Background proton fluxes are not constant – Forbush decrease observed by GOES 11 before the 2005-01-20 event. In the higher energy channels P8–11, the background fluxes on January 19 and the start of the 20th are suppressed compared to the background levels observed on January 17 and the days prior. Dygraph was used with a rolling average of 100 points from the uncorrected 5-min averaged flux.