Spectropolarimetric fluctuations in a sunspot chromosphere.

Autor:	Stangalini M; ASI, Italian Space Agency, Via del Politecnico snc, 00133 Rome, Italy.; INAF-OAR National Institute for Astrophysics, 00078 Monte Porzio Catone (RM), Italy., Baker D; University College London, Mullard Space Science Laboratory, Holmbury St. Mary, Dorking, Surrey RH5 6NT, UK., Valori G; University College London, Mullard Space Science Laboratory, Holmbury St. Mary, Dorking, Surrey RH5 6NT, UK., Jess DB; Astrophysics Research Centre, School of Mathematics and Physics, Queen's University Belfast, Belfast BT7 1NN, UK.; Department of Physics and Astronomy, California State University Northridge, Northridge, CA 91330, USA., Jafarzadeh S; Rosseland Centre for Solar Physics, University of Oslo, PO Box 1029 Blindern, 0315 Oslo, Norway.; Institute of Theoretical Astrophysics, University of Oslo, PO Box 1029 Blindern, 0315 Oslo, Norway., Murabito M; INAF-OAR National Institute for Astrophysics, 00078 Monte Porzio Catone (RM), Italy., To ASH; University College London, Mullard Space Science Laboratory, Holmbury St. Mary, Dorking, Surrey RH5 6NT, UK., Brooks DH; College of Science, George Mason University, 4400 University Drive, Fairfax, VA 22030, USA., Ermolli I; INAF-OAR National Institute for Astrophysics, 00078 Monte Porzio Catone (RM), Italy., Giorgi F; INAF-OAR National Institute for Astrophysics, 00078 Monte Porzio Catone (RM), Italy., MacBride CD; Astrophysics Research Centre, School of Mathematics and Physics, Queen's University Belfast, Belfast BT7 1NN, UK.
Jazyk:	angličtina
Zdroj:	Philosophical transactions. Series A, Mathematical, physical, and engineering sciences [Philos Trans A Math Phys Eng Sci] 2021 Feb 08; Vol. 379 (2190), pp. 20200216. Date of Electronic Publication: 2020 Dec 21.
DOI:	10.1098/rsta.2020.0216
Abstrakt:	The instrumental advances made in this new era of 4 m 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, Alfvénic fluctuations associated with 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 ionization potential) effect. Here, we take advantage of state-of-the-art and unique spectropolarimetric Interferometric BIdimensional Spectrometer observations to investigate the relation between intensity and circular polarization (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 Alfvénic perturbations in the sunspot. This article is part of the Theo Murphy meeting issue 'High-resolution wave dynamics in the lower solar atmosphere'.
Databáze:	MEDLINE
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