Solar flares are often accompanied by filament/prominence eruptions (~ 104 K and~ 1010−
11 cm− 3), sometimes leading to coronal mass ejections that directly affect the Earth's …

Magnetic storms on stars manifest as remarkable, randomly occurring changes of the
luminosity over durations that are tiny in comparison to the normal evolution of stars. These …

We report the latest statistical analyses of superflares on solar-type (G-type main-sequence;
effective temperature is 5100–6000 K) stars using all of the Kepler primary mission data and …

Context. One clear manifestation of dynamo action on the Sun is the 22-yr magnetic cycle,
exhibiting a polarity reversal and a periodic conversion between poloidal and toroidal fields …

One of the most important early results from the Parker Solar Probe (PSP) is the ubiquitous
presence of magnetic switchbacks, whose origin is under debate. Using a three-dimensional …

Superflares may provide the dominant source of biologically relevant UV radiation to rocky
habitable-zone M-dwarf planets (M-Earths), altering planetary atmospheres and conditions …

Sun-as-a-star analyses in which observational data is spatially integrated are useful for
interpreting stellar data. For future applications to stellar observations, we performed Sun-as …

Context. A challenge with radial-velocity (RV) data is disentangling the origin of signals
either due to a planetary companion or to stellar activity. In fact, the existence of a planetary …

Stellar coronal mass ejections (CMEs) have recently received much attention for their
impacts on exoplanets and stellar evolution. Detecting prominence eruptions, the initial …

Redshifted components of chromospheric emission lines in the hard X-ray impulsive phase
of solar flares have recently been studied through their 30 s evolution with the high …