Summary table of databases at the Debrecen Observatory

The primary task of the Debrecen Heliophysical Observatory (DHO) has been the most detailed, reliable, and precise documentation of the solar photospheric activity. This long-term effort resulted in various solar catalogs based on ground-based and space-borne observations. The revised version of GPR catalog was converted to DPD format to create a homogeneous sunspot database covering more than 140 years. The database of images for the GPR era was completed with the full-disc drawings of the Hungarian historical observatories Ógyalla and Kalocsa (1872–1919) and with the polarity drawings of Mount Wilson Observatory. User-friendly web-presentations and on-line tools were developed to visualize and search data. The table below summarizes the main characteristics of the databases available at DHO.

Description of the columns:
Debrecen Photoheliographic Data (DPD) based on white-light full-disc observations taken at DHO and at the cooperating observatories
SOHO/MDI–Debrecen Data (SDD) based on the Michelson Doppler Imager (MDI) of the Solar and Heliospheric Observatory (SOHO)
SDO/HMI–Debrecen Data (HMIDD) based on the Helioseismic and Magnetic Imager (HMI) of the Solar Dynamics Observatory (SDO)
Quick-Look data based on SDO/HMI
Hungarian Histororical Solar Drawings (HHSD)
Greenwich Photoheliographic Results (GPR) revised and converted to DPD format
Table of the main attributes of solar databases available at the Debrecen Observatory with links to the related sites
DPD SDD HMIDD Quick-Look HHSD GPR revised
interval of data 1974– 1996–2010 2010–2014 2014– 1872–1919 1874-1976
cadence 1 day ≈1.5 hours 1 hour 1 day sporadic daily 1 day
type of photospheric observation ground-based space-borne space-borne space-borne ground-based ground-based
sunspot group data YES YES YES YES no YES
sunspot data YES YES YES YES no no
magnetic data of spots no YES YES no no no
tilt angle/magnetic tilt angle YES/no YES/YES YES/YES no/no no/no no/no
facular data no YES YES no no no
white-light/continuum images appended photographic/CCD MDI HMI HMI drawings drawings
magnetic observations appended YES YES YES YES no starting at 1917
online queries for spot data/tilt angles YES /YES YES/YES no/no no/no no/no YES/no
News on the upgrades of these databases can be found here.

DATA POLICY: The detailed description of the databases listed here can be found in the following article:
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, 3081-3102, 2016, DOI: 10.1007/s11207-016-0930-1
If any data or related on-line tools are used in any publications, please refer to the article above.

If the DPD or HMIDD data are used, please also refer to this article:
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
If any tilt angle data are used in any publications, please also refer to this article:
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


Contact person/PI of the DPD project: Tünde Baranyi (e-mail:baranyi[at]; Requests, comments, questions, bug-reporting, or suggestions for collaborative studies are welcome.

Thanks to all for support!

Heliophysical Observatory
Address: 4026 Debrecen, Poroszlay út 6.
Postal: 4010 Debrecen Pf. 30.
E-mail: (user)
Phone: +36-52-311-015

Konkoly Thege Miklós Astronomical Institute
Address: 1121 Budapest, Konkoly Thege Miklós út 15-17.
Postal: 1525 Budapest Pf. 67.
E-mail: (user)
Phone: +36-1-391-9320

Show-up Google map!