The effect of geomagnetic activity on north polar currents in winter |
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| Institution: | 1. Department of Biological Sciences, National University of Singapore, 10 Kent Ridge Road, Singapore 117543, Republic of Singapore;2. Natural Sciences and Science Education, National Institute of Education, Nanyang Technological University, 1 Nanyang Walk, Singapore 637616, Republic of Singapore;3. The Tropical Marine Science Institute, National University of Singapore, Kent Ridge, Singapore 119227, Republic of Singapore |
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| Abstract: | Average north polar currents for the winter season have been derived from geomagnetic hourly means at six levels of geomagnetic activity. The twin-vortex pattern, normally associated with more disturbed conditions, persisted even on the quietest (mean Ap ≈ 1) days. When Ap increased to 24, the Harang discontinuity appeared earlier by about 3.5 h, though the current system as a whole remained unchanged in orientation. The average quiet day seems to be associated with a weak IMF oriented northwards and towards the Sun, with a low solar wind velocity and low proton temperature. |
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