The vernal-autumnal asymmetry in the seasonal variation of geomagnetic activity |
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| Affiliation: | 1. Barcelona Institute for Global Health, ISGlobal, Barcelona, Spain;2. Universitat Pompeu Fabra, Barcelona, Spain;3. CIBER Epidemiología y Salud Pública, Madrid, Spain;4. Public Health Foundation of India, New Delhi, India;5. National Institute of Nutrition, Indian Council of Medical Research, Hyderabad, India;6. Department of Environmental Health Engineering, Sri Ramachandra University (SRU), Chennai, India;7. Department of Civil and Environmental Engineering, University of Washington, Seattle, WA, USA;8. Department of Non-communicable Disease Epidemiology, London School of Hygiene and Tropical Medicine, London, United Kingdom;1. Instituto de Geología, Universidad Nacional Autónoma de México, 04510, México DF, Mexico;2. Posgrado en Ciencias de la Tierra, Universidad Nacional Autónoma de México, 04510, México DF, Mexico;3. French Institute of Pondicherry, 11, St. Louis Street, Pondicherry, 605001, India;1. Division of Neurosurgery, University of Toronto, Toronto, ON M5T 2S8, Canada;1. Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China;2. University of Chinese Academy of Sciences, Beijing, China |
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| Abstract: | In intervals in which the polarity of the main solar dipole field is stabilized, a 12 month wave occurs in geomagnetic activity (indices aa, Ap, Dst) with its maximum in one of the equinoctial periods. Whether the vernal or the autumnal maximum is greater depends on the polarity of the main solar dipole; the existence of the wave may be explained by the north-south asymmetry in the main solar dipole field. The results favour the southward component of the interplanetary magnetic field as the decisive factor for geomagnetic activity. |
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