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The 3D structure of the penumbra at high resolution from the bottom of the photosphere to the middle chromosphere

Published online by Cambridge University Press:  24 September 2020

Mariarita Murabito
Affiliation:
INAF–Osservatorio Astronomico di Roma, Via Frascati 33, I-00078, Monte Porzio Catone, Italy email: mariarita.murabito@inaf.it
Ilaria Ermolli
Affiliation:
INAF–Osservatorio Astronomico di Roma, Via Frascati 33, I-00078, Monte Porzio Catone, Italy email: mariarita.murabito@inaf.it
Fabrizio Giorgi
Affiliation:
INAF–Osservatorio Astronomico di Roma, Via Frascati 33, I-00078, Monte Porzio Catone, Italy email: mariarita.murabito@inaf.it
Marco Stangalini
Affiliation:
INAF–Osservatorio Astronomico di Roma, Via Frascati 33, I-00078, Monte Porzio Catone, Italy email: mariarita.murabito@inaf.it
Salvo L. Guglielmino
Affiliation:
Dipartimento di Fisica e Astonomia–Sezione Astrofisica Università degli studi di Catania, Via S. Sofia 78, I-95123 Catania, Italy
Shahin Jafarzadeh
Affiliation:
Rosseland Centre for Solar Physics, University of Oslo, P.O. BOX 1029 Blindern, NO-0315 Oslo, Norway Institute of Theoretical Astrophysics, University of Oslo, P.O. BOX 1029 Blindern, NO-0315 Oslo, Norway
Hector Socas-Navarro
Affiliation:
Instituto de Astrofisica de Canarias, C/Via Lactea s/n, E-38205 La Laguna, Tenerife, Spain Departimento de Astrofisica, Universidad de La Laguna, E-38205 La Laguna, Tenerife, Spain
Paolo Romano
Affiliation:
INAF–Osservatorio Astrofisico di Catania, Via S. Sofia 78,I-95123, Catania, Italy
Francesca Zuccarello
Affiliation:
Dipartimento di Fisica e Astonomia–Sezione Astrofisica Università degli studi di Catania, Via S. Sofia 78, I-95123 Catania, Italy

Abstract

Sunspots are the most prominent feature of the solar magnetism in the photosphere. Although they have been widely investigated in the past, their structure remains poorly understood. Indeed, due to limitations in observations and the complexity of the magnetic field estimation at chromospheric heights, the magnetic field structure of sunspot above the photosphere is still uncertain. Improving the present knowledge of sunspot is important in solar and stellar physics, since spot generation is seen not only on the Sun, but also on other solar-type stars. In this regard, we studied a large, isolated sunspot with spectro-polarimeteric measurements that were acquired at the Fe I 6173 nm and Ca II 8542 nm lines by the spectropolarimeter IBIS/DST under excellent seeing conditions lasting more than three hours. Using the Non-LTE inversion code NICOLE, we inverted both line measurements simultaneously, to retrieve the three-dimensional magnetic and thermal structure of the penumbral region from the bottom of the photosphere to the middle chromosphere. Our analysis of data acquired at spectral ranges unexplored in previous studies shows clear spine and intra-spine structure of the penumbral magnetic field at chromopheric heights. Our investigation of the magnetic field gradient in the penumbra along the vertical and azimuthal directions confirms results reported in the literature from analysis of data taken at the spectral region of the He I 1083 nm triplet.

Type
Contributed Papers
Copyright
© International Astronomical Union 2020

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References

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The 3D structure of the penumbra at high resolution from the bottom of the photosphere to the middle chromosphere
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