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Solar activity explored with new wavelet methods

Lundstedt, Henrik LU ; Liszka, L and Lundin, R (2005) In Annales Geophysicae 23(4). p.1505-1511
Abstract
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... (More)
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. (Less)
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author
publishing date
type
Contribution to journal
publication status
published
subject
keywords
space plasma physics, astrophysics and astronomy, solar physics, interiors and dynamo theory, magnetic fields, stellar, nonlinear phenomena
in
Annales Geophysicae
volume
23
issue
4
pages
1505 - 1511
publisher
European Geosciences Union
external identifiers
  • wos:000231705500037
  • scopus:23744446556
ISSN
1432-0576
language
English
LU publication?
no
id
f317800c-7783-4ab1-88cd-eed7bca8795e (old id 225104)
date added to LUP
2007-10-05 08:32:57
date last changed
2017-01-01 05:00:55
@article{f317800c-7783-4ab1-88cd-eed7bca8795e,
  abstract     = {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.},
  author       = {Lundstedt, Henrik and Liszka, L and Lundin, R},
  issn         = {1432-0576},
  keyword      = {space plasma physics,astrophysics and astronomy,solar physics,interiors and dynamo theory,magnetic fields,stellar,nonlinear phenomena},
  language     = {eng},
  number       = {4},
  pages        = {1505--1511},
  publisher    = {European Geosciences Union},
  series       = {Annales Geophysicae},
  title        = {Solar activity explored with new wavelet methods},
  volume       = {23},
  year         = {2005},
}