We present new spectropolarimetric observations of the chromospheric He I 10830 {\AA} multiplet observed in a filament during its phase of activity. The data were recorded with the new Tenerife Infrared Polarimeter (TIP-II) at the German Vacuum Tower Telescope (VTT) on 2005 May 18. We inverted the He Stokes profiles using multiple atmospheric components. The observed He Stokes profiles display a remarkably wide variety of shapes. Most of the profiles show very broad Stokes I absorptions and complex and spatially variable Stokes V signatures. The inversion of the profiles shows evidence of different atmospheric blue- and redshifted components of the He I lines within the resolution element (1 arcsec), with supersonic velocities of up to 100 km/s. Up to five different atmospheric components are found in the same profile. We show that even these complex profiles can be reliably inverted.
Cite
@article{arxiv.1101.5563,
title = {Multicomponent He I 10830 {\AA} profiles in an active filament},
author = {C. Sasso and A. Lagg and S. K. Solanki},
journal= {arXiv preprint arXiv:1101.5563},
year = {2011}
}
Comments
Accepted for publication in Astronomy and Astrophysics on September 27, 2010