Kanzelhöhe Observatory: instruments, data processing and data products

Abstract

Kanzelhöhe Observatory for Solar and Environmental Research (KSO) of the University of Graz (Austria) is in continuous operation since its foundation in 1943. Since the beginning its main task was the regular observation of the Sun in full disc. In this long time span covering almost seven solar cycles, a substantial amount of data was collected, which is made available online. In this paper we describe the separate processing steps from data acquisition to high level products for the different observing wavelengths. First of all we work out in detail the quality classification, which is important for further processing of the raw images. We show how we construct centre-to-limb variation (CLV) profiles and how we remove large scale intensity variations produced by the telescope optics in order to get images with uniform intensity and contrast. Another important point is an overview of the different data products from raw images to high contrast images with heliographic grids overlaid. As the data products are accessible via different sources we also present how to get information about the availability and how to obtain these data. Finally, in an appendix, we describe in detail the information in the FITS headers, the file naming and the data hierarchy.

39 pages, 21 figures, 3 tables

References in corpus (6)

• The Confined X-class Flares of Solar Active Region 2192
• Analysis of full disc Ca II K spectroheliograms III. Plage area composite series covering 1892-2019
• Flux cancellation and the evolution of the eruptive filament of 2011 June 7
• Real-time flare detection in ground-based H$\alpha$ imaging at Kanzelhöhe Observatory
• Formation and eruption of a flux rope from the sigmoid active region NOAA 11719 and associated M6.5 flare: A multi-wavelength study
• Solar differential rotation in the period 1964 - 2016 determined by the Kanzelhöhe data set

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• Variation in solar differential rotation and activity in the period 1964-2016 determined by the Kanzelhöhe data set
• Analysis of full-disc H alpha observations: Carrington maps and filament properties in 1909-2022
• Instrument-To-Instrument translation: Instrumental advances drive restoration of solar observation series via deep learning
• Investigating the effect of solar ambient and data characteristics on Ca II K observations and line profile measurements
• Sun CubE OnE: A Multi-wavelength Synoptic Solar Micro Satellite
• An analysis of the solar differential rotation in solar cycle No. 19 (1954-1964) determined using Kanzelhoehe sunspot group positions