Context. Light bridges are bright, long, and narrow features that are typically connected to
the formation or decay processes of sunspots and pores. Aims. The interaction of magnetic …

A high resolution image showing fine structures is crucial for understanding the nature of
solar prominence. In this paper, high resolution imaging of solar prominence on the New …

The improved High-resolution Fast Imager (HiFI+) is a multiwavelength imaging filtergraph,
which was commissioned at the GREGOR solar telescope at Observatorio del Teide, Izaña …

Context. The chromospheric Hα spectral line is a strong line in the spectrum of the Sun and
other stars. In the stellar regime, this spectral line is already used as a powerful tracer of …

Context. High angular resolution images at a wide field of view are required for investigating
Solar physics and predicting space weather. Ground-based observations are often subject …

A huge amount of data has been acquired with the GREGOR Fabry-Pérot Interferometer
(GFPI), large-format facility cameras, and since 2016 with the High-resolution Fast Imager …

The strong chromospheric absorption lines Ca ii H & K are tightly connected to stellar
surface magnetic fields. Only for the Sun, spectral activity indices can be related to evolving …

In recent years, the new physics of the Sun has been revealed using advanced data with
high spatial and temporal resolutions. The Helioseismic and Magnetic Imager (HMI) on …

Aims. The expansion with height of the solar photospheric magnetic field and the plasma
flows is investigated for three isolated bright points (BPs). Methods. The BPs were observed …

With aperture synthesis (AS) technique, a number of small antennas can be assembled to
form a large telescope whose spatial resolution is determined by the distance of two farthest …