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| Titel |
Solar activity explored with new wavelet methods |
| VerfasserIn |
H. Lundstedt, L. Liszka, R. Lundin |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 23, no. 4 ; Nr. 23, no. 4 (2005-06-03), S.1505-1511 |
| Datensatznummer |
250015240
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| Publikation (Nr.) |
 copernicus.org/angeo-23-1505-2005.pdf |
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| Zusammenfassung |
| In order to improve the forecasts of the impact of solar activity on the
terrestrial environment on time scales longer than days, improved
understanding and forecasts of the solar activity are needed. The first
results of a new approach of modelling and forecasting solar activity are
presented. Time series of solar activity indicators, such as sunspot number,
group sunspot number, F10.7, E10.7, solar magnetic mean field, Mount Wilson
plage and sunspot index, have been studied with new wavelet methods;
ampligrams and time-scale spectra. Wavelet power spectra of the sunspot
number for the period 1610 up to the present show not only that a dramatic increase in
the solar activity took place after 1940 but also that an interesting change
occurred in 1990. The main 11-year solar cycle was further studied with
ampligrams for the period after 1850. time-scale spectra were used to examine
the processes behind the variability of the solar activity. Several
interesting deterministic and more stochastic features were detected in the
time series of the solar activity indicators. The solar nature of these
features will be further studied.
Keywords. Solar physics, astrophysics and astronomy
(Magnetic fields; Stellar interiors and dynamo theory) –
Space plasma physics (nonlinear phenomena) |
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