- When solar flares occur, high-energy protons reach the Earth. As these particles directly penetrate the satellites orbiting the Earth, they cause errors in various electronic devices. This phenomenon is called Single Event Upsets (SEUs). The energy of protons is measured by using three energy levels: >=10MeV, >=50MeV, and >=100MeV.
[Minor] Protons more than 10 pfu/ more than 10 Mev [Pfu] Proton flux unit