Other
Scientific paper
Apr 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989em%26p...45....1m&link_type=abstract
Earth, Moon, and Planets (ISSN 0167-9295), vol. 45, April 1989, p. 1-15.
Other
4
Auroras, Cosmic Rays, Geomagnetism, Power Spectra, Solar Terrestrial Interactions, Autocorrelation, Magnetic Storms, Periodic Variations, Solar Activity Effects
Scientific paper
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.
Belehaki Anna
Liritzis Yiannis
Mavromichalaki Helen
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