Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm51d..01z&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SM51D-01
Physics
[2431] Ionosphere / Ionosphere/Magnetosphere Interactions, [2463] Ionosphere / Plasma Convection, [2475] Ionosphere / Polar Cap Ionosphere, [2790] Magnetospheric Physics / Substorms
Scientific paper
Substorms are one of the fundamental elements of geomagnetic activity, which involve complex magnetosphere-ionosphere coupling processes. In this work, we aim to better understand the evolution of high latitude ionospheric convection and the relevant current systems associated with substorms, with emphasis on these features near the nightside Harang reversal region. Three different types of radars, including the Super Dual Auroral Radar Network (SuperDARN) coherent-scatter radars, the new advanced modular incoherent-scatter radar at Poker Flat (PFISR), and the Sondrestrom ISR, have been utilized. Observations from these radars, together with those from complementary instruments, including satellites and other ground-based instruments, have enabled fundamental new understanding of the ionospheric electrodynamic properties associated with substorms. In this presentation, I focus on electrodynamics near the nightside Harang reversal region. Observations from the SuperDARN and the PFISR radars revealed that auroral activity at substorm onset is located near the center of the Harang reversal, which represents a key feature of magnetospheric and ionospheric convection and is part of the Region 2 system. The observations also show nightside convection flows exhibit repeatable, distinct variations at different locations relative to the substorm-related auroral activity. Taking advantage of the simultaneous flow and ionization measurements from PFISR, a current closure relation has been found between the Region 2 and the substorm field-aligned current systems. By synthesizing these observations, a 2-D comprehensive view of the nightside ionospheric electrodynamical features, including electrical equipotentials, flows and FACs, and their evolution associated with substorms has been constructed, which has revealed a strong coupling between the substorm and the Region 2 current systems. This study sheds new light on substorm-related magnetosphere-ionosphere coupling and contributes to the building of a holistic picture of the substorm dynamics.
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