中国气象局：太阳活动区14274爆发X4.0级耀斑

Core Points - The solar activity region 14274 erupted an X4.0 class flare on November 14, marking the fifth X-class flare during its current rotation cycle [1] - The timing of the flare coincided with daytime in most parts of China, potentially affecting shortwave radio communications due to changes in the ionosphere [3] - A coronal mass ejection occurred, but its trajectory is relatively away from Earth, minimizing direct impact [3] Summary by Sections - Solar Activity: The X4.0 class flare is significant as it is the fifth occurrence in the current solar rotation cycle [1] - Impact on Communications: The flare's occurrence during daytime may lead to disruptions in shortwave radio communications due to ionospheric changes [3] - Future Predictions: There is an expectation of minor geomagnetic storms in the coming days, with a low likelihood of M-class or higher flares. The solar activity level is predicted to be low, with geomagnetic activity remaining mostly calm to mildly disturbed [5]