Scientists have made significant progress in understanding the sources of radiation events that could impact human space-flight operations. Relativistic electron precipitation (REP) events are instances when high energy electrons move through areas of space at significant fractions of the speed of light. These REP events may pose challenges to human spaceflight, specifically during extravehicular activity (EVA).
Source:
https://phys.org/news/2020-10-trail-events-space-flight.html