Physics, 63, 5, March 2001, 523-535, doi:10.1016/S1364-6826(00)00174-7 ↑ "Solar Sentinels - NASA Science". science.nasa.gov. Retrieved 2015-07-24. ↑ "Solar Flare Shuts Down Nozomi Mars Probe's Communication System | SpaceRef - Your Space Reference". www.spaceref.com. Retrieved 2015-07-24.