Physics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsa44a..03k&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SA44A-03
Physics
2712 Electric Fields (2411), 2721 Field-Aligned Currents And Current Systems (2409), 2736 Magnetosphere/Ionosphere Interactions (2431), 2760 Plasma Convection (2463), 2788 Magnetic Storms And Substorms (7954)
Scientific paper
SuperDARN Hokkaido HF radar, capable of measuring the subauroral ionospheric plasma convection especially during storms, has been in continuous operation since the beginning of December 2006. Dayside merging flow, overshielding flow, and SAPS/SAID have been successfully observed during storms so far. As an excellent example of Hokkaido radar's contributions, we report the first two-dimensional observation of a dynamic variation of convection flow reversal in subauroral postmidnight sector during the storm main phase on 29 January 2007. The flow reversal region is extended over 20 deg in longitude and 5 deg in latitude, lasting for about 10-15 min, and the maximum flow speed is about 0.5-1.0 km/s. The flow reversal structure is reasonably reproduced by the ring current simulation coupled with the ionosphere, suggesting that it is produced by the region 2 field-aligned current associated with the ring current enhancement during the storm main phase. The dynamic variation of the flow reversal structure is interpreted as a transient eastward extension of the elongated dusk convection cell to the postmidnight and equatorward of the dawn cell, associated with the variation of the ring current whose structure is controlled by the interplanetary magnetic field and solar wind dynamic pressure. It is suggested that the ring current variation is highly coupled with the interplanetary parameters and is much more complicated than ever thought.
Ebihara Yasuhiro
Hosokawa Kazuo
Kataoka Ryuho
Kikuchi Tatsuru
Miyoshi Yasunobu
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