Time variation of instantaneous equivalent Sq current system |
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| Affiliation: | 1. Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai, 200030, China;2. University of Chinese Academy of Sciences, Beijing, 100049, China;3. School of Remote Sensing and Geomatics Engineering, Nanjing University of Information Science and Technology, Nanjing, 210044, China;1. Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;2. Mohe National Observatory of Geophysics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;3. Innovation Academy for Earth Science, Chinese Academy of Sciences, Beijing 100029, China;4. College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;5. School of Atmospheric Sciences, Sun Yat-Sen University, Zhuhai Guangdong 519082, China;1. Helmholtz Centre Potsdam, GFZ German Research Centre for Geosciences, Telegrafenberg, 14473 Potsdam, Germany;2. Department of Space Physics, College of Electronic Information, Wuhan University, 430079 Wuhan, China;3. Copernicus Gesellschaft e.V., 37081 Göttingen, Germany;1. COSMIC Program Office, University Corporation for Atmospheric Research, Boulder, CO 80301, USA;2. West Department of IZMIRAN, 41 Ave Pobeda, Kaliningrad 236010, Russia |
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| Abstract: | We have examined the time variation of the instantaneous equivalent Sq current system during 1–18 March 1980, by removing the averaged UT variation caused by the difference between geographic and geomagnetic coordinate systems. The additional current system thus obtained shows several typical patterns which explain the variation field. Some of them may be explained by the IMF polarity effect or by the geomagnetic disturbance field of polar origin, but others appear to be caused by the variation of the ionospheric dynamo. The latter lasts for several hours or sometimes for over ten hours and may be explained by the variation of diurnal or semi-diurnal tidal winds. |
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