From the article I posted earlier in the thread.
“Microscopic current flows can flip a computer memory position from ‘1’ to ‘0’ or cause some components, or an entire spacecraft system, to switch-on when it is not supposed to. When this happens, it is called a ‘Single Event Upset’ or SEU, and like water they come in two flavors: hard and soft.
A hard SEU actually does unreparable physical damage to a junction or part of a microcircuit. A soft SEU merely changes a binary value stored in a device’s memory, and this can be corrected by simply ‘re-booting’ the device. Engineers on the ground cannot watch the circuitry of a satellite as it undergoes a discharge or SEU event, but they can monitor the functions of the satellite.
When these change suddenly, and without any logical or human cause, they are called ‘Satellite Anomalies’. They happen a lot more often than you will ever read about in the news media”
