Abstract The Helioseismic and Magnetic Imager (HMI) began near-continuous full-disk solar
measurements on 1 May 2010 from the Solar Dynamics Observatory (SDO). An automated …

The structure and dynamics of the solar corona is dominated by the magnetic field. In most
areas in the corona magnetic forces are so dominant that all non-magnetic forces such as …

Abstract The Helioseismic and Magnetic Imager (HMI) instrument and investigation as a part
of the NASA Solar Dynamics Observatory (SDO) is designed to study convection-zone …

Solar prominences are one of the most common features of the solar atmosphere. They are
found in the corona but they are one hundred times cooler and denser than the coronal …

We report the evolution of the magnetic field and its energy in NOAA active region 11158
over five days based on a vector magnetogram series from the Helioseismic and Magnetic …

Nonlinear force-free field (NLFFF) models are thought to be viable tools for investigating the
structure, dynamics, and evolution of the coronae of solar active regions. In a series of …

In this review we give an overview about the current state-of-knowledge of the magnetic field
in sunspots from an observational point of view. We start by offering a brief description of …

The objective testing of algorithms for performing ambiguity resolution in vector magnetic
field data is continued, with an examination of the effects of noise in the data. Through the …

We compare line-of-sight magnetograms from the Helioseismic and Magnetic Imager (HMI)
onboard the Solar Dynamics Observatory (SDO) and the Michelson Doppler Imager (MDI) …

Solar flares and coronal mass ejections are associated with rapid changes in field
connectivity and are powered by the partial dissipation of electrical currents in the solar …