Contributed Talk - Splinter Solar

Wednesday, 23 September 2020, 16:56   (virtual room L)

Wavelength Dependence of Image Quality Metrics and Seeing Parameters

R.Kamlah, M. Verma, A. Diercke, C. Denker
Leibniz-Institut für Astrophysik Potsdam (AIP) , Universität Potsdam

Ground-based solar observations are severely degraded by Earth's turbulent atmosphere. As a consequence, the observed image quality is closely related to the prevailing seeing conditions. We compare different image quality metrics and parameters describing the seeing characteristics. Time-series of solar granulation were obtained at solar disk center with the Vacuum Tower Telescope (VTT), Observatorio del Teide (OT), Izaña, Tenerife, Spain. The time-series were recorded with two synchronized, large-format, high-cadence sCMOS imagers, where one camera always observed the G-band, whereas the other camera observed at various wavelength settings from Ca II H at 396.8 nm to the near-infrared at 861 nm. A correlation analysis yields the wavelength dependence of the image quality metrics and seeing parameters, and Uniform Manifold Approximation and Projection (UMAP) is employed to characterize the seeing on a particular observing day. In addition, the image quality metrics and seeing parameters are used to determine the field-dependence of the correction provide by the adaptive optics system.