Long-term variations in the geomagnetic activity level Part II: Ascending phases of sunspot cycles
Item
Title (Dublin Core)
Long-term variations in the geomagnetic activity level Part II: Ascending phases of sunspot cycles
Description (Dublin Core)
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 (<i>r</i>) between geomagnetic indices and sunspot 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.
Creator (Dublin Core)
Mussino, V.
Borello Filisetti, O.
Storini, M.
Nevanlinna, H.
Date (Dublin Core)
2018-09-27
Type (Dublin Core)
Text
Format (Dublin Core)
application/pdf
Identifier (Dublin Core)
10.1007/s00585-994-1065-5
https://angeo.copernicus.org/articles/12/1065/1994/
Source (Dublin Core)
eISSN: 1432-0576
Language (Dublin Core)
eng
