Science Level 3 image data from the Compact Coronagraph-1 (CCOR-1) aboard the GOES-19 spacecraft, produced by the NOAA NCEI retrospective science processing pipeline. The data consist of background-subtracted white-light coronal images derived from Science Level 2 data by downsampling each image by a factor of two along each axis using a 2 by 2 pixel median operation. The images are provided in FITS format as 1024 by 960 pixel intensity arrays expressed in mean solar brightness (MSB), accompanied by pixel quality flag masks. The nominal cadence is approximately 15 minutes.

CCOR-1 Science Level 3 background-subtracted white-light coronal intensity stored in FITS extension #1 as a 1024 x 960 pixel compressed 32-bit floating-point image array. The image is derived from Science Level 2 data by downsampling by a factor of two along each axis using the median of 2 by 2 pixel blocks and is expressed in mean solar brightness (MSB). The image uses helioprojective solar coordinates with a zenithal polynomial (ZPN) projection and a plate scale of approximately 38.66 arcsec per pixel at the reference point. The CCOR-1 bandpass has a measured full width at half maximum (FWHM) of approximately 470 to 740 nm. The reference time is specified by the DATE-OBS FITS keyword.

Pixel quality flag mask associated with the Science Level 3 coronal intensity image in FITS extension #1. The mask is stored in FITS extension #2 as a 1024 x 960 pixel compressed 8-bit integer array. Quality flags identify viable pixels, low-vignetting regions, pixels below the detector linear range, correctable nonlinear response, saturated pixels, unreliable photometry, dead pixels or data downlink failures, and invalid pixels associated with Daily Median or Monthly Minimum background processing. Flag definitions are provided in the FITS header.