https://phys.org/news/2018-05-case-relativistic-particles-nasa-missions.html

Establishing the main cause of the radiation belt enhancements provides key information for models that forecast space weather—and thus protect our technology in space.

"We've had studies in the past that look at individual events, so we knew local acceleration was going to be important for some of the events, but I think it was a surprise just how important local acceleration was," said Alex Boyd, lead author and researcher at New Mexico Consortium, Los Alamos, New Mexico. "The results finally address this main controversy we've been having about the radiation belts for a number of years."