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Variations in solar and geomagnetic activity with periods near to 1.3 year
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SYSNO ASEP 0330243 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Variations in solar and geomagnetic activity with periods near to 1.3 year Author(s) Střeštík, Jaroslav (GFU-E) RID Source Title Central European Journal of Geosciences - ISSN 2081-9900
Roč. 1, č. 2 (2009), s. 152-156Number of pages 5 s. Language eng - English Country PL - Poland Keywords transyear variation ; geomagnetic activity ; solar activity ; wavelet analysis Subject RIV DE - Earth Magnetism, Geodesy, Geography R&D Projects IAA300120608 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR) CEZ AV0Z30120515 - GFU-E (2005-2011) UT WOS 000208419900002 EID SCOPUS 67651043275 DOI 10.2478/v10085-009-0010-y Annotation 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. Workplace Geophysical Institute Contact Hana Krejzlíková, kniha@ig.cas.cz, Tel.: 267 103 028 Year of Publishing 2010
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