SDO GAIA-DEM

SDO GAIA-DEMgaia_dem.epn_corivo://idoc/medoc/gaia_dem/q/epn_coreIDOCIDOC: Integrated Data and Operating Center2026-04-21T01:13:05ZEric Buchlin

Institut d'Astrophysique Spatiale - Campus Universitaire d'Orsay - France

idoc-vo@ias.u-psud.frthe-sun GAIA-DEM GAIA-DEM is a database of Differential Emission Measure (DEM) maps. The DEM is a measure of the thermal structure of the coronal plasma, representing the quantity of light emitting plasma along the line of sight, at different temperatures. In GAIA-DEM, the DEM is modelled by a specific function of temperature, namely a Gaussian of the logarithm of electron temperature. GAIA-DEM maps are then maps of the DEM maximum temperature, of the DEM integral (total Emission Measure), and DEM width (in temperature). These maps are obtained by inversion from the SDO/AIA EUV images in 6 coronal channels (9.4, 13.1, 17.1, 19.3, 21.1, and 33.5 nm). In addition, maps of the χ² for the inversion are provided. GAIA-DEM is available from a specific interface at <a href="http://medoc-dem.ias.u-psud.fr/">http://medoc-dem.ias.u-psud.fr</a>, as well as part of the generic MEDOC interface which is currently located at <a href="https://idoc-medoc.ias.u-psud.fr/">https://idoc-medoc.ias.u-psud.fr</a>. These interfaces are based on the CNES SiTools2 framework. GAIA-DEM is also available from IDL and Python scripts, using a specialization of the generic SiTools2 IDL and Python clients developed by MEDOC.https://idoc-dachs.ias.u-psud.fr/tableinfo/gaia_dem.epn_coreGeneralUniversityResearchIsServedByIDOC: Integrated Data and Operating Center TAP servicehttps://idoc-dachs.ias.u-psud.fr/tapgaia_demSDO GAIA-DEM GAIA-DEM GAIA-DEM is a database of Differential Emission Measure (DEM) maps. The DEM is a measure of the thermal structure of the coronal plasma, representing the quantity of light emitting plasma along the line of sight, at different temperatures. In GAIA-DEM, the DEM is modelled by a specific function of temperature, namely a Gaussian of the logarithm of electron temperature. GAIA-DEM maps are then maps of the DEM maximum temperature, of the DEM integral (total Emission Measure), and DEM width (in temperature). These maps are obtained by inversion from the SDO/AIA EUV images in 6 coronal channels (9.4, 13.1, 17.1, 19.3, 21.1, and 33.5 nm). In addition, maps of the χ² for the inversion are provided. GAIA-DEM is available from a specific interface at <a href="http://medoc-dem.ias.u-psud.fr/">http://medoc-dem.ias.u-psud.fr</a>, as well as part of the generic MEDOC interface which is currently located at <a href="https://idoc-medoc.ias.u-psud.fr/">https://idoc-medoc.ias.u-psud.fr</a>. These interfaces are based on the CNES SiTools2 framework. GAIA-DEM is also available from IDL and Python scripts, using a specialization of the generic SiTools2 IDL and Python clients developed by MEDOC.gaia_dem.epn_core GAIA-DEM GAIA-DEM is a database of Differential Emission Measure (DEM) maps. The DEM is a measure of the thermal structure of the coronal plasma, representing the quantity of light emitting plasma along the line of sight, at different temperatures. In GAIA-DEM, the DEM is modelled by a specific function of temperature, namely a Gaussian of the logarithm of electron temperature. GAIA-DEM maps are then maps of the DEM maximum temperature, of the DEM integral (total Emission Measure), and DEM width (in temperature). These maps are obtained by inversion from the SDO/AIA EUV images in 6 coronal channels (9.4, 13.1, 17.1, 19.3, 21.1, and 33.5 nm). In addition, maps of the χ² for the inversion are provided. GAIA-DEM is available from a specific interface at <a href="http://medoc-dem.ias.u-psud.fr/">http://medoc-dem.ias.u-psud.fr</a>, as well as part of the generic MEDOC interface which is currently located at <a href="https://idoc-medoc.ias.u-psud.fr/">https://idoc-medoc.ias.u-psud.fr</a>. These interfaces are based on the CNES SiTools2 framework. GAIA-DEM is also available from IDL and Python scripts, using a specialization of the generic SiTools2 IDL and Python clients developed by MEDOC.ivo://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.titlecharnullableaccess_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.fileintnullablethumbnail_urlURL of a thumbnail image with predefined size (png ~200 pix, for use in a client only)meta.ref.url;meta.previewcharnullablefile_nameName of the data file only, case sensitivemeta.id;meta.filecharnullablepublisherA short string identifying the entity running the data service usedmeta.curationcharnullablespatial_coordinate_descriptionID of specific coordinate system and version / propertiesmeta.code.class;pos.framecharnullablespatial_originmeta.ref;pos.framemeta.code.class;pos.framecharnullabletarget_distance_minMin observer-target distancekmpos.distance;stat.mindoublenullabletarget_distance_maxMax observer-target distancekmpos.distance;stat.maxdoublenullabletarget_time_minMin observing time in target frametime.start;srccharnullabletarget_time_maxMax observing time in target frametime.end;srccharnullabledatalink_urlDatalinks and services for this objetmeta.ref.urlcharnullable