TuMag: The Tunable Magnetograph for the Sunrise III Mission

作者：J. C. del Toro Iniesta, D. Orozco Suárez, A. Álvarez‐Herrero, E. Sanchis-Kilders, Isabel Pérez-Grande, B. Ruiz Cobo, L. R. Bellot Rubio, M. Balaguer Jiménez, A. C. López Jiménez, D. Álvarez García, J. L. Ramos Más, J. P. Cobos Carrascosa, P. Labrousse, Antonio J. Moreno Mantas, José Miguel Morales, Beatriz Aparicio del Moral, A. Gomez, E. Bailón Martínez, F. J. Bailén, H. Strecker, A. L. Siu-Tapia, P. Santamarina Guerrero, A. Moreno Vacas, J. Atiénzar García, A. J. Dorantes-Monteagudo, Ignacio Bustamante, Ángel Tobaruela, A. Fernández-Medina, A. Núñez Peral, María Cebollero, Daniel Garranzo-García, P. García Parejo, A. Gonzalo Melchor, A. Sánchez Rodríguez, Antonio Campos-Jara, H. Laguna, Manuel Silva-López, J. Blanco Rodríguez, J. L. Gasent Blesa, P. Martinez, A. Ferreres, Dean L. Palmer, Ignacio Torralbo, J. Piqueras, David González-Bárcena, A. J. Fernández, David Hernández Expósito, E. Páez Mañá, Eduardo Magdaleno Castelló, Manuel Rodríguez Valido, A. Lagg, A. Gandorfer, S. K. Solanki, Thomas Berkefeld, P. N. Bernasconi, A. Feller, Yukio Katsukawa, T. L. Riethmüller, H. N. Smitha, Masahito Kubo, V. Martı́nez Pillet, B. Grauf, Alexander Graham Bell, M. P. Carpenter · 发表于：Solar Physics · 年份：2025 · DOI：10.1007/s11207-025-02562-5 · 被引用次数：12 · 研究领域：Solar and Space Plasma Dynamics、Optical Polarization and Ellipsometry、Astro and Planetary Science

Abstract Sunrise iii is a balloon-borne solar observatory dedicated to the investigation of the processes governing the physics of the magnetic field and the plasma flows in the lower solar atmosphere. The gondola hosts a 1-m aperture telescope that feeds three post-focus instruments. One of these instruments, the Tunable Magnetograph (TuMag), is a tunable imaging spectropolarimeter in visible wavelengths. It is designed to probe the vector magnetic field, $\bf{B}$ , and the line-of-sight (LoS) velocity, $v_{\mathrm{LoS}}$ v LoS , of the photosphere and the lower chromosphere. It provides polarized images with a $63^{\prime \prime }\times \, 63^{\prime \prime }$ 63 ″ × 63 ″ field of view (FoV) of the Sun in four polarization states. These images can later be processed on ground to retrieve maps of the aforementioned solar physical quantities. The quasi-simultaneous observation of two spectral lines sensitive to $\bf{B}$ and $v_{\mathrm{LoS}}$ v LoS in the photosphere and lower chromosphere provides excellent diagnostic measurements of the magnetic and dynamic coupling in these layers. When combined with the other two instruments on board, observing in the infrared and ultraviolet regions of the spectrum, TuMag’s diagnostic potential is expected to be greatly enhanced. Building upon heritage of instruments like IMaX and SO/PHI, the key technologies employed for TuMag are a liquid-crystal-variable-retarder-based polarimete...