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 …

This publication provides an overview of magnetic fields in the solar atmosphere with the
focus lying on the corona. The solar magnetic field couples the solar interior with the visible …

Abstract We have used Global Oscillation Network Group (GONG) magnetograms to
characterize the changes in the photospheric longitudinal magnetic field during 15 X-class …

Solar eruptions, observed as flares and coronal mass ejections (CMEs), are the most
energetic visible plasma phenomena in the solar system. CMEs are the central component …

A large fraction of major flares occur in active regions that exhibit a δ configuration. The
formation and disintegration of δ configurations is very important in understanding the …

In this paper, we present the results of the study of six X-class flares. We found significant
changes in the photospheric magnetic fields associated with all of the events. For the five …

It is well known that the long-term evolution of the photospheric magnetic field plays an
important role in building up free energy to power solar eruptions. Observations, despite …

The acceleration of coronal mass ejections (CMEs) is examined focusing on three specific
questions raised by observations:(1) what determines the height beyond which a CME …

We characterize the changes in the longitudinal photospheric magnetic field during 38 X-
class and 39 M-class flares within 65 of disk center using 1 minute GONG magnetograms. In …

In this paper we study the short-term evolution of magnetic fields associated with five flares
in δ-sunspots. We concentrate on the analysis of the magnetic gradient along the flaring …