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Space Weather News: Space weather effects on NASA missions

Space Weather News: Space weather effects on NASA missions

AR 2158 was very potent, giving off several major eruptions from Sep. 1-24, 2014 and resulting in a few episodes of strong solar radiation storms. The radiation storm on Sep. 1 is likely responsible for the star tracker reset on both STEREO A and STEREO B* (within 16 minutes of each other), IMU was triggered to power on (normally off). The radiation storm starting on 2014-09-10 due to the X1.6 flare and accompanying CME is likely the cause for the Dawn anomaly on 2014-09-11 – delays the start of the first science orbit at Ceres by about a month.