New sunspot shows increased activity

After nearly a week of quiet, sunspot AR2824 is active again. The C4.8 impulsive flare in the late hours of May 21 was followed by an even more intense C6.1 flare on May 22.

An image from NASA’s Solar Dynamics Observatory shows an ultraviolet flare from the C6.1 flare.

AR2824 is now bombarding Earth with pulses of ultraviolet radiation. The ionization waves that swept through Earth’s upper atmosphere caused shortwave radio broadcasts over North America on May 21 (map) and southeast Asia on May 22.

Radio operators, aviators, and sailors may have noticed unusual propagation on frequencies below ~20 MHz.

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