Solar Activity Explored With Wavelet Methods

Details Solar Activity Explored With Wavelet Methods Solar Activity Explored With Wavelet Methods

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsh42b0541l&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SH42B-0541

Physics

3220 Nonlinear Dynamics, 7524 Magnetic Fields, 7534 Radio Emissions, 7536 Solar Activity Cycle (2162), 7538 Solar Irradiance

Scientific paper

In order to improve the forecasting 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. 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 advanced wavelet methods. Ampligrams and time scale spectra are shown. The processes behind the variability are discussed. New modes of solar magnetic variability are found. The amplitude of solar magnetic activity, as indicated by the sunspot number, has not only increased since 1850 but the modes have also varied since 1850 up till present. A dramatic change is taking place around 1940. Finally, the future evolution of the solar activity is discussed.

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