Aims: We study chromospheric emission to understand the temperature stratification in the solar chromosphere. Methods: We observed the intensity profile of the Ca II H line in a quiet Sun region close to the disk center at the German Vacuum Tower Telescope. We analyze over 105 line profiles from inter-network regions. For comparison with the

We study the excitation and damping of transverse oscillations in a multistranded model of a straight line-tied coronal loop. The transverse geometry of our equilibrium configuration is quite irregular and more realistic than the usual cylindrical loop model. By numerically solving the time-dependent ideal magnetohydrodynamic equations in two

Despite the great developments that have been achieved in the last decade in disentangling most relevant stellar population parameters, in particular with the inclusion of absorption linestrength indices, the age-metallicity degeneracy still lurks in these studies. Here I summarize our effort for developing the stellar population synthesis method

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Observations show a relation between the brightest young star cluster and the present overall star formation rate of a galaxy. A possible explanation would be the formation of complete cluster populations in rather short formation epochs lasting ≈ 10 Myr. This implies that the star formation history of a galaxy is a sequence of formation epochs, in

Motivated by recent progress in the study of early-type galaxies owing to technological advances, the launch of new space telescopes, and large ground-based surveys, we attempt a short review of our current understanding of the recent star formation activity in such intriguing galactic systems.