner magnetosphere. Within this interaction zone, coupling currents during disturbance times lead to significant cross-field ion flows which can provide an important source of cold ionospheric O+ ions to the noontime cusp region. The delivery of these O+ ions is a hallmark of magnetosphere-ionosphere coupling and may form a critical source for upwelling and/or outflow processes which deliver material detected in the plasma sheet and other magnetospheric regions. We describe statistical and event characterizations of horizontal ion flux in the subauroral American longitude sector using large databases of incoherent scatter radar observations. When combined with satellite measurements of near topside density, GPS total electron content maps, and convection flow patterns using HF radar, the results highlight the crucial role played by the subauroral polarization stream in delivering a regulated horizontal ion flux of more than 1E14 ions/m^2-sec to the cusp. Flux levels have a well defined MLT dependence which is nearly invariant to ring current strength as monitored by the DsT index. Additionally, we will describe several key characteristics of ion fluxes observed near the sunset terminator. In particular, observed cross-field flows oppose corotation in a 2 to 4 hour MLT window, helping to keep SAPS-entrained plasma fixed in an inertial frame.
Beroz F.
Erickson Phil J.
Foster Christopher J.
Miskin M. Z.
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