CH serviceivo://ksb-orb.dc/rob_spoca_ch/q/spoca_ch_drSIDC: Solar Influences Data analysis CenterBenjamin Mampaey2026-04-09T09:04:36ZVeronique Delouille

Royal Observatory of Belgium, Avenue circulaire 3, 1180 Bruxelles, BELGIQUE

sidc-support@oma.bethe-sunsolar-atmospheresolar-physicssolar-system-astronomy *** SPoCA Coronal Hole *** This service provides a catalog of Coronal Holes obtained with the Spatial Possibilitistic Clustering Algorithm (SPoCA). Level 2 AIA 19.3nm images (calibrated and corrected for degradation) are used, at a cadence of one AIA image every 6 hours. Only coronal holes older than three days are being reported. Bounding box and characteristics such as areas and pixel intensity statistics, on AIA 19.3nm and HMI magnetogram images are provided.http://vo-tap.oma.be/rob_spoca_ch/q/spoca_ch_dr/infoGeneralUniversityResearchThis research has been made at the Royal Observatory of Belgiumhttp://vo-tap.oma.be/rob_spoca_ch/q/dl/dlmetaGETapplication/x-votable+xml;content=datalinkIDThe publisher DID of the dataset of interestmeta.id;meta.maincharresponseformatFile format requested for output.meta.code.mimecharmaxrecMaximum number of records returned. Pass 0 to retrieve service parameters.integerverbExhaustiveness of column selection. VERB=1 only returns the most important columns, VERB=2 selects the columns deemed useful to the average user, VERB=3 returns a table with all available columns.integerrob_spoca_ch *** SPoCA Coronal Hole *** This service provides a catalog of Coronal Holes obtained with the Spatial Possibilitistic Clustering Algorithm (SPoCA). Level 2 AIA 19.3nm images (calibrated and corrected for degradation) are used, at a cadence of one AIA image every 6 hours. Only coronal holes older than three days are being reported. Bounding box and characteristics such as areas and pixel intensity statistics, on AIA 19.3nm and HMI magnetogram images are provided.rob_spoca_ch.epn_coreSPoCA coronal holesivo://ivoa.net/std/epntap#table-2.0granule_uidInternal table row index, which must be unique within the table. Can be alphanumeric.meta.idcharindexedprimarygranule_gidCommon to granules of same type (e.g. same map projection, or geometry data products). Can be alphanumeric.meta.idcharobs_idAssociates granules derived from the same data (e.g. various representations/processing levels). Can be alphanumeric, may be the ID of original observation.meta.id;obschardataproduct_typeThe high-level organization of the data product, from a controlled vocabulary (e.g., 'im' for image, sp for spectrum). Multiple terms may be used, separated by # characters.meta.code.classcharnullabletarget_nameStandard IAU name of target (from a list related to target class), case sensitivemeta.id;srccharnullabletarget_classType of target, from a controlled vocabulary.src.classcharnullabletime_minAcquisition start time (in JD), as UTC at time_refpositiondtime.start;obsdoublenullabletime_maxAcquisition stop time (in JD), as UTC at time_refpositiondtime.end;obsdoublenullabletime_sampling_step_minSampling time for measurements of dynamical phenomena, lower limit.stime.resolution;stat.mindoublenullabletime_sampling_step_maxSampling time for measurements of dynamical phenomena, upper limitstime.resolution;stat.maxdoublenullabletime_exp_minIntegration time of the measurement, lower limit.stime.duration;obs.exposure;stat.mindoublenullabletime_exp_maxIntegration time of the measurement, upper limitstime.duration;obs.exposure;stat.maxdoublenullablespectral_range_minSpectral range (frequency), lower limit.Hzem.freq;stat.mindoublenullablespectral_range_maxSpectral range (frequency), upper limitHzem.freq;stat.maxdoublenullablespectral_sampling_step_minSpectral sampling step, lower limit.Hzem.freq;spect.binSize;stat.mindoublenullablespectral_sampling_step_maxSpectral sampling step, upper limitHzem.freq;spect.binSize;stat.maxdoublenullablespectral_resolution_minSpectral resolution, lower limit.spect.resolution;stat.mindoublenullablespectral_resolution_maxSpectral resolution, upper limitspect.resolution;stat.maxdoublenullablec1minRight