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:

Attribute

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
HTML platform	YES	YES	YES	YES	at GPR	YES
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

ACKNOWLEDGEMENTS

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