The question of what heats the solar corona remains one of the most important problems in
astrophysics. Finding a definitive solution involves a number of challenging steps, beginning …

We review our state of knowledge of coronal element abundance anomalies in the Sun and
stars. We concentrate on the first ionization potential (FIP) effect observed in the solar …

X-ray and ultraviolet (UV) observations of the outer solar atmosphere have been used for
many decades to measure the fundamental parameters of the solar plasma. This review …

The origin of the solar wind in solar coronal holes has long been unclear. We establish that
the solar wind starts flowing out of the corona at heights above the photosphere between 5 …

Coronal holes are the lowest density plasma components of the Sun's outer atmosphere,
and are associated with rapidly expanding magnetic fields and the acceleration of the high …

Plasma in the Sun's hot corona expands into the heliosphere as a supersonic and highly
magnetized solar wind. This paper provides an overview of our current understanding of …

The physical mechanisms behind accelerating solar and stellar winds are a long-standing
astrophysical mystery, although recent breakthroughs have come from models invoking the …

The temporal variations of solar rotation in the photosphere, chromosphere, and corona
have been widely investigated, whereas the rotation of the solar transition region is rarely …

Aims. We use new data from the High-resolution Coronal Imager (Hi-C) with its
unprecedented spatial resolution of the solar corona to investigate the structure of coronal …

ABSTRACT A comprehensive multiwavelength campaign has been carried out to probe
stellar activity and variability in the young Sun-like star ι-Horologii. We present the results …