▪ Abstract In the past decade a number of observational and theoretical studies have
appeared that address the problem of how both the physical conditions in subsurface layers …

A Relationship between Mean Rotation Period in Lower Main-Sequence Stars and Its ADS
Classic is now deprecated. It will be completely retired in October 2019. This page will …

Observations of Sun-like stars over the past half-century have improved our understanding
of how magnetic dynamos, like that responsible for the 11 yr solar cycle, change with …

The most commonly used index of stellar magnetic activity is the instrumental flux scale of
singly ionized calcium H & K line core emission, S, developed by the Mount Wilson …

Abstract The Kodaikanal Observatory has provided long-term synoptic observations of
chromospheric activities in the Ca ii K line (393.34 nm) since 1907. This article investigates …

We analyse the time variability of the total solar irradiance (TSI) as measured by
VIRGO/SoHO in order to model the variability of the Sun as a star. Apart from the phases …

Context. Understanding stellar activity in solar-type stars is crucial for the physics of stellar
atmospheres as well as for ongoing exoplanet programmes. Aims. We aim to test how well …

Using differential Strömgren b, y photometry, we monitored the brightness variations of 41
program stars and their 73 comparison stars from 1984 through 1995. The predominantly …

Solar-cycle-related variation of the solar chromospheric rotation is studied by analyzing the
chromospheric rotation rate of 938 synoptic maps generated from the Ca ii K line at the …

Chromospheric emission lines are the dominant energy input to the Earth's upper
atmosphere, where they create its embedded ionosphere. Knowledge of the Sun's …