Forbush event
A Forbush event (also: Forbush effect ) is an observed sudden drop in the high-energy cosmic rays after a solar eruption . This happens because the solar wind keeps these high-energy particles away from the earth. The event can easily be detected with a particle detector.
The namesake for the term Forbush event was the geophysicist Scott E. Forbush , who researched cosmic rays in the 1930s and 1940s and discovered this effect.