Long-term variations in the geomagnetic activity level. Part 2: Ascending phases of sunspot cycles

Details Long-term variations in the geomagnetic activity level. Part 2: Ascending phases of sunspot cycles Long-term variations in the geomagnetic activity level. Part 2: Ascending phases of sunspot cycles

Nov 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994angeo..12.1065m&link_type=abstract

Annales Geophysicae (ISSN 0992-7689), vol. 12, no. 10-11, p. 1065-1070

Physics

5

Earth Magnetosphere, Geomagnetism, Magnetic Effects, Solar Terrestrial Interactions, Sunspot Cycle, Sunspots, Correlation, Indexes (Ratios), Solar Physics

Scientific paper

Monthly averages of the Helsinki Ak-values have been reduced to the equivalent aa-indices to extend the aa-data set back to 1844. A periodicity of about five cycles was found for the correlation coefficient (r) between geomagnetic indices and sunsport numbers for the ascending phases of sunspot cycles 9 to 22, confirming previous findings based on a minor number of sunspot cycles. The result is useful to researchers in topics related to solar-terrestrial physics, particularly for the interpretation of long-term trends in geomagnetic activity during the past, and to forecast geomagnetic activity levels in the future.

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