Gumbel first distribution is applied to smoothed monthly mean sunspot numbers for solar cycles 10 to 24. According to that, the next minimum for solar cycle 24-25 transition would be the deepest solar minimum of the last ...

Solar variability is controlled by the internal dynamo which is a non-linear system. We develop a physical-statistical method for forecasting solar activity that takes into account the non-linear character of the solar ...

The long term solar activity dependencies of ionospheric F1 and F2 regions’ critical frequencies (f0F1 and f0F2) are analyzed for the last four solar cycles (1976–2015). We show that the ionospheric F1 and F2 regions have ...

In a recent study, a tree-ring oxygen isotope record (1800–2013) was used as a proxy for Amazon River discharge in order to investigate a solar influence on this river. Here we reinterpreted the results from this study by ...

In this paper, we study solar magnetic activity by means of a complex network approach. A complex network was built based on information on the space and time evolution of sunspots provided by image recognition algorithms ...

The planetary hypothesis of solar cycle is an old idea by which the planetary gravity acting on the Sun might have a non-negligible effect on the solar magnetic cycle. The advance of this hypothesis is based on phenomenological ...