Ascension (ICRS), lower limit.degpos.eq.ra;stat.mindoublenullablec1maxRight Ascension (ICRS), upper limitdegpos.eq.ra;stat.maxdoublenullablec2minDeclination (ICRS), lower limit.degpos.eq.dec;stat.mindoublenullablec2maxDeclination (ICRS), upper limitdegpos.eq.dec;stat.maxdoublenullablec3minDistance from coordinate origin, lower limit.AUpos.distance;stat.mindoublenullablec3maxDistance from coordinate origin, upper limitAUpos.distance;stat.maxdoublenullables_regionObsCore-like footprint, valid for celestial, spherical, or body-fixed framespos.outline;obs.fieldcharnullablec1_resol_minResolution in the first coordinate, lower limit.degpos.angResolution;stat.mindoublenullablec1_resol_maxResolution in the first coordinate, upper limitdegpos.angResolution;stat.maxdoublenullablec2_resol_minResolution in the second coordinate, lower limit.degpos.angResolution;stat.mindoublenullablec2_resol_maxResolution in the second coordinate, upper limitdegpos.angResolution;stat.maxdoublenullablec3_resol_minResolution in the third coordinate, lower limit.AUpos.resolution;stat.mindoublenullablec3_resol_maxResolution in the third coordinate, upper limitAUpos.resolution;stat.maxdoublenullablespatial_frame_typeFlavor of coordinate system, defines the nature of coordinates. From a controlled vocabulary, where 'none' means undefined.meta.code.class;pos.framecharnullableincidence_minIncidence angle (solar zenithal angle) during data acquisition, lower limit.degpos.incidenceAng;stat.mindoublenullableincidence_maxIncidence angle (solar zenithal angle) during data acquisition, upper limitdegpos.incidenceAng;stat.maxdoublenullableemergence_minEmergence angle during data acquisition, lower limit.degpos.emergenceAng;stat.mindoublenullableemergence_maxEmergence angle during data acquisition, upper limitdegpos.emergenceAng;stat.maxdoublenullablephase_minPhase angle during data acquisition, lower limit.degpos.phaseAng;stat.mindoublenullablephase_maxPhase angle during data acquisition, upper limitdegpos.phaseAng;stat.maxdoublenullableinstrument_host_nameStandard name of the observatory or spacecraftmeta.id;instr.obstycharnullableinstrument_nameStandard name of instrumentmeta.id;instrcharnullablemeasurement_typeUCD(s) defining the data, with multiple entries separated by hash (#) characters.meta.ucdcharnullableprocessing_levelDataset-related encoding, or simplified CODMAC calibration levelmeta.calibLevelintcreation_dateDate of first entry of this granuletime.creationcharnullablemodification_dateDate of last modification (used to handle mirroring)time.processingcharnullablerelease_dateStart of public access periodtime.releasecharnullableservice_titleTitle of resource (an acronym really, will be used to handle multiservice results)meta.titlecharnullabledatalink_urlLink to a datalink document for this datasetmeta.ref.urlcharnullablesubobserver_longitude_minMinimum sub-observer point longitude (sub-Earth for ground based observations)degpos.bodyrc.lon;stat.mindoublenullablesubobserver_longitude_maxMaximum sub-observer point longitude (sub-Earth for ground based observations)degpos.bodyrc.lon;stat.maxdoublenullablesubobserver_latitude_minMinimum sub-observer point latitude (sub-Earth for ground based observations)degpos.bodyrc.lat;stat.mindoublenullablesubobserver_latitude_maxMaximum sub-observer point latitude (sub-Earth for ground based observations)degpos.bodyrc.lat;stat.maxdoublenullableaccess_urlURL of the data file, case sensitive. If present, then access_format and access_estsize are mandatory.meta.ref.url;meta.filecharnullableaccess_formatFile format type (RFC 6838 Media Type a.k.a. MIME type)meta.code.mimecharnullableaccess_estsizeEstimated file size in kbyte.kbytephys.size;meta.fileintnullableprocessing_level_descDescribes specificities of the processing levelmeta.notecharnullablefeature_nameSecondary name (can be standard name of region of interest)meta.id;src;obs.fieldcharnullablepublisherA short string identifying the entity running the data service usedmeta.curationcharnullablespatial_coordinate_descriptionID