We trace the evolution of research on extreme solar and solar-terrestrial events from the
1859 Carrington event to the rapid development of the last twenty years. Our focus is on the …

The Carrington event in 1859, a solar flare with an associated geomagnetic storm, has
served as a prototype of possible superflare occurrence on the Sun. Recent geophysical …

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 …

All-sky photometric time-series missions have allowed for the monitoring of thousands of
young (t age< 800 Myr) stars in order to understand the evolution of stellar activity. Here, we …

Aims. A stellar flare is a strong energy burst event. Understanding stellar flares is important
for determining the properties of stellar magnetic activities. We aim to perform detailed …

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 …

The high-quality light curves from the Transiting Exoplanet Survey Satellite (TESS) represent
a unique laboratory for the study of stellar rotation, which is a fundamental observable …

Context. Magnetic fields are a key component in the main sequence evolution of low mass
stars. Flares, energetic eruptions on the surfaces of stars, are an unmistakable manifestation …

Stellar flares are characterized by sudden enhancement of electromagnetic radiation in
stellar atmospheres. So far, much of our understanding of stellar flares has come from …

We present a photometric characterization of 208 ultra-cool dwarfs (UCDs) with spectral
types between M4 and L4, from 20-s and 2-min cadence TESS light curves. We determine …