In long distance rf communication, radio waves are bounced (sometimes several times) off different regions in the ionosphere (https://www.electronics-notes.com/

In long distance rf communication, radio waves are bounced (sometimes several times) off different regions in the ionosphere (https://www.electronics-notes.com/articles/antennas-propagation/ionospheric/hf-propagation-basics.php https://www.electronics-notes.com/articles/antennas-propagat...). Since the waves caused by the eruption apparently reached the ionosphere, (some) radio bands may be affected.