I found the information below educational:
M-CLASS SUN RUPTION!
M CLASS SOLAR ERUPTION: Sunspot AR2816 erupted in the late hours of April 19 (2342 UT) producing a powerful M1 class solar flare. NASA's Solar Dynamics Observatory recorded the extreme ultraviolet flash. This is one of the most powerful eruptions of early solar cycle 25. A pulse of X-rays and ultraviolet radiation from the flare ionized the Earth's upper atmosphere, causing a shortwave radio blackout over the Pacific: Blackout Map. Navigators and radio amateurs in the area may have noticed unusual propagation conditions at frequencies below 10 MHz.
Chances are the explosion also hurled a Coronal Mass Ejector (CME) toward Earth. If so, he would likely arrive on April 22nd and 23rd. The jury has not yet decided. We will have to wait for more data from the SOHO coronagraph to confirm the CME. Stay tuned.
Source: https://www.spaceweather.com/
I got my email alert on this as it happened two days ago.
You can subscribe and get alerts via email at this site in Australia:
http://listserver.ips.gov.au/mailman/listinfo/ips-flare-alert
I usually get three alerts on each event: the start of the event, predicted end of the event, and the actual end of the event.
Here is what I got in the first alert:
"A Flare (Greater than C8 in X-ray Flux) Has Just Started At: 2341 UT on 19-04-2021"
This was in the second alert:
"Current X-ray Flux : 8.80e-06 (C8.8) Maximum X-ray Flux of 1.11e-05 (M1.1) at 23:42 UT Estimated Flare End (below M1.0 level) at 23:45 UT"
This was in the final alert:
"Approximate Flare Start : 19-04-2021 2339 UT Approximate Flare Maximum: 19-04-2021 2342 UT at Flux M 1.1 Approximate Flare End : 19-04-2021 2349 UT"
Everyone should subscribe. If a large X class event happens, you have a day or two to get your critical electronics disconnected and stored in Faraday cages. There will be some communications between shortwave operators who also protected their equipment. Also, you can use your computer locally. I have extra old computers packed away and backup hard drives packed away. I also have a solar panel setup packed up as well.