space radiation rising
Radiation hazards are likely to increase for air travelers and spacefarers in coming years due to changes in solar activity, researchers say.
Cosmic rays from deep space and high-energy particles from the sun can be hazardous to astronauts and also can expose airline crews and passengers to radiation, as well as damage spacecraft, aircraft and satellites. Solar magnetic fields protect Earth by repelling incoming galactic cosmic rays, but the period of high solar magnetic activity known as the grand solar maximum that persisted throughout the Space Age now appears to be coming to an end, and solar particle levels might start rising at the same time.
Cosmic rays constantly bombard the Earth from deep space, but solar activity is dependent on the sun's regular weather cycle. The sun is currently approaching the peak of its current 11-year cycle, called Solar Cycle 24. That peak will occur in 2013, NASA has said.
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