Author: Stephanie YardleyTo gain a better understanding of the formation and evolution of the pre-eruptive structure of CMEs requires the direct measurement of the coronal magnetic field, which is currently very difficult. An alternative approach, such as ... more
Author: Roberto CasiniWe realized a laboratory experiment to study the scattering polarization of the NaI D-doublet at 589.0 and 589.6 nm in the presence of a magnetic field. This work was stimulated by solar observations of that doublet, which have pr ... more
Author: Michal SobotkaSeveral mechanisms may heat the solar chromosphere: acoustic waves, magnetoacoustic waves (slow, fast, and Alfven waves), and small-scale magnetic reconnections. Based on observations in the Ca II 854.2 nm line, the contribution o ... more
Author: Kiwan ParkIn our conventional understanding, large-scale magnetic fields are thought to originate from an inverse cascade in the presence of magnetic helicity, differential rotation or a magneto-rotational instability. However, as recent si ... more
Author: Simon CandelaresiMagnetic helicity is a conserved quantity under an ideal evolution.
Here we present methods for simulating such topology conserving systems.
We make use of Lagrangian grids and mimetic differential operators.
It is shown that t ... more
Author: Carlo AlbertAssuming a simple data-generating model of the type "pure harmonics plus noise" and applying Bayesian inference techniques has two advantages over Fourier analysis: (i) lines that are separated by less than the Fourier resolution ... more
Author: Yu GaoBy using the photospheric vector magnetogram and subsurface vector velocity field, we studied the
systematic behavior of current helicity and relevant quantities of subsurface flow. Mainly it contains
1) The spatial ... more
Author: Sanjay gosainSynoptic observations of the Sun are very important to understand the long term behavior of
the solar activity cycle. Our current understanding solar magnetic cycle is rather in its infancy,
as can be inferred from our very poor ... more
Author: Johannes Löhner-BöttcherThe Laser Absolute Reference Spectrograph (LARS) is a novel scientific instrument for solar observations with the Vacuum Tower Telescope (VTT) on Tenerife. It works as a combination of the high-resolution Echelle Spectrograph of t ... more