Table information for 'rob_spoca_ch.epn_core'

General

Table Description: SPoCA coronal holes

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

Resource Description: *** 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.

For a list of all services and tables belonging to this table's resource, see Information on resource 'SPoCA Coronal Hole'

Citing this table

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

@MISC{vo:rob_spoca_ch_epn,
  year=2022,
  title={{SPoCA} Coronal Hole},
  author={Freek Verstringe},
  url={https://vo-tap.oma.be/tableinfo/rob_spoca_ch.epn_core},
  howpublished={{VO} resource provided by the {KSB}-{ROB}}
}

Columns

Sorted by DB column index. [Sort alphabetically]

NameTable Head DescriptionUnitUCD
granule_uid Granule_uid Internal table row index, which must be unique within the table. Can be alphanumeric. N/A meta.id
granule_gid Granule_gid Common to granules of same type (e.g. same map projection, or geometry data products). Can be alphanumeric. N/A meta.id
obs_id Obs_id Associates granules derived from the same data (e.g. various representations/processing levels). Can be alphanumeric, may be the ID of original observation. N/A meta.id;obs
dataproduct_type Dataproduct_type The 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. [Note et_prod] N/A meta.code.class
target_name Target_name Standard IAU name of target (from a list related to target class), case sensitive N/A meta.id;src
target_class Target_class Type of target, from a controlled vocabulary. N/A src.class
time_min Time_min Acquisition start time (in JD), as UTC at time_refposition d time.start;obs
time_max Time_max Acquisition stop time (in JD), as UTC at time_refposition d time.end;obs
time_sampling_step_min Time_sampling_step_min Sampling time for measurements of dynamical phenomena, lower limit. s time.resolution;stat.min
time_sampling_step_max Time_sampling_step_max Sampling time for measurements of dynamical phenomena, upper limit s time.resolution;stat.max
time_exp_min Time_exp_min Integration time of the measurement, lower limit. s time.duration;obs.exposure;stat.min
time_exp_max Time_exp_max Integration time of the measurement, upper limit s time.duration;obs.exposure;stat.max
spectral_range_min Spectral_range_min Spectral range (frequency), lower limit. Hz em.freq;stat.min
spectral_range_max Spectral_range_max Spectral range (frequency), upper limit Hz em.freq;stat.max
spectral_sampling_step_min Spectral_sampling_step_min Spectral sampling step, lower limit. Hz em.freq;spect.binSize;stat.min
spectral_sampling_step_max Spectral_sampling_step_max Spectral sampling step, upper limit Hz em.freq;spect.binSize;stat.max
spectral_resolution_min Spectral_resolution_min Spectral resolution, lower limit. N/A spect.resolution;stat.min
spectral_resolution_max Spectral_resolution_max Spectral resolution, upper limit N/A spect.resolution;stat.max
c1min C1min Right Ascension (ICRS), lower limit. deg pos.eq.ra;stat.min
c1max C1max Right Ascension (ICRS), upper limit deg pos.eq.ra;stat.max
c2min C2min Declination (ICRS), lower limit. deg pos.eq.dec;stat.min
c2max C2max Declination (ICRS), upper limit deg pos.eq.dec;stat.max
c3min C3min Distance from coordinate origin, lower limit. AU pos.distance;stat.min
c3max C3max Distance from coordinate origin, upper limit AU pos.distance;stat.max
s_region S_region ObsCore-like footprint, valid for celestial, spherical, or body-fixed frames N/A pos.outline;obs.field
c1_resol_min C1_resol_min Resolution in the first coordinate, lower limit. deg pos.angResolution;stat.min
c1_resol_max C1_resol_max Resolution in the first coordinate, upper limit deg pos.angResolution;stat.max
c2_resol_min C2_resol_min Resolution in the second coordinate, lower limit. deg pos.angResolution;stat.min
c2_resol_max C2_resol_max Resolution in the second coordinate, upper limit deg pos.angResolution;stat.max
c3_resol_min C3_resol_min Resolution in the third coordinate, lower limit. AU pos.resolution;stat.min
