Abstract
A simple recurrence index for geomagnetic activity is constructed and index values are derived for a 110 yr period using Mayaud’s aa-index. The results show a strong response every 11 yr, just before the minimum epoch of the 11 yr sunspot cycle. However, the strongest response (in terms of the duration, not amplitude) is shown to occur during alternate sunspot cycles each 22 yr, and in step with the American high plains droughts and other climate extremes.
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References
J. Bartels, Terrestrial Magnetism and Atmospheric Electricity, 37, 1, 1932.
P. N. Mayaud, A Hundred Year Series of Geomagnetic Data 1868–1967, IAGA Bulletin No. 33, Meppel, Holland, 1973.
W. O. Roberts, Possible Relationships Between Solar Activity and Meteorological Phenomena, NASA SP-366, NASA, Washington, D.C., 1975.
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© 1979 D. Reidel Publishing Company, Dordrecht, Holland
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Sargent, H.H. (1979). A Geomagnetic Activity Recurrence Index. In: McCormac, B.M., Seliga, T.A. (eds) Solar-Terrestrial Influences on Weather and Climate. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-9428-7_10
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DOI: https://doi.org/10.1007/978-94-009-9428-7_10
Publisher Name: Springer, Dordrecht
Print ISBN: 978-94-009-9430-0
Online ISBN: 978-94-009-9428-7
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