Whether or not the upcoming cycle 24 of solar activity will be strong is being hotly debated. The solar cycle is produced by a complex dynamo mechanism. We model the last few solar cycles by "feeding" observational data of the Sun's polar magnetic field into our solar dynamo model. Our results fit the observed sunspot numbers of cycles 21-23 reasonably well and predict that cycle 24 will be abo...

Context. Solar cycles vary in their amplitude and shape. There are several empirical relations between various parameters linking cycle’s shape and amplitude, in particular the Waldmeier relations. Aims. As solar cycle is believed to be a result of the solar dynamo action, these relations require explanation in the framework of this theory. Here we aim to present a possible explanation of such ...

In this paper, the recent improvement of the Wolf sunspot time–series by Hoyt and co-workers has been analysed with the Global Flow Reconstruction (GFR) method (Serre et al. 1996a and b). A nonlinear 4–dimensional chaotic model has been extracted from the data which captures the principal characteristic features of the sunspot group time–series. The hypothesis of interactions between magnetic m...

The Sun encompasses planet Earth, supplies the heat that warms it, and even shakes it. The United Nation’s Intergovernmental Panel on Climate Change (IPCC) assumed that solar influence on Earth’s climate is limited to changes in solar irradiance and adopted the consensus opinion of a hydrogen-filled Sun—the Standard Solar Model (SSM). They did not consider the alternative solar model and instea...