Evidence of magnetic field wrapping around penumbral filaments
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TLDR
In this article, high-spatial resolution spectropolarimetric observations from the Solar Optical Telescope on-board the Hinode spacecraft were employed to investigate the fine structure of the penumbral magnetic fields.Abstract:
We employ high-spatial resolution spectropolarimetric observations from the Solar Optical Telescope on-board the Hinode spacecraft to investigate the fine structure of the penumbral magnetic fields. The Stokes vector of two neutral iron lines at 630 nm is inverted at every spatial pixel to retrieve the depth-dependence of the magnetic field vector, line-of-sight velocity and thermodynamic parameters. We show that the azimuthal angle of the magnetic field vector has opposite sign on both sides above the penumbral filaments. This is consistent with the wrapping of an inclined field around the horizontal filaments. The wrapping effect is stronger for filaments with larger horizontal extensions. In addition, we find that the external magnetic field can penetrate into the intraspines, leading to non-radial magnetic fields inside them. These findings shed some light on the controversial small-scale structure of the sunspot penumbra.read more
Citations
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Journal ArticleDOI
CRISP Spectropolarimetric Imaging of Penumbral Fine Structure
Göran B. Scharmer,Gautam Narayan,Gautam Narayan,T. Hillberg,T. Hillberg,J. de la Cruz Rodríguez,J. de la Cruz Rodríguez,Mats G. Löfdahl,Dan Kiselman,P. Sutterlin,M. van Noort,Andreas Lagg +11 more
TL;DR: In this paper, the penumbral fine structure in a small part of a pore, observed with the CRISP imaging spectropolarimeter at the Swedish 1-m Solar Telescope (SST), close to its diffraction limit of 0.16''.
Journal ArticleDOI
Radiative magnetohydrodynamic simulation of sunspot structure
TL;DR: In this article, a 3D MHD simulation of a sunspot with a photospheric size of about 20 Mm was performed with the MURaM code, which includes a realistic equation of state with partial ionization and radiative transfer along many ray directions.
Journal ArticleDOI
Magnetic Structure of Sunspots
J. M. Borrero,Kiyoshi Ichimoto +1 more
TL;DR: A review of the current state-of-the-art of the magnetic field in sunspots from an observational point of view is given in this article, with a brief description of tools that are most commonly employed to infer the magnetic fields in the solar atmosphere.
Journal ArticleDOI
Penumbral Fine Structure and Driving Mechanisms of Large-scale Flows in Simulated Sunspots
TL;DR: In this article, the authors analyzed the penumbral structure in a recent radiative magnetohydrodynamic simulation of the sunspot penumbra and found that the penumberal structure was consistent with the observationally inferred interlocking comb structure.
Journal ArticleDOI
Achievements of Hinode in the first eleven years
Khalid Al-Janabi,Patrick Antolin,Deborah Baker,Luis R. Bellot Rubio,Louisa Bradley,David H. Brooks,Rebecca Centeno,J. Leonard Culhane,Giulio Del Zanna,George A. Doschek,Lyndsay Fletcher,Hirohisa Hara,Louise K. Harra,Andrew Hillier,Andrew Hillier,Shinsuke Imada,James A. Klimchuk,John T. Mariska,Tiago M. D. Pereira,Katharine K. Reeves,Taro Sakao,Taro Sakao,Takashi Sakurai,Toshifumi Shimizu,Toshifumi Shimizu,Masumi Shimojo,Daikou Shiota,Daikou Shiota,Sami K. Solanki,Alphonse C. Sterling,Yingna Su,Yoshinori Suematsu,Theodore D. Tarbell,Sanjiv K. Tiwari,Shin Toriumi,Ignacio Ugarte-Urra,Harry P. Warren,Tetsuya Watanabe,Peter R. Young +38 more
TL;DR: In this article, an open access article distributed under the terms of the Creative Commons CC BY license, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
References
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Journal ArticleDOI
The Hinode(Solar-B)Mission: An Overview
Takeo Kosugi,K. Matsuzaki,Taro Sakao,Toshifumi Shimizu,Y. Sone,Sumitaka Tachikawa,Tatsuaki Hashimoto,Kenji Minesugi,Akira Ohnishi,T. Yamada,Saku Tsuneta,Hirohisa Hara,Kiyoshi Ichimoto,Yoshinori Suematsu,Masumi Shimojo,Takashi Watanabe,Shigenobu Shimada,John M. Davis,L. D. Hill,J. K. Owens,A. M. Title,J. L. Culhane,Louise K. Harra,George A. Doschek,Leon Golub +24 more
TL;DR: The Hinode satellite as discussed by the authors is the successor to the Yohkoh mission, which aims to understand how magnetic energy gets transferred from the photosphere to the upper atmosphere and results in explosive energy releases.
Journal ArticleDOI
Inversion of Stokes profiles
TL;DR: In this paper, an inversion code of Stokes line profiles is presented, which allows the recovery of the stratification of the temperature, the magnetic field vector, and the line of sight velocity through the atmosphere.
Journal ArticleDOI
CRISP Spectropolarimetric Imaging of Penumbral Fine Structure
Göran B. Scharmer,Gautam Narayan,Gautam Narayan,T. Hillberg,T. Hillberg,J. de la Cruz Rodríguez,J. de la Cruz Rodríguez,Mats G. Löfdahl,Dan Kiselman,P. Sutterlin,M. van Noort,Andreas Lagg +11 more
TL;DR: In this paper, the penumbral fine structure in a small part of a pore, observed with the CRISP imaging spectropolarimeter at the Swedish 1-m Solar Telescope (SST), close to its diffraction limit of 0.16''.
Journal ArticleDOI
Radiative magnetohydrodynamic simulation of sunspot structure
TL;DR: In this article, a 3D MHD simulation of a sunspot with a photospheric size of about 20 Mm was performed with the MURaM code, which includes a realistic equation of state with partial ionization and radiative transfer along many ray directions.
Journal ArticleDOI
Magnetoconvection in a sunspot umbra
Manfred Schüssler,A. Vögler +1 more
TL;DR: In this article, a simulation of radiative magnetoconvection in a strong background magnetic field corresponding to the conditions in sunspot umbrae is presented, where the convective energy transport is dominated by narrow upflow plumes with adjacent downflows, which become almost field-free near the surface layers.