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Open Geosciences

formerly Central European Journal of Geosciences

Editor-in-Chief: Jankowski, Piotr

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2391-5447
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Variations in solar and geomagnetic activity with periods near to 1.3 year

Jaroslav Střeštïk
Published Online: 2009-06-01 | DOI: https://doi.org/10.2478/v10085-009-0010-y

Abstract

It is known that solar wind velocity fluctuates regularly with a period of about 1.3 years. This periodicity (and other signals with periods near to 1.1 and 0.9 years) has also been observed in biological data. The variation is a temporary feature, mostly being observed in the early 1990s. Here, the occurrence of these periodic signals in solar and geomagnetic activity between 1932 and 2005 has been investigated. The signal with 1.3 year period is present in geomagnetic activity only in a short interval after 1990 and to a lesser extent around 1942. At other times the signal is very weak or not present at all. Other periods are much lower amplitude and appear only sporadically throughout the time investigated. A connection between these periods and solar cycles (e.g. different even or odd cycles) has not been proven. It is possible that there is a long-term periodicity in the occurrence of the 1.3 year period but the time series data available is insufficient to confirm this. There are no such periodicities in solar activity. In order to gain a greater understanding of these periodic signals, we should search for their origin in interplanetary space.

Keywords: transyear variation; geomagnetic activity; solar activity; wavelet analysis

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About the article

Published Online: 2009-06-01

Published in Print: 2009-06-01


Citation Information: Open Geosciences, Volume 1, Issue 2, Pages 152–156, ISSN (Online) 2391-5447, DOI: https://doi.org/10.2478/v10085-009-0010-y.

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© 2009 Versita Warsaw. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. BY-NC-ND 3.0

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