EARTH-DIRECTED SOLAR FLARE: On Feb. 13th at 1738 UT, sunspot 1158 unleashed the strongest solar flare of the year so far, an M6.6-category blast. NASA’s Solar Dynamics Observatory recorded an intense flash of extreme ultraviolet radiation, circled below:
The eruption produced a loud blast of radio waves heard in shortwave receivers around the dayside of our planet. In New Mexico, amateur radio astronomer Thomas Ashcraft recorded these sounds at 19 to 21 MHz. “This was some of the strongest radio bursting of the new solar cycle,” he says. “What a great solar day.”
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