Database of near-infrared Solar observations obtained with the TST-2 CrAO telescope

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Abstract

Systematic observations in the near-infrared on the TST-2 solar tower telescope of the Crimean Astrophysical Observatory began in 1999 and continue until now. During this time, unique observational material has been accumulated that allows us to analyze the evolution of coronal holes, filaments and active regions. Due to the fact that during this time the observational process has been repeatedly modernized with varying degrees of complexity, and changes have been made to the processing programs, we have several series of spectroheliograms of different types. The last stage of modernization, in particular, concerned the creation of new software, with the possibility of stream processing of observation results. This allowed us to systematize the work to unify the presentation of our data. In this paper, we present the updated database. The structure of the database, access to its elements, and examples of comparison of solar disk maps from our database with images of the Sun in other spectral lines and synthesized by different algorithms are discussed. The unified database is a convenient tool for uniform visualization of observational material obtained over more than two solar cycles. It can be useful for scientific research in the field of studying the nature and evolution of coronal holes and their connection with other structures on the Sun.

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About the authors

O. A. Andreeva

Crimean Astrophysical Observatory, Russian Academy of Sciences

Author for correspondence.
Email: olga@craocrimea.ru
Russian Federation, Nauchny

V. M. Malashchuk

Crimean Astrophysical Observatory, Russian Academy of Sciences

Email: mvm@craocrimea.ru
Russian Federation, Nauchny

A. A. Plotnikov

Crimean Astrophysical Observatory, Russian Academy of Sciences

Email: plotnikov.andrey.alex@yandex.ru
Russian Federation, Nauchny

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Supplementary files

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2. Fig. 1. Images of the Sun obtained in the He I 10830 Å line on the universal spectrophotometer of the BST-2/KrAO telescope in different periods. On the left – before unification, on the right – maps of the Sun's disk for the same dates, but processed according to the same methodology.

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3. Fig. 2. Images of the Sun obtained in the He I 10830 Å line on the universal spectrophotometer of the BST-2 telescope. On the left is the raw image, on the right is the processed image, taking into account darkening to the edge and eliminating backlash. The coronal holes in this line look like brighter formations compared to the surrounding surface, and the fibers and active regions look like very dark ones.

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4. Fig. 3. Unified database of observations of the Sun's disk in the line He I 10830 Å, presented on the KrAO page.

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5. Fig. 4. The directory structure of the updated database. April 2021

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6. Fig. 5. Maps of the Sun's disk obtained in the He I 10830 Å line on the same day − October 11, 2023 at 09:17, 10:03 and 11:05. On the left – images with darkening to the limb, on the right – processed taking into account darkening.

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7. Fig. 6. Images of the Sun obtained on 4.07.2003 in the spectral lines He I 10830 Å – on the left and Fe XII 195 Å – on the right, in the center are interactive maps of the CA according to the KGAS website (https://observethesun.com ).

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8. Fig. 7. Images of the Sun obtained on 6.08.2012 in the spectral lines He I 10830 Å H-alpha and Fe XII 193 Å – upper row from left to right. Bottom row: in the center there are interactive maps of the CA according to the KGAS data from the website (https://observethesun.com ). On the left and right are images of the Sun with CD, identified by the CHIMERA and SPoCA algorithms, respectively.

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9. Fig. 8. Images of the Sun obtained on 11.10.2023 in the spectral lines He I 10830 Å, H-alpha, Fe XII 193 Å – upper row from left to right. Bottom row: in the center are interactive maps of the CA according to the KGAS website (https://observethesun.com ). On the left and right are images of the Sun with CD, identified by the CHIMERA and SPoCA algorithms, respectively.

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