Short Wave Radio Blackout


Sunspots and Solar Flares

Space Weather and Radio 

There have been several reports that the AR2781 sunspot let off a C-class flare with a pulse of X-rays and UV radiation which ionized the top of Earth's atmosphere, causing a brief short wave radio blackout over Australia and the Indian Ocean.

Mariners, aviators, and ham radio operators in the region may have noticed unusual propagation at frequencies below 10 MHz.

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(Source: NASA, NOAA, ICQ Podcast, 22nd November 2020; Colin Butler)