GOES - X-ray flare-like events
             Daily summary
from 20131220 1900 to 20131221 1112  (YYYYMMDD hhmm UT)
 
   date     start-end time       class  log10(X)
(YYYYMMDD)     (hhmm UT)
    20131220    1900 - 1112          C    -5.0334
 
 
Used are solar X-ray fluxes measured by GOES 15 in the 1-8 Angstrom passband.