On January 27th, 2012, the Curiosity spacecraft was hit with an intense solar radiation storm. No need to worry, this was part of its mission. Using its Radiation Assessment Detector, Curiosity was able to count the multitude of particles, protons, cosmic rays, and neutrons that bombarded it. With this data, NASA scientists will be able to determine the type of radiation humans could be exposed during a trip to Mars.
More information is available on NASA Science News.