Solar coronal magnetic field diagnostics through polarimetric forward modelling of the Hanle effect

Diagnostics of Coronal Magnetic Fields through the Hanle Effect in UV and IR Lines

1 The John Hopkins University Applied Physics Laboratory, Laurel, MD, USA, 2 Predictive Science Inc., San Diego, CA, USA, 3 High Altitude Observatory, National Center for Atmospheric Research, Boulder, CO, USA, 4 The Astrophysical Observatory of Turin, National Institute for Astrophysics, Turin, Italy, 5 Max-Planck-Institut für Sonnensystemforschung, Göttingen, Germany, 6 School of Space Resear...

Reconstruction of Solar Coronal Linear Force-Free Magnetic Field

reconstruction of solar coronal linear force-free magnetic field

Hanle diagnostics of solar magnetic fields : the Sr ii 4078 Å line

The Hanle depolarization and rotation effects in the Sr ii 4078 Å line have been explored with the instrumentation at IRSOL (Istituto Ricerche Solari Locarno) by recording the Stokes I , Q, and U line profiles with high spectral resolution and polarimetric accuracy in a large number of regions across the solar disk. From the extracted line parameters we have constructed “Hanle histograms” showi...

Infrared Dual-Line Hanle Diagnostic of the Coronal Vector Magnetic Field

Measuring the coronal vector magnetic field is still a major challenge in solar physics. This is due to the intrinsic weakness of the field (e.g., ∼ 4G at a height of 0.1R⊙ above an active region) and the large thermal broadening of coronal emission lines. We propose using concurrent linear polarization measurements of near-infrared forbidden and permitted lines together with Hanle effect model...