Other
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm13a1645m&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SM13A-1645
Other
2407 Auroral Ionosphere (2704), 2706 Cusp, 2784 Solar Wind/Magnetosphere Interactions
Scientific paper
Ground observations of the optical aurora in the dayside cusp region have the distinct advantages of continuity of coverage and sufficient temporal-spatial sensitivity to monitor dayside signatures of solar wind/magnetosphere/ionosphere interaction mechanisms. The South Pole Station (SP, geomagnetic latitude (GMLat) = -74.3 degs, magnetic local time = UT-3.5 h) in Antarctica is a unique place for dayside aurora observations during austral winter season. We present the detailed features of enhancements of dayside aurora activity induced by a sudden increase in the solar wind dynamic pressure (Psw), using a ground-based all-sky imager (ASI) at SP. The interplanetary magnetic field (IMF) was northward during the Psw enhancement. Just after the arrival of the Psw enhancement on the Earth"fs magnetosphere, the 557.7 nm aurora activity on the dayside is suddenly intensified almost in the whole field of view of ASI. Further a few minutes later, the intensity of the auroral emissions shows a maximum, and then decays within about 5 minutes. Even after decay of the transient aurora activity at lower latitudes, the newly formed auroral emissions from the dayside cusp to the polar cap (GMLat -76 to -80 degs) develop during the Psw enhancement lasting about an hour. The polar aurora intensifications seem to be associated with lobe reconnection under the northward IMF conditions as well as the Psw enhancement. In this talk, two cases have been studied and the possible generation mechanisms will be discussed by comparing the ASI data at SP with other instruments.
Ebihara Yasuhiro
Kadokura Akira
Motoba Tetsuo
Sato Naoko
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