long-term variations in the geomagnetic activity level part ii: ascending phases of sunspot cycles
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ID: 213547
1994
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Abstract
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 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.
| Reference Key |
mussino1994annaleslong-term
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|---|---|
| Authors | ;V. Mussino;O. Borello Filisetti;M. Storini;H. Nevanlinna |
| Journal | journal of food measurement and characterization |
| Year | 1994 |
| DOI |
10.1007/s00585-994-1065-5
|
| URL | |
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