SIGNIFICANT SOLAR FLARE: Sunspot AR2644 erupted on April 1st, producing a significant M4-class solar flare. NASA’s Solar Dynamics Observatory recorded the explosion’s extreme UV flash:
UV radiation from the flare caused a brief shortwave radio blackout on the Pacific side of Earth: map. People who might have noticed the blackout include ham radio operators and mariners using low-frequency rigs for communication at frequencies below 10 MHz.
The explosion also hurled a coronal mass ejection (CME) into space: image. The cloud is not heading directly for Earth, but a glancing blow is possible in the days ahead. NOAA analysts are evaluating this possibility now.