Simultaneous observation of an auroral substorm at Antarctic stations and by the POLAR UVI

Details Simultaneous observation of an auroral substorm at Antarctic stations and by the POLAR UVI Simultaneous observation of an auroral substorm at Antarctic stations and by the POLAR UVI

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm51a0348k&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SM51A-0348

Physics

2407 Auroral Ionosphere (2704), 2704 Auroral Phenomena (2407), 2788 Storms And Substorms

Scientific paper

In 2003, there were considerable times for the POLAR UVI to observe global auroral activity in the southern hemisphere. We searched such periods that auroral substorms were observed simultaneously both at Japanese Antarctic stations, Syowa and Dome Fuji, and by the POLAR UVI. We analyzed one of such periods, 23-24 May, 2003. Our interest is to elucidate relation between the large scale features observed by the satellite and the small and meso-scale features observed on the ground. Syowa Station is located at auroral latitudes and Dome Fuji is at cusp latitudes. Black and white all-sky TV camera, multi-wavelength all-sky imager, meridian scanning photometer, zenith fixed photometer, and zenith fixed tilting filter proton auroral photometer were in operation at Syowa, and all-sky TV camera and all-sky color digital camera were at Dome Fuji. For the 23-24 May 2003 event, expansion phase onset of the substorm occurred around 23:40 UT on 23 May, and maximum poleward expansion appeared around 00:02 UT on 24 May. During the recovery phase, a discrete auroral form appeared around the poleward boundary, and a large-scale undulation of diffuse aurora (Omega band) appeared at lower latitudes. Within the diffuse region, a pulsating auroral activity was observed. The auroral activity receded into a very quiet state around 01:20 UT on 24 May. In our presentation, we will focus on the evolution of the pulsating auroral activity observed on the ground in the context of the global auroral substorm evolution observed by the POLAR UVI.

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