太阳X级耀斑爆发，20至21日可能出现较强地磁活动

Core Viewpoint - The article reports the occurrence of an X1.9-class solar flare from solar active region 14341, marking the first X-class flare of the sun in 2026 [2][8]. Group 1: Solar Flare Details - The solar flare occurred on January 19 at 02:09 Beijing time [2][8]. - The flare was accompanied by coronal mass ejection (CME), which was full halo due to the favorable position of the eruption area relative to Earth [4][10]. Group 2: Impact and Observations - The X-ray flux has since decreased, indicating the end of the flare event [4][10]. - The flare did not affect the ionosphere or shortwave radio communications in the corresponding regions as it occurred during nighttime in China [4][10]. - Strong geomagnetic activity is expected on January 20-21, coinciding with favorable conditions for aurora photography due to the snowy landscape and the moon's phase [6][12].