X-ray emission from stars in the cool half of the Hertzsprung-Russell diagram is generally
attributed to the presence of a magnetic corona that contains plasma at temperatures …

Shortly after the seminal paper “Self-Organized Criticality: An explanation of 1/f noise” by
Bak et al.(1987), the idea has been applied to solar physics, in “Avalanches and the …

Aims. We study the evolution of the rotation and the high energy X-ray, extreme ultraviolet
(EUV), and Ly-α emission for F, G, K, and M dwarfs, with masses between 0.1 and 1.2 M⊙ …

ABSTRACT A homogeneous search for stellar flares has been performed using every
available Kepler light curve. An iterative light curve de-trending approach was used to filter …

We present the largest sample of flares ever compiled for a single M dwarf, the active M4
star GJ 1243. Over 6100 individual flare events, with energies ranging from 10 29 to 10 33 …

A commonly used measure to summarize the nature of a photon spectrum is the so-called
hardness ratio, which compares the numbers of counts observed in different passbands. The …

We present results from a set of numerical simulations aimed at exploring the mechanism of
coronal mass ejection (CME) suppression in active stars by an overlying large-scale …

Non-degenerate stars of essentially all spectral classes are soft X-ray sources. Their X-ray
spectra have been important in constraining physical processes that heat plasma in stellar …

The first flare on the Sun was observed exactly 150 years ago. During most of the long
history, only secondary effects have been noticed, so flares remained a riddle. Now the …

The Sun's magnetic activity has steadily declined during its main-sequence life. While the
solar photospheric luminosity was about 30% lower 4.6 Gyr ago when the Sun arrived on …