The production of data is done within the WP2(Photosphere) of SOTERIA (SOlar-TERrestrial Investigations and Archives) project supported by the European Community's Seventh Framework Program (FP7/2007-2013 ) under grant agreement  No. 218816 (SP1-Cooperation/1 Nov 2008 - 31 Oct 2011).   The primary aim is to cover the entire SOHO-era with the most detailed data of sunspots, sunspot groups and photospheric faculae derived from MDI (Michelson Doppler Imager) continuum images with a ~1 image/hour temporal resolution.

Data and Image Products: (All ftp)

Year	Selected original Level 1.8. full-disk images		Processed enlarged full-disk images		Sunspot and sunspot group data				Facular data
Graphical presentation	Continuum intensity (fits.gz)	Magnetograms (fits.gz)	Contrast enhanced intensity images in jpg format (solar north at the top)	Magnetograms in jpg format (solar north at the top)	Full-disk catalogue of sunspots (txt)	Catalogue of sunspot and sunspot group data (txt)	Images of sunspot groups (jpg)	Images  of sunspot groups (fit)	Full-disk catalogue of continuum faculae (txt)
1996	1996I	1996M	1996fd_jpg	1996M_jpg	fdSDD1996	SDD1996	1996group_jpg	1996group_fits	facSDD1996
1997	1997I	1997M	not yet available	1997M_jpg	not yet available	not yet available	not yet available	not yet available	not yet available
1998	1998I	1998M	not yet available	1998M_jpg	not yet available	not yet available	not yet available	not yet available	not yet available
1999	1999I	1999M	not yet available	1999M_jpg	not yet available	not yet available	not yet available	not yet available	not yet available
2000	2000I	2000M	not yet available	2000M_jpg	not yet available	not yet available	not yet available	not yet available	not yet available
2001	2001I	2001M	not yet available	2001M_jpg	not yet available	not yet available	not yet available	not yet available	not yet available
2002	2002I	2002M	not yet available	2002M_jpg	not yet available	not yet available	not yet available	not yet available	not yet available
2003	2003I	2003M	not yet available	2003M_jpg	not yet available	not yet available	not yet available	not yet available	not yet available
2004	2004I	2004M	not yet available	2004M_jpg	not yet available	not yet available	not yet available	not yet available	not yet available
2005	2005I	2005M	not yet available	2005M_jpg	not yet available	not yet available	not yet available	not yet available	not yet available
2006	2006I	2006M	not yet available	2006M_jpg	not yet available	not yet available	not yet available	not yet available	not yet available
2007	2007I	2007M	not yet available	2007M_jpg	not yet available	not yet available	not yet available	not yet available	not yet available
2008	2008I	2008M	2008fd_jpg	2008M_jpg	fdSDD2008	SDD2008	2008group_jpg	2008group_fits	not yet available
2009	2009I	2009M	2009fd_jpg	2009M_jpg	fdSDD2009	SDD2009	not yet available	not yet available	not yet available
Quick-Look 2010	2010I	2010M	2010fd_jpg	2010M_jpg	not yet available	QL_SDD2010	2010group_jpg	2010group_fits	not yet available

The research leading to these results has received funding from the European Community's Seventh Framework Programme (FP7/2007-2013) under grant agreement n° 218816.

Format of the SOHO/MDI - Debrecen Sunspot Data (SDD) catalogue:
 
The same method is used as in the case of production of Debrecen Photoheliographic Data (DPD) sunspot catalogue, and the software of the DPD has been suitably modified in order to adapt to SOHO/MDI full-disk continuum (Ic) images . The SDD yields the position and area data of all observable sunspots on an about hourly basis (30 min =< t < day) of MDI observations as well as the digitized images of sunspot groups. The text files contain the sunspot data (see SDDformat.txt), and the images of the sunspot groups show the measured spots.  The full-disk facular data have the same format as full-disk sunspot data, but umbral areas are obviously not measured for faculae, and the first column of magnetic data contains the LOS magnetic field value at the brightest pixel within the facular contour in the intensity image.


We use the Full Disk Continuum images (fd_Ic_01h) from the Hourly Data Sets (from High Rate Science) Level 1.8. In this data set there are observations with different time resolution (from one/day to one/min) in different time intervals. In the latest years usually there is one Ic image per hour but not in every hours. To get a data set with a more or less regular time resolution that contains the most available images we have decided to use one image/hour time resolution. The best available Ic image is chosen within the time interval (hour - 30 min, hour + 30 min) which is the closest to the center of the time interval. If there is no Ic image in a given interval, the gap is filled with a Full Disk Continuum filtergram image (fd_I0_01h) when it is available.  The measured Ic and I0 images are also published in our FTP archive in the original form. File name convention: I_yyyymmdd_hhmmss. During the measuring process the selected full disk intensity images are enlarged (3x), filtered, corrected for limb darkening, and transformed to negative.  If the P_ANGLE of the image is  180 degree then  the  processed image is rotated  to  the  normal  position, otherwise  the  image preserves its original orientation.

The large amount of the available magnetograms allows for us to choose the magnetogram closest in time to the Ic image, and determine the magnetic field of the spots. Mean values of the line-of-sight magnetic field are computed if Ic images and magnetograms are available within 50 min. The best available magnetograms closest in time to the intensity images are chosen from the merged data sets of Full Disk Magnetograms of the Hourly Data Sets (from High Rate Science) and Daily Data Sets (from Low Rate Science & Synoptic) Level 1.8 (fd_M_01h and fd_M_96m_01d). All the magnetograms used in the catalogue and are available on-line. File name convention: M_yyyymmdd_hhmmss.

The set of images contains  the Ic images with the nearest magnetograms  selected after using  quality-filters and time sequence criteria.  If an hourly data is missing, it means that there is no Ic observation within the given time interval, or the available Ic observation is not measurable (perfect), or there are no measurable Ic images and magnetograms available with less than 50 min time difference.

The full-disk version of the SDD catalogue (fdSDD) is based on the same hourly time resolution MDI observations, but the spots are numbered by the computer program on the basis of their longitude and they is not assigned to sunspot groups. In the fdSDD catalogue all sunspots have their area, position and magnetic field values similar to SDD sunspot group catalogue. In this case the "g" raws are sums over the whole disk, which have no real physical meaning, but these raws are remained unchanged to
The  previous version of SDD was produced during the ESA-PECS project entitled "SOHO/VIRGO, MDI - DPD catalogue studies" (2004-2007). The data (oldSDD1996) and images (old1996jpg) for 1996 are still available as samples for the results of this project.
The whole set of data is reprocessed during the SOTERIA project because the MDI magnetograms were recalibrated at the end of 2008.


Contact person: T. Baranyi (baranyi[at]tigris.unideb.hu)
Last modified: 2010-01-26
_______________________________________________________________________________________________________________

Related sites:

MDI home page

• Quick-look Magnetogram Summary Images (sampled 15 / day)
• Magnetogram GIF Images (sampled 15 / day)
• Intensitygram GIF Images With Limb-Darkening Removed (sampled 4 / day)
• Intensitygram GIF Images With Limb-Darkening (sampled 4 / day)

Solar Feature Catalogue

The Solar and Heliospheric Observatory -- SOHO