HR: 1330h
AN: SH42B-0541    [PDF]
TI: Solar Activity Explored With Wavelet Methods
AU: * Lundstedt, H -
EM: henrik@lund.irf.se
AF: Swedish Institute of Space Physics, Scheelev. 17, Lund, - SE-223 70 Sweden
AU: Liszka, L -
EM: ludwik@irf.se
AF: Swedish Institute of Space Physics, SLU, Ume\aa, - SE-901 83 Sweden
AU: Lundin, R -
EM: rickard@irf.se
AF: Swedish Institute of Space Physics, Box 812, Kiruna, - SE-981 28 Sweden
AU: Wintoft, P -
EM: peter@lund.irf.se
AF: Swedish Institute of Space Physics, Scheelev. 17, Lund, - SE-223 70 Sweden
AB: 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.
UR: http://www.lund.irf.se
DE: 3220 Nonlinear dynamics
DE: 7524 Magnetic fields
DE: 7534 Radio emissions
DE: 7536 Solar activity cycle (2162)
DE: 7538 Solar irradiance
SC: SPA - Solar and Heliospheric Physics [SH]
MN: 2003 Fall Meeting