[1] Safe mode is entered automatically upon the detection of a predefined operating condition or event that may indicate loss of control or damage to the spacecraft.
Cosmic rays penetrating spacecraft electrical systems can create false signals or commands and thus cause a trigger event.
Regaining attitude control, if lost, is the highest priority because it is necessary to maintain thermal balance and proper illumination of the solar panels.
The spacecraft attempts to maintain orientation with respect to the Sun for illumination of solar panels and for thermal management.
The spacecraft then awaits radio commands from its mission control center monitoring for signals on its low-gain omnidirectional antenna.