The Sun and other stars are magnetic: magnetism pervades their interiors and affects their
evolution in a variety of ways. In the Sun, both the fields themselves and their influence on …

The current understanding of astrophysical magnetic fields is reviewed, focusing on their
generation and maintenance by turbulence. In the astrophysical context this generation is …

Aims. Solar Orbiter, the first mission of ESA's Cosmic Vision 2015–2025 programme and a
mission of international collaboration between ESA and NASA, will explore the Sun and …

While the strong anticorrelation between chromospheric activity and age has led to the
common use of the Ca ii H and K emission index (R^{\prime} _ {\mathrm {HK}\,}= L …

We propose a simple interpretation of the rotation period data for solar-and late-type stars.
The open cluster and Mount Wilson star observations suggest that rotating stars lie primarily …

Magnetic activity similar to that of the Sun is observed on a variety of cool stars with external
convection envelopes. Stellar rotation coupled with convective motions generate strong …

Aims. We investigate the photometric modulation induced by magnetic activity cycles and
study the relationship between rotation period and activity cycle (s) in late-type (FGKM) stars …

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 …

The solar dynamo continues to pose a challenge to observers and theoreticians.
Observations of the solar surface reveal a magnetic field with a complex, hierarchical …

Until the last few decades, investigations of stellar interiors had been restricted to theoretical
studies only constrained by observations of their global properties and external …