Observing the integrated and spatially resolved Sun with ultra-high spectral resolution

S. Schäfer; K. Royen; A. Huster Zapke; M. Ellwarth; A. Reiners

doi:10.1117/12.2560156

13 December 2020 Observing the integrated and spatially resolved Sun with ultra-high spectral resolution

S. Schäfer, K. Royen, A. Huster Zapke, M. Ellwarth, A. Reiners

Proceedings Volume 11447, Ground-based and Airborne Instrumentation for Astronomy VIII; 11447A9 (2020) https://doi.org/10.1117/12.2560156
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Conference Poster

Abstract

The Institute for Astrophysics Gottingen operates a solar observatory that combines a 50 cm siderostat with (1) a vacuum vertical telescope, (2) a very high resolution Fourier Transform Spectrograph (R < 900, 000 at 600 nm), and (3) a Laser Frequency Comb for extremely precise and accurate frequency calibration (< 10 cm/s). We introduce our setup that feeds the spectrograph with either a 32.5” field of view of the solar surface, or with disk-integrated sunlight for Sun-as-a-star observations and explain the necessary computational steps to guide specific positions on the solar surface into the fiber. Our instrument suite can deliver spectroscopic measurements with extremely accurate frequency calibration, which is valid across very large frequency regions (approx. 400-800 nm in wavelength). This allows precision spectroscopy of individual lines in order to study the variability of spectral lines in Sun-as-a-star observations as well as determining the convective blueshift across the solar surface from many spectral lines.

Citation Download Citation

S. Schäfer, K. Royen, A. Huster Zapke, M. Ellwarth, and A. Reiners "Observing the integrated and spatially resolved Sun with ultra-high spectral resolution", Proc. SPIE 11447, Ground-based and Airborne Instrumentation for Astronomy VIII, 11447A9 (13 December 2020); https://doi.org/10.1117/12.2560156

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