Outflow of cold dense plasma associated with variation of convection in the outer magnetosphere |
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| Institution: | 1. Space Science Center, University of New Hampshire, Morse Hall, Durham, NH 03824, USA;2. Department of Earth and Planetary Physics, University of Tokyo, Tokyo, Japan;3. Institute of Space and Astronautical Science, Japan;4. Radio Atmospheric Science Center, Kyoto University, Kyoto, Japan;1. High Altitude Observatory, National Center for Atmospheric Research, Boulder, CO, United States;2. Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China;3. College of Earth Sciences, University of the Chinese Academy of Sciences, Beijing, China;1. National Institute for Space Research (INPE), Sao Jose dos Campos, Brazil;2. Federal University of Goias, Jatai, Brazil;3. Federal University of Jataí (UFJ), Jataí, Brazil |
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| Abstract: | Cold dense plasma with the ionospheric origin is often observed in the outer magnetosphere with L values as large as 10. We have examined the electric field data accompanied by the cold dense plasma. The electric field data are obtained by the direct measurement of the drift motion of electrons released from electron guns. We get westward components of convection. In addition, there is an AC component of electric field in the ULF range larger than the DC component. If such a large variation of electric field exists in the vicinity of the stagnation point, the plasmaspheric plasma is expected to flow away to the outer magnetosphere. Then we have a test particle simulation by adding a potential variable in time. There is a particle outflow accompanied by the AC variation of electric field in the ULF range. If there are more complicated variations of electric field, it is possible that particles flow out frequently. |
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