Göttingen 2025 – scientific programme
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EP: Fachverband Extraterrestrische Physik
EP 4: Sun and Heliosphere II
EP 4.6: Talk
Tuesday, April 1, 2025, 15:15–15:30, ZHG101
Diffraction limited solar spectro-polarimetry and first steps towards solar many-line inversion — •J. Hölken1, H.-P. Doerr1,2, A. Feller1, M. van Noort1, T. L. Riethmüller1, S. K. Solanki1,3, W. Cao4,5, J. Kang6, J. Chae6, and E.-K. Lim7 — 1Max-Planck-Institut für Sonnensystemforschung, Germany — 2Thüringer Landessternwarte, Germany — 3School of Space Research, Kyung Hee University, Republic of Korea — 4Big Bear Solar Observatory, USA — 5New Jersey Institute of Technology, USA — 6Astronomy Program, Seoul National University, Republic of Korea — 7Korea Astronomy and Space Science Institute, Republic of Korea
In this contribution we present the first diffraction limited spectro-polarimetric data from a 1.6 meter telescope with unprecedented spatial and outstanding spectral resolution.
To explore the performance of image restoration of high resolution solar spectra we extended the FISS instrument installed at the Goode Solar Telescope (GST) by spectro-polarimetric capabilities, a fast context imager, and a large format spectrograph camera. The resulting instrument can accommodate a spectral range in excess of 30 Å. This allows for the simultaneous full Stokes observation of more than 160 solar absorption lines.
In contrast to stellar physics, for solar spectra the simultaneous observation and interpretation of only a few lines is still typical. Here, we combine for the first time the information of more than 80 lines. In comparison to results from a line-doublet inversion, we find more fine-structure and better constrained values.
Keywords: Instrumentation: polarimeters; Instrumentation: spectrographs; Sun: photosphere; Methods: observational; magnetohydrodynamics (MHD)