Introduction

Data policy and publications

Appended magnetic observations

Acknowledgements

FTP access

Data policy and publications:

Datasets are available without restrictions, but the authors should refer to the following papers if the Debrecen data are used in any publications:

Baranyi, T., Győri, L., Ludmány, A., On-line Tools for Solar Data Compiled at the Debrecen Observatory and their Extensions with the Greenwich Sunspot Data, Solar Physics, 291, Issue 9-10, pp. 3081-3102, 2016, DOI: 10.1007/s11207-016-0930-1
and
Győri, L., Ludmány, A., Baranyi, T., Comparative analysis of Debrecen sunspot catalogues, Monthly Notices of the Royal Astronomical Society, 465 (2), 1259-1273, 2017, DOI: 10.1093/mnras/stw2667 arXiv Final - Version of Record,
If the Debrecen tilt angle data are used in any publications, please also refer to this paper:
Baranyi, T.: 2015, Comparison of Debrecen and Mount Wilson/Kodaikanal sunspot group tilt angles and the Joy's law, MNRAS, 447, (4): 1857-1865, doi:10.1093/mnras/stu2572 , PDF preprint

If magnetograms or full-disk scans are used, the original source of files should be indicated.
We would be especially grateful if the authors sent a short message with the bibliographic details of their paper when DPD is referred to.

On the method of  compilation of DPD and its comparative studies see the following papers:

GYÕRI, L.: 1998, Automation of area measurement of sunspots, Solar Phys. ,180, 109, pdf

BARANYI, T., GYÕRI, L., LUDMÁNY, A., Coffey, H.E.: 2001, Comparison of sunspot area data bases, Monthly Notices of R.A.S., 323(1), 223-230, PDF

GYÕRI, L.: 2003, Compiling sunspot catalogue: the principles, Proc. SIRW Meeting, (Oct. 23-24, 2003, Royal Observatory of Belgium), CD-ROM, pdf

GYÕRI, L., BARANYI, T., MURAKÖZY, J., LUDMÁNY, A.: 2005, Recent advances in the Debrecen sunspot catalogues, Mem. S.A.It., 76, 981, pdf

GYÕRI, L. : 2005, Automated determination of the alignment of solar images, Hvar Obs. Bull., 29, 299-308, pdf

GYÕRI, L.: 2010, Precise Determination of the Orientation of the Solar Image, Solar Physics,  267,  445-461, DOI: 10.1007/s11207-010-9663-8

GYÕRI, L.: 2012, Study of differences between sunspot and white light facular area data determined from SDO/HMI and SOHO/MDI observations, Solar Physics,  280,  365-378, DOI: 10.1007/s11207-012-9987-7

GYÕRI, L., BARANYI, T., LUDMÁNY, A.: Photospheric data programs at the Debrecen Observatory, Proc. of the Intern. Astron. Union, 6, Symp. S273, August 2010, 403-407, 2011, DOI: 10.1017/S174392131101564X

BARANYI, T., Király, S., Coffey, H. E.: 2013, Indirect comparison of Debrecen and Greenwich daily sums of sunspot areas, MNRAS, 434 (2), 1713-1720, DOI: 10.1093/mnras/stt1134, PDF preprint