Power-spectrum analysis of local geomagnetic disturbances and their relationship to cosmic-ray and aurora intensity |
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| Authors: | H Mavromichalaki A Belehaki Y Liritzis |
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| Institution: | (1) Physics Department, Nuclear and Particle Physics Section, University of Athens, Solonos 104, 10680, Greece;(2) Department of Geophysics, University of Edinburgh, Scotland, U.K. |
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| Abstract: | Power-spectrum analyses have been carried out on two data sets of the geomagnetic K-index from the Athens and Sofia magnetic Observatories. For the period between 1956–1984, periodicities of about 2.8 and 6 months have been obtained. Similar results were found by the auto-correlation technique. Both periods are significant to 0.05 and 0.01 level, respectively. In our attempt to explain transient geomagnetic disturbances caused by other parameters, the K-index was correlated to cosmic-ray and aurora intensity. The best correlation coefficient between K-variations and cosmic-ray data from Athens Neutron-Monitor Station was 0.58 and between K-index and Auroral, activity index was 0.47.An attempt to interpret these periodicities and relationships has been made. |
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