Table information for 'sidc_ssg.epn_core'

General

Table Description: SIDC sunspot group

This table is available for ADQL queries and through the TAP endpoint.

Resource Description: *** SIDC Sunspot Group *** This service provides a catalog of Sunspot Groups as evaluated by the SIDC forecaster on duty.

For a list of all services and tables belonging to this table's resource, see Information on resource 'SIDC SunspotGroup'

Citing this table

To cite the table as such, we suggest the following BibTeX entry:

@MISC{vo:sidc_ssg_epn_cor,
  year=2025,
  title={{SIDC} {SunspotGroup}},
  author={{PLACEHOLDER\_CREATOR}},
  url={https://vo-tap.oma.be/tableinfo/sidc_ssg.epn_core},
  howpublished={{VO} resource provided by the {ROB} Virtual Observatory Data Center}
}

This research has been made at the Royal Observatory of Belgium

Columns

Sorted by DB column index. [Sort alphabetically]

NameTable Head DescriptionUnitUCD
granule_gid Granule_gid Unique identifier for the sunspot group (SIDC SSG number) N/A meta.id
granule_uid Granule_uid Unique identifier for the individual (daily) evaluation of the SIDC SSG N/A meta.id
ssg_evaluationtime Ssg_evaluationtime (jd) Evaluation time of the Sunspot Group by the SIDC forecaster. This can be used as time_max (if needed) or as time_min if there is no detection time. d time
ssg_locationevaluationtime Ssg_locationevaluationtime (jd) Timestamp when the Stonyhurst approximate coordinates of the centre are obtained (either from the NOAA/UKMO evaluation or using HMI images at the specified time). d time.start
ssg_longitude_stonyhurst Ssg_longitude_stonyhurst Longitude of the approximate centre of the Sunspot Group using Stonyhurst coordinates. deg pos.bodyrc.lon
ssg_latitude_stonyhurst Ssg_latitude_stonyhurst Latitude of approximate centre of the Sunspot Group using Stonyhurst coordinates. deg pos.bodyrc.lat
ssg_mcintosh Ssg_mcintosh McIntosh classification of the SIDC Sunspot Group N/A meta.code.class
ssg_mtwilson Ssg_mtwilson MtWilson classification of the SIDC Sunspot Group N/A meta.code.class
ssg_zurich Ssg_zurich Zurich classification of the SIDC Sunspot Group N/A meta.code.class
ssg_area Ssg_area Area of the SIDC Sunspot Group. MSH phys.area
ssg_numberofspots Ssg_numberofspots Number of sunspots for this SIDC Sunspot Group. N/A meta.number
ssg_growth Ssg_growth Assign Growing, Decreasing, Stable to the SIDC Sunspot Group, based on the area change from the last evaluation. If the area increases/decreases by at least 15%, the group is considered to be Growing/Decreasing, otherwise it's Stable. N/A phys.area;stat.value
ssg_leading Ssg_leading Assign Leading, Trailing, Equal or Unipolar/Not evaluated to the largest sunspot of the SIDC Sunspot Group (which is not necessarily the westernmost/leading sunspot of the group. N/A meta.code.class
ssg_hasdecayed Ssg_hasdecayed True if the sunspot group has decayed (either disappeared from the visible disk or did not reappear after a rotation). This does not apply to sunspots rotating behind the west limb. N/A meta.code.class;phys.area
ssg_operatorid Ssg_operatorid ID of the operator/forecaster on duty (internally only) N/A meta.id
ssg_provider Ssg_provider Provider (always SIDC) N/A meta.code

Columns that are parts of indices are marked like this.

VOResource

VO nerds may sometimes need VOResource XML for this table.