Power spectrum of geomagneticK p-index detected at Misallat magnetic station |
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Authors: | A. A. Galal H. A. Deebes Maha S. Quassim Shahinaz Yousef |
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Affiliation: | (1) Egyptian National Research Institute of Astronomy & Geophysics, Egypt;(2) Astronomy Dept., Faculty of Science, Cairo University, Egypt |
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Abstract: | TheKp-indices measured at Misallat station [ø = 29°45 N; = 30°54 E] during the period 1958–1989, have been compared with the data of two geomagnetic stations; one of them has similar longitude as Misallat and the second has almost similar latitude. The spectra of daily and hourly data of the three stations are compared together to define the latitude and longitude-effects on the detected periodicities. Daily periodicities ofKp-index activities at the values 32.7, 21.2, 12.9, 11.6 and 9.2 days have been obtained to be common in the spectra of the three stations. The existence of 5-days periodicity in these stations has also been detected. |
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