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Observations of the Sun

from the Astronomical Center of the University of Shumen

Samuil Petrov [1],

Dragomir Marchev [1], Sunay Ibryamov [1],

Rositsa Miteva [2]

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[1] Shumen University

[2] IANAO-BAS

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Astronomical Center - Shumen University

https://astro.shu.bg

The Astronomical Center (AC) "Prof. Dr.F.M.N. Vladimir Shkodrov" was established as a structure of the Shumen University (SU) "Bishop Konstantin Preslavski" in 1997.

It is located on the 3rd building of the Shumen University.

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Astronomical Observatory - Shumen

The building of the Astronomical Observatory is located in the Shumen Plateau Nature Park and has coordinates: latitude φ=43° 15' 27", longitude λ=26° 55' 23" and altitude 493 meters.

Credit: P. Markishki

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Solar instrumentation

  • Telescope: refractor, Coronado ST 40/400 PST Personal Solar Telescope OTA, D = 40 mm, focal ratio: f/10
  • Mount/guiding: azimuthal, ‘HelioFind’ automatic Sun-guiding system
  • Camera: NexImage 5 CCD camera
  • Filter: integrated H-alpha

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Test images: 2025-09-23

23-09-2025

Credit: P. Makishki

  • Weak interference pattern, needs improvement
  • Sunspot groups clearly visible

Miteva et al. SES-2025 proceedings (in press)

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Acknowledgement

(1) Pencho Markishki

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(2) Bulgarian-Austrian bilateral project ‘Joint Observations and Investigations of Solar Chromospheric and Coronal Activity’, supported by

Bulgarian National Science Foundation project No. KP-06-Austria/5 (14-08-2023) and

Austria’s Agency for Education and Internationalisation (OeAD) project No. BG 04/2023

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(3) Project RACIO supported by the Ministry of Education and Science of Bulgaria (Bulgarian National Roadmap for Research Infrastructure)

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(4) Project LOFAR-BG supported by the Ministry of Education and Science of Bulgaria (Bulgarian National Roadmap for Research Infrastructure)

References

First test observations are included in Miteva et al. SES-2025 Proceedings (in press)