2 ‘intense’ solar flares in just 7 hours, the strongest in months, knock out radio signals on Earth: NASA New York Post Sun Releases 2 Strong Solar Flares NASA Science (.gov) X2.5 flare (R3-Strong) observed from near NW solar limb. NOAA Space Weather Prediction Center (.gov) Sun fires two X-class flares within hours, hits radio signals Interesting Engineering Sun unleashes 2 colossal X-flares within 7 hours of each other, knocking out radio signals on Earth Space