By Mark Daymont
Space Center Educator

"In 2009, cosmic ray intensities have increased 19 percent beyond anything we've seen in the past 50 years," said Richard Mewaldt of Caltech. "The increase is significant, and it could mean we need to re-think how much radiation shielding astronauts take with them on deep-space missions."
The surge, which poses no threat to Earth, was detected by NASA's ACE (Advanced Composition Explorer) spacecraft.
The cause of the surge is solar minimum, a deep lull in the sun's activity that began around 2007 and continues today. Researchers have long known that cosmic rays go up when solar activity goes down, because strong solar activity inflates and bolsters a protective bubble around our entire solar system.
Right now solar activity — marked by sunspots, solar flares and space storms — is as weak as it has been in modern times, setting the stage for what Mewaldt calls "a perfect storm of cosmic rays."
Russian security officers walk along the railroad tracks as the Soyuz rocket is rolled out to the launch pad Monday, Sept. 28, 2009 at the Baikonur Cosmodrome in Kazakhstan. The Soyuz is scheduled to launch the crew of Expedition 21 and a spaceflight participant on Sept. 30, 2009. Image Credit: NASA/Bill Ingalls