c3_resol_max C3_resol_max Resolution in the third coordinate, upper limit AU pos.resolution;stat.max
spatial_frame_type Spatial_frame_type Flavor of coordinate system, defines the nature of coordinates. From a controlled vocabulary, where 'none' means undefined. N/A meta.code.class;pos.frame
incidence_min Incidence_min Incidence angle (solar zenithal angle) during data acquisition, lower limit. deg pos.incidenceAng;stat.min
incidence_max Incidence_max Incidence angle (solar zenithal angle) during data acquisition, upper limit deg pos.incidenceAng;stat.max
emergence_min Emergence_min Emergence angle during data acquisition, lower limit. deg pos.emergenceAng;stat.min
emergence_max Emergence_max Emergence angle during data acquisition, upper limit deg pos.emergenceAng;stat.max
phase_min Phase_min Phase angle during data acquisition, lower limit. deg pos.phaseAng;stat.min
phase_max Phase_max Phase angle during data acquisition, upper limit deg pos.phaseAng;stat.max
instrument_host_name Instrument_host_name Standard name of the observatory or spacecraft N/A meta.id;instr.obsty
instrument_name Instrument_name Standard name of instrument N/A meta.id;instr
measurement_type Measurement_type UCD(s) defining the data, with multiple entries separated by hash (#) characters. N/A meta.ucd
processing_level Processing_level Dataset-related encoding, or simplified CODMAC calibration level [Note et_cal] N/A meta.calibLevel
creation_date Creation_date Date of first entry of this granule N/A time.creation
modification_date Modification_date Date of last modification (used to handle mirroring) N/A time.processing
release_date Release_date Start of public access period N/A time.release
service_title Service_title Title of resource (an acronym really, will be used to handle multiservice results) N/A meta.title
datalink_url Datalink Link to a datalink document for this dataset N/A meta.ref.url
subobserver_longitude_min Subobserver_longitude_min Minimum sub-observer point longitude (sub-Earth for ground based observations) deg pos.bodyrc.lon;stat.min
subobserver_longitude_max Subobserver_longitude_max Maximum sub-observer point longitude (sub-Earth for ground based observations) deg pos.bodyrc.lon;stat.max
subobserver_latitude_min Subobserver_latitude_min Minimum sub-observer point latitude (sub-Earth for ground based observations) deg pos.bodyrc.lat;stat.min
subobserver_latitude_max Subobserver_latitude_max Maximum sub-observer point latitude (sub-Earth for ground based observations) deg pos.bodyrc.lat;stat.max
access_url Access_url URL of the data file, case sensitive. If present, then access_format and access_estsize are mandatory. N/A meta.ref.url;meta.file
access_format Access_format File format type (RFC 6838 Media Type a.k.a. MIME type) N/A meta.code.mime
access_estsize Access_estsize Estimated file size in kbyte. kbyte phys.size;meta.file
processing_level_desc Processing_level_desc Describes specificities of the processing level N/A meta.note
feature_name Feature_name Secondary name (can be standard name of region of interest) N/A meta.id;src;obs.field
publisher Publisher A short string identifying the entity running the data service used N/A meta.curation
spatial_coordinate_description Spatial_coordinate_description ID of specific coordinate system and version or properties. N/A meta.code.class;pos.frame
spatial_origin Spatial_origin Defines the frame origin N/A meta.ref;pos.frame
target_distance_min Target_distance_min Min observer-target distance km pos.distance;stat.min
target_distance_max Target_distance_max Max observer-target distance km pos.distance;stat.max
target_region Target_region Type of region or feature of interest N/A meta.id;src;obs.field
thumbnail_url Thumbnail_url URL of a thumbnail image with predefined size (png ~200 pix, for use in a client only) N/A meta.ref.url;meta.preview
time_scale Time_scale Defaults to UTC in data services; takes values from http://www.ivoa.net/rdf/time_scale otherwise N/A time.scale
