A plasma bulk motion in the midnight magnetosphere during auroral breakup inferred from all-sky image and magnetic field observations at geosynchronous altitudes |
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| Institution: | 1. Department of Physics, Kurume National College of Technology, Kurume, Japan;2. National Institute for Space Research (INPE), Sao Jose dos Campos, Sao Paulo, Brazil;3. Department of Earth and Planetary Science, University of Tokyo, Tokyo, Japan;1. Physics Department, M.S. University of Baroda, Vadodara-390002, India;2. Chemistry Department, M.S. University of Baroda, Vadodara-390002, India;3. Nuclear Science Centre, Aruna Asaf Ali Marg, New Delhi-110067, India;1. Space and Geophysics Lab, Applied Research Laboratories, The University of Texas at Austin, F0252, Austin, TX 78758-4423, USA;2. Atmospheric and Space Technology Research Associates, 11118 Quail Pass, San Antonio, TX 78249, USA;3. Department of Physics and Astronomy, Rice University, 6100 S Main, Houston, TX, USA;1. Cooperative Institute for Research in Environmental Sciences, National Centers for Environmental Prediction National Weather Service, National Oceanic and Atmospheric Administration (NOAA), University of Colorado and Space Environment Center, 325 Broadway, Boulder, CO 80305-3337, USA;2. Radio Observatorio de Jicamarca, Instituto Geofisico del Peru, Peru;3. Space Environment Research Center, Kyushu University, Japan;4. Indian Institute of Geomagnetism, India;1. Institute of Solar–Terrestrial Physics, PO Box 4026, 664033 Irkutsk, Russian Federation;2. Institute of the Physics of the Earth, Moscow, Russia;3. Augsburg College, Minneapolis, USA;4. British Antarctic Survey, Cambridge, UK |
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| Abstract: | Auroral events that occurred on January 24, 1986 in central Canada were recorded by an all-sky TV imager. During these events, auroral breakup was confined to a region between two foot points of neighboring geosynchronous satellites, GOES5 and GOES6. We examined field line signatures at satellite locations in unique station distributions and concluded that field line observation indicated plasma motion in the equatorial plane. The plasma motion showed an earthward compression combined with bifurcation (duskward or dawnward displacement in dusk/dawn sectors). In addition, we were able to infer an elliptical circulation of plasmas in the equatorial plane at Pi2 periods. Appearance in opposite rotation beside the auroral region indicated excitation of surface waves. We were able to show that auroral breakups occurred at a meridian of bifurcation. We suggest that a high plasma pressure region occurring tailward of geosynchronous altitudes may drive those plasma motions. |
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