Starspots are created by local magnetic fields on the surfaces of stars, just as sunspots.
Their fields are strong enough to suppress the overturning convective motion and thus block …

A review of solar cycle prediction methods and their performance is given, including early
forecasts for Cycle 25. The review focuses on those aspects of the solar cycle prediction …

A review of solar cycle prediction methods and their performance is given, including
forecasts for cycle 24. The review focuses on those aspects of the solar cycle prediction …

Aims. We study the time variations in the cycles of 20 active stars based on decade-long
photometric or spectroscopic observations. Methods. A method of time-frequency analysis …

We analyze the light curve of the M5. 5 dwarf Proxima Centauri obtained by the Transiting
Exoplanet Survey Satellite (TESS) in Sectors 11 and 12. In the≈ 50 day long light curve we …

The retrodiction and prediction of solar activity are two closely-related problems in dynamo
theory. We applied Machine Learning (ML) algorithms and analyses to the World Data …

Historical sunspot records and the construction of a comprehensive database are among the
most sought after research activities in solar physics. Here, we revisit the issues and …

Aims. We study the different patterns of interannual magnetic variability in stars on or near
the lower main sequence, approximately solar-type (GK dwarf) stars in time series of 36 yr …

As more exoplanets are being discovered around ultracool dwarfs, understanding their
magnetic activity and the implications for habitability is of prime importance. To find stellar …

Context. Homogeneous photometric time series spanning decades provide a unique
opportunity to study the long-term cyclic behavior of active spotted stars such as our target EI …