ch_c1_centroid Ch_c1_centroid Helioprojective longitude of the centroid of the coronal hole deg pos.eq.ra;pos.centroid
ch_c2_centroid Ch_c2_centroid Helioprojective loatitude of the centroid of the coronal hole deg pos.eq.dec;pos.centroid
ch_area_projected Ch_area_projected Area of the coronal hole as seen by the observer arcsec**2 phys.area
ch_area_projected_error Ch_area_projected_error Uncertainety of the area of the coronal hole as seen by the observer arcsec**2 stat.error;phys.area
ch_area_deprojected Ch_area_deprojected Estimation of the area of the coronal hole on the solar photosphere km**2 phys.area
ch_area_deprojected_error Ch_area_deprojected_error Uncertainety of the estimation of the area of the coronal hole on the solar photosphere km**2 stat.error;phys.area
ch_area_pixels Ch_area_pixels Number of pixels of the coronal hole in the map pix phys.area;instr.pixel
ch_stat_aia_image Ch_stat_aia_image Image onto which the coronal hole statistics are computed N/A meta.id;obs.image
ch_stat_aia_sample_size Ch_stat_aia_sample_size Number of pixels of the cornal hole used to compute the statistics, the statistics are computed up to 0.95 solar radius pix meta.number;instr.pixel
ch_stat_aia_max Ch_stat_aia_max Maximum of pixels values of the coronal hole count.s**-1 phot.count;stat.max
ch_stat_aia_min Ch_stat_aia_min Minimum of pixels values of the coronal hole count.s**-1 phot.count;stat.min
ch_stat_aia_median Ch_stat_aia_median Median of pixels values of the coronal hole count.s**-1 phot.count;stat.median
ch_stat_aia_mean Ch_stat_aia_mean Mean of pixels values of the coronal hole count.s**-1 phot.count;stat.mean
ch_stat_aia_variance Ch_stat_aia_variance Variance of pixels values of the coronal hole count**2.s**-2 stat.variance;phot.count
ch_stat_aia_skewness Ch_stat_aia_skewness Skewness of pixels values of the coronal hole N/A stat.skewness;phot.count
ch_stat_aia_kurtosis Ch_stat_aia_kurtosis Kurtosis of pixels values of the coronal hole N/A stat.kurtosis;phot.count
ch_stat_aia_first_quartile Ch_stat_aia_first_quartile First quartile of pixels values of the coronal hole count.s**-1 stat.rank;phot.count
ch_stat_aia_third_quartile Ch_stat_aia_third_quartile Third quartile of pixels values of the coronal hole count.s stat.rank;phot.count
ch_stat_hmi_image Ch_stat_hmi_image Image onto which the coronal hole statistics are computed N/A meta.id;obs.image
ch_stat_hmi_sample_size Ch_stat_hmi_sample_size Number of pixels of the coronal hole used to compute the statistics, the statistics are computed up to 0.95 solar radius pix meta.number;instr.pixel
ch_stat_hmi_max Ch_stat_hmi_max Maximum of the magnetic field of the coronal hole G phys.magField;stat.max
ch_stat_hmi_min Ch_stat_hmi_min Minimum of the magnetic field of the coronal hole G phys.magField;stat.min
ch_stat_hmi_median Ch_stat_hmi_median Median of the magnetic field of the coronal hole G phys.magField;stat.median
ch_stat_hmi_mean Ch_stat_hmi_mean Mean of the magnetic field of the coronal hole G phys.magField;stat.mean
ch_stat_hmi_variance Ch_stat_hmi_variance Variance of the magnetic field of the coronal hole G**2 stat.variance;phys.magField
ch_stat_hmi_skewness Ch_stat_hmi_skewness Skewness of the magnetic field of the coronal hole N/A stat.skewness;phys.magField
ch_stat_hmi_kurtosis Ch_stat_hmi_kurtosis Kurtosis of the magnetic field of the coronal hole N/A stat.kurtosis;phys.magField
ch_stat_hmi_first_quartile Ch_stat_hmi_first_quartile First quartile of the magnetic field of the coronal hole G stat.rank;phys.magField
ch_stat_hmi_third_quartile Ch_stat_hmi_third_quartile Third quartile of the magnetic field of the coronal hole G stat.rank;phys.magField

Columns that are parts of indices are marked like this.

Other

The following services may use the data contained in this table:

VOResource

VO nerds may sometimes need VOResource XML for this table.

Notes

Copyright and such: This research has been made at the Royal Observatory of Belgium