European Solar Observatory Sunspot Databases and Solar Physics

Welcome to the homepage of the Heliophysical Observatory, Debrecen

The observatory is part of the Institute of Earth Physics and Space Science. The observatory conducts scientific research in the fields of solar activity, heliospheric processes and solar-terrestrial connections. The main products of the observatory are the most detailed existing sunspot databases. These are produced from ground-based observations and from space-borne observations taken by the SOHO/MDI and SDO/HMI instruments.


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Solar News

Observatory News

2018-01-31 | Applications for this PhD thesis topic are accepted:
Study of solar activity and solar irradiance
Scholarship can be applied for at DE Doctoral School of Physics at University of Debrecen
Special scholarship - Stipendium Hungaricum - is available for students from developing countries. Deadline : 16-Feb-2018
Questions concerning this thesis topic proposal can be sent to Dr. Tünde Baranyi (baranyi.tunde[at]

2017-07-01 | Debrecen Photoheliographic Data (DPD) Sunspot Catalog – Update:
The final version of Debrecen Photoheliographic Data for the years 2014 and 2002 has been published recently (see the summary table of the Debrecen solar databases). If you have any requests, comments, questions, or suggestions on the Debrecen solar databases, please mail to baranyi.tunde[at]

2017-04-13 | Recently a few articles have been published on the databases and the history of the observatory:
BARANYI, T., GYŐRI, L., LUDMÁNY, A.: 2016, On-line Tools for Solar Data Compiled in the Debrecen Observatory and their Extensions with the Greenwich Sunspot Data, Solar Phys., 291, Issue 9-10, pp. 3081-3102, doi:10.1007/s11207-016-0930-1, arXiv e-print

BARANYI, T., GYŐRI, L., LUDMÁNY, A.: 2016, Heritage of Konkoly's Solar Observations: the Debrecen Photoheliograph Programme and the Debrecen Sunspot Databases, In: Koci, E. (ed.) Conference dedicated to the 100th anniversary of the death of Dr. Nicolaus Thege-Konkoly, and 145th anniversary of the founding of the Hurbanovo Observatory, Hurbanovo, Szlovákia, 2016.05.18-2016.05.20. Slovenska Ustredna Hvezdaren, pp. 29-36., arXiv e-print

GYŐRI, L., LUDMÁNY, A., BARANYI, T., : 2017, Comparative analysis of Debrecen sunspot catalogues, Monthly Notices of the Royal Astronomical Society, 465, (2), 1259-1273, DOI: 10.1093/mnras/stw2667, arXiv Final - Version of Record

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Heliophysical Observatory
Address: 4026 Debrecen, Poroszlay út 6.
ATOMKI Building VI, Rooms 210-211
Postal: 4010 Debrecen Pf. 30.

Institute of Earth Physics and Space Science
Address: 9400 Sopron, Csatkai E. u. 6-8.
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Phone: +36-99-508-350

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