The evolution of active regions (AR) from their emergence through their long decay process
is of fundamental importance in solar physics. Since large-scale flux is generated by the …

This review article summarizes the advancement in the studies of Earth-affecting solar
transients in the last decade that encompasses most of solar cycle 24. It is a part of the effort …

Coronal mass ejections (CMEs) were discovered in the early 1970s when space-borne
coronagraphs revealed that eruptions of plasma are ejected from the Sun. Today, it is known …

Strong solar flares and coronal mass ejections, here defined not only as the bursts of
electromagnetic radiation but as the entire process in which magnetic energy is released …

The magnetic field of the Sun is the underlying cause of the many diverse phenomena
combined under the heading of solar activity. Here we describe the magnetic field as it …

Magnetic flux emergence from the solar convection zone into the overlying atmosphere is
the driver of a diverse range of phenomena associated with solar activity. In this article, we …

The coronal magnetic configuration of an active region typically evolves quietly for a few
days before becoming suddenly eruptive and launching a coronal mass ejection (CME). The …

The source of coronal magnetic energy and helicity lies below the surface of the Sun,
probably in the convective zone dynamo. Measurements of magnetic and velocity fields can …

There has been a revolution in understanding the nature of the Sun's atmosphere that has
been stimulated by high-resolution satellite observations together with the realisation that …

Since its introduction to astro-and solar physics, the concept of helicity has proven to be
useful in providing critical insights into physics of various processes from astrophysical …