of specific coordinate system and version or properties.meta.code.class;pos.framecharnullablespatial_originDefines the frame originmeta.ref;pos.framecharnullabletarget_distance_minMin observer-target distancekmpos.distance;stat.mindoublenullabletarget_distance_maxMax observer-target distancekmpos.distance;stat.maxdoublenullabletarget_regionType of region or feature of interestmeta.id;src;obs.fieldcharnullablethumbnail_urlURL of a thumbnail image with predefined size (png ~200 pix, for use in a client only)meta.ref.url;meta.previewcharnullabletime_scaleDefaults to UTC in data services; takes values from http://www.ivoa.net/rdf/time_scale otherwisetime.scalecharnullablech_c1_centroidHelioprojective longitude of the centroid of the coronal holedegpos.eq.ra;pos.centroiddoublenullablech_c2_centroidHelioprojective loatitude of the centroid of the coronal holedegpos.eq.dec;pos.centroiddoublenullablech_area_projectedArea of the coronal hole as seen by the observerarcsec**2phys.areadoublenullablech_area_projected_errorUncertainety of the area of the coronal hole as seen by the observerarcsec**2stat.error;phys.areadoublenullablech_area_deprojectedEstimation of the area of the coronal hole on the solar photospherekm**2phys.areadoublenullablech_area_deprojected_errorUncertainety of the estimation of the area of the coronal hole on the solar photospherekm**2stat.error;phys.areadoublenullablech_area_pixelsNumber of pixels of the coronal hole in the mappixphys.area;instr.pixelintnullablech_stat_aia_imageImage onto which the coronal hole statistics are computedmeta.id;obs.imagecharnullablech_stat_aia_sample_sizeNumber of pixels of the cornal hole used to compute the statistics, the statistics are computed up to 0.95 solar radiuspixmeta.number;instr.pixelintch_stat_aia_maxMaximum of pixels values of the coronal holecount.s**-1phot.count;stat.maxdoublenullablech_stat_aia_minMinimum of pixels values of the coronal holecount.s**-1phot.count;stat.mindoublenullablech_stat_aia_medianMedian of pixels values of the coronal holecount.s**-1phot.count;stat.mediandoublenullablech_stat_aia_meanMean of pixels values of the coronal holecount.s**-1phot.count;stat.meandoublenullablech_stat_aia_varianceVariance of pixels values of the coronal holecount**2.s**-2stat.variance;phot.countdoublenullablech_stat_aia_skewnessSkewness of pixels values of the coronal holestat.skewness;phot.countdoublenullablech_stat_aia_kurtosisKurtosis of pixels values of the coronal holestat.kurtosis;phot.countdoublenullablech_stat_aia_first_quartileFirst quartile of pixels values of the coronal holecount.s**-1stat.rank;phot.countdoublenullablech_stat_aia_third_quartileThird quartile of pixels values of the coronal holecount.sstat.rank;phot.countdoublenullablech_stat_hmi_imageImage onto which the coronal hole statistics are computedmeta.id;obs.imageunicodeCharnullablech_stat_hmi_sample_sizeNumber of pixels of the coronal hole used to compute the statistics, the statistics are computed up to 0.95 solar radiuspixmeta.number;instr.pixelintnullablech_stat_hmi_maxMaximum of the magnetic field of the coronal holeGphys.magField;stat.maxdoublenullablech_stat_hmi_minMinimum of the magnetic field of the coronal holeGphys.magField;stat.mindoublenullablech_stat_hmi_medianMedian of the magnetic field of the coronal holeGphys.magField;stat.mediandoublenullablech_stat_hmi_meanMean of the magnetic field of the coronal holeGphys.magField;stat.meandoublenullablech_stat_hmi_varianceVariance of the magnetic field of the coronal holeG**2stat.variance;phys.magFielddoublenullablech_stat_hmi_skewnessSkewness of the magnetic field of the coronal holestat.skewness;phys.magFielddoublenullablech_stat_hmi_kurtosisKurtosis of the magnetic field of the coronal holestat.kurtosis;phys.magFielddoublenullablech_stat_hmi_first_quartileFirst quartile of the magnetic field of the coronal holeGstat.rank;phys.magFielddoublenullablech_stat_hmi_third_quartileThird quartile of the magnetic field of the coronal holeGstat.rank;phys.magFielddoublenullable