Definitions for "Solar Outage"
Solar outages can be accurately predicted and occur when the sun passes within the field of view of an antenna. See Rain Outage.
As a satellite receiver antenna is pointed towards the satellite, it also points at the hot sun. This results in thermal noise being picked up by the antenna.
The loss of reception that occurs when the sun is positioned directly behind a target satellite. When this occurs, solar noise drowns out the satellite signal and reception is lost.