Spectropolarimetric Fluctuations in a Sunspot Chromosphere
Date Issued
2021
Author(s)
•
Baker, D.
•
Valori, G.
•
Jess, D. B.
•
Jafarzadeh, S.
•
•
To, A. S. H.
•
Brooks, D. H.
•
•
•
MacBride, C. D.
Abstract
The instrumental advances made in this new era of 4-meter class solar
telescopes with unmatched spectropolarimetric accuracy and sensitivity, will
enable the study of chromospheric magnetic fields and their dynamics with
unprecedented detail. In this regard, spectropolarimetric diagnostics can
provide invaluable insight into magneto-hydrodynamic (MHD) wave processes. MHD
waves and, in particular, Alfv\'enic fluctuations associated to particular wave
modes, were recently recognized as important mechanisms not only for the
heating of the outer layers of the Sun's atmosphere and the acceleration of the
solar wind, but also for the elemental abundance anomaly observed in the corona
of the Sun and other Sun-like stars (also known as first ionisation potential;
FIP) effect. Here, we take advantage of state-of-the-art and unique
spectropolarimetric IBIS observations to investigate the relation between
intensity and circular polarisation (CP) fluctuations in a sunspot
chromosphere. Our results show a clear link between the intensity and CP
fluctuations in a patch which corresponds to a narrow range of magnetic field
inclinations. This suggests the presence of Alfv\'enic perturbations in the
sunspot.
Volume
379
Issue
2190
Issn Identifier
1364-503X
Rights
open.access
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