2.2.2 spase://INAF/DisplayData/OAC/OACT/H-ALPHA OAC H-alpha Solar Images 2021-02-12T20:40:18Z H-alpha solar imagery from Osservatorio Astrofisica di Catania (OAC), Sicily, Italy spase://SMWG/Person/Daniele.Spadaro GeneralContact spase://VSPO/DisplayData/P_OAC_HDR_HALPHA spase://VSPO/DisplayData/OAC/OACT/H-ALPHA spase://NASA/DisplayData/OAC/OACT/H-ALPHA spase://SMWG/Repository/OAC Online Open OAC site http://woac.ct.astro.it/ Virtual Solar Observatory https://www.virtualsolar.org/ TIFF CALIBRATED spase://SMWG/Instrument/OAC/OACT ImageIntensity 2002-02-26T00:00:00 -P3D Data are current to within days. Optical Sun Sun.Photosphere