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 …

In this review we give an overview about the current state-of-knowledge of the magnetic field
in sunspots from an observational point of view. We start by offering a brief description of …

A quantum walk is a time-homogeneous quantum-mechanical process on a graph defined
by analogy to classical random walk. The quantum walker is a particle that moves from a …

Ongoing studies in mathematical depth, and inferences fromhelioseismological'observations
of the internal solar rotation have shown up the limitations in our knowledge of the solar …

Context. The study of stellar activity is important because it can provide new constraints for
dynamo models when combined with surface rotation rates and the depth of the convection …

We present for the first time the evolution of the photospheric electric currents during an
eruptive X-class flare, accurately predicted by the standard three-dimensional (3D) flare …

The Sun's supergranulation refers to a physical pattern covering the surface of the quiet Sun
with a typical horizontal scale of approximately 30,000 km and a lifetime of around 1.8 d. Its …

The Sun supports a rich spectrum of internal waves that are continuously excited by
turbulent convection. The Global Oscillation Network Group (GONG) network and the …

ABSTRACT MHD simulations of sunspots have successfully reproduced many aspects of
sunspot fine structure as a consequence of magneto-convection in inclined magnetic field …

Hinode is Japan's third solar mission following Hinotori (1981–1982) and Yohkoh (1991–
2001): it was launched on 2006 September 22 and is in operation currently. Hinode carries …