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Three-hour activity index based on power spectra estimation |
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| Authors: | J Reda J Jankowski |
| Institution: | Institute of Geophysics, Polish Academy of Sciences, ul. Ksi?cia Janusza 64,;Warsaw 01-452, Poland. E-mails: |
| Abstract: | |
| Keywords: | geomagnetic activity geomagnetism K indices solar wind |