Geomagnetic field variation and the equivalent current system generated by an ionospheric dynamo at the solstice |
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| Affiliation: | 1. Utah State University, Logan, UT, 87545, USA;2. University of Colorado at Boulder, Boulder, CO, 80302, USA;3. Delft University of Technology, Delft, The Netherlands;4. National Centre for Space Studies (CNES), Toulouse, France;1. Pwani University, School of Pure and Applied Sciences, Department of Mathematics and Physics, P.O. Box 195-80108, Kilifi, Kenya;2. Department of Physics, Lancaster University, Lancaster, UK;3. South African National Space Agency, Space Science Directorate, P.O. Box 32, Hermanus, South Africa;4. Kenya Technical University, School of Pure and Applied Sciences, Department of Physics, P.O. Box 52428-00200, City Square, Nairobi, Kenya;5. Department of Physics, Catholic University of America, Washington, DC 20064, USA;6. NASA Goddard Space Flight Center, Greenbelt, MD 20770, USA;7. Department of Physics University of Nairobi, P.O. Box 30197, GPO, Nairobi, Kenya;1. Department of Atmospheric and Space Science, Savitribai Phule Pune University, Pune, India;2. Birkeland Centre for Space Science, University of Bergen, Bergen, Norway;3. GATS, Inc., Boulder, CO, USA |
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| Abstract: | The geomagnetic field variation and equivalent current system produced by an asymmetrical ionospheric dynamo action under a solstitial condition are simulated and compared with the observational results. Results of our simulation reproduce well most of the observational features of the solstitial Sq system. For example, the latitude of the current vortex center is higher in summer than in winter and the local time of the center in the summer hemisphere is located earlier than that in the winter hemisphere. In the morning and afternoon sector the current vortex in the summer hemisphere invades the winter hemisphere. The first feature is attributed to the ionospheric currents, but the second and third features are due to the field-aligned currents generated by the asymmetry of the ionospheric dynamo. |
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