Volume 526, February 2011
|Number of page(s)||11|
|Published online||20 December 2010|
Multicomponent He I 10 830 Å profiles in an active filament
Max-Planck-Institut für Sonnensystemforschung,
2 INAF – Osservatorio Astronomico di Capodimonte, Salita Moiariello 16, 80131 Napoli, Italy
3 School of Space Research, Kyung Hee University, Yongin, 446-701 Gyeonggi, Korea
Accepted: 27 September 2010
Aims. We present new spectropolarimetric observations of the chromospheric He i 10 830 Å multiplet observed in a filament during its phase of activity.
Methods. 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.
Results. 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-1. Up to five different atmospheric components are found in the same profile. We show that even these complex profiles can be reliably inverted.
Key words: Sun: chromosphere / magnetic fields / Sun: infrared
© ESO, 2010
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.