Description
北京时间2022年4月20日11:46，活动区AR2992（S30W90）爆发了1个X级X射线耀斑，于12:03结束，级别为X2.2级。AR2992已于昨日转出可视日面，爆发位置在日面西边缘。此外，AR2993和AR2994较为活跃，产生多个M级耀斑。预计未来几天，AR2993和AR2994仍将比较活跃，可能爆发M级及以上级别耀斑。
An X2.2 flare (R3-Strong Radio Blackout) occurred at 11:57pm EDT on 19 April, 2022 (20/0357 UTC). The flare erupted from a region just beyond the southwest limb of the Sun – likely former Region 2992. The strong flare was associated with multiple bursts on specific radio frequencies to include a burst of 509 solar flux units on 2695 MHz. Additionally, a Type II radio sweep was detected by the USAF Radio Solar Telescope Network (RSTN), with an estimated velocity of 1630 km/s. This radio signature is often indicative of a potential coronal mass ejection (CME). SWPC forecasters are waiting for available coronagraph imagery from the NASA/SOHO LASCO instrument to confirm if a CME took place, and if so, analyze accordingly. However, as the source region of the flare was beyond the southwest limb, initial analysis suggests any CME is unlikely to have an Earth-directed component.
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资料来源：
NOAA-SWPC：https://www.swpc.noaa.gov/
中科院空间环境预报中心：http://www.sepc.ac.cn/
SDO-太阳动力学天文台：https://sdo.gsfc.nasa.gov/
SEEDS-太阳爆发事件探测系统：http://spaceweather.gmu.edu/seeds/