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CH service title

*** 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 Virtual Observatory Data Center TAP service

The ROB Virtual Observatory Data Center's TAP end point. The Table Access Protocol (TAP) lets you execute queries against our database tables, inspect various metadata, and upload your own data. It is thus the VO's premier way to access public data holdings. Tables exposed through this endpoint include: datalink, epn_core, tracking from the rob_spoca_ch schema, columns, groups, key_columns, keys, schemas, tables from the tap_schema schema, epn_core, epn_links from the uset_sunspot_drawing schema, epn_core from the uset_sunspot_group schema.

USET Drawings

*** USET sunspot drawing *** The Uccle Solar Equatorial Table (USET) facility at the Royal Observatory of Belgium has gathered an uninterrupted series of sunspot drawings since year 1941. This collection continues to be updated when weather permits. This table provides information about these drawings.
USET Drawings

USET links drawings and sunspots
USET Drawings form

USET Drawing form
USET Group form

USET Group form
USET Groups

*** USET Groups *** Values in the USET sunspot group catalog are derived from the solar drawings obtained by the Uccle Solar Equatorial Table (USET) facility that is located at the Royal Observatory of Belgium. The USET sunspot group catalog covers 82 years of observations in 2021, and is updated every day. A home-made software (DigiSun) written in Python is used to derive quantities such as location and areas from the sunspot drawings.

ROB Virtual Observatory Data Center