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Field-aligned plasma diffusive fluxes in the topside ionosphere from radio occultation measurements by CHAMP
Authors:Guang-ming Chen  Jiyao Xu  Wenbin Wang  Jiuhou Lei  Yue Deng
Institution:1. State Key Laboratory of Space Weather, Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing 100190, China;2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China;3. High Altitude Observatory, National Center for Atmospheric Research, Boulder, CO 80307, USA;4. Department of Aerospace Engineering Sciences, University of Colorado, Boulder, CO 80309, USA;1. Department of Chemical and Environmental Sciences, Materials and Surface Science Institute, University of Limerick, Limerick, Ireland;2. Department of Applied Chemistry, Building Los Acebos, Public University of Navarra, Campus of Arrosadia, E-31006 Pamplona, Spain;1. School of Mathematics and Statistics, Nanjing University of Information Science & Technology, Nanjing 210044, China;2. National Center for Space Weather, China Meteorological Administration, Beijing 100081, China;3. Guangzhou Meteorological Satellite Ground Station, Guangzhou 510640, China;4. School of Electronic Information, Wuhan University, Wuhan 430072, China
Abstract:O+ field-aligned diffusive velocities and fluxes in the topside ionosphere have been calculated from electron density profiles retrieved from CHAMP radio occultation (RO) measurements. The velocities and fluxes from January 2002 to December 2003 at low- and mid-latitudes have been statistically analyzed. The results show that daytime diffusive fluxes changed gradually from downward to upward as altitude increases. The largest values of the upward diffusive fluxes and velocities occurred at around ±25° geomagnetic latitude. During solstices the plasma fluxes in the winter hemisphere were larger than those in the summer hemisphere.
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