CME impact! S4 solar radiation storm

Monday, 19 January 2026 20:41 UTC

Severe G4 geomagnetic storm conditions have been reached and aurora has been spotted from the Netherlands and Germany already. We do expect to reach Extreme G5 geomagnetic storm conditions based on the current data which means aurora might be seen from locations like France and even Italy in the hours ahead. The USA will also need to be on high alert if these conditions persist as aurora sightings might be possible from locations like Nevada, Utah and even Florida and Texas with a bit of luck!

S4 solar radiation storm

This event is already historic as we are currently in a severe S4 solar radiation storm. This is the first time since the famous 2003 Halloween event that we crossed the severe S4 threshold and the 3rd strongest radiation storm since measurements began. Do read our help article on solar radiation storms as S4 solar radiation storms do cause some issues for satellite operators and HF radio for example. We also can not use the real-time solar wind data from the ACE spacecraft (currently active) as it starts to have issues at the S2 level and higher. IMF parameters (Bt, Bz) are reliable so use these values instead but it is safe to say that the solar wind speed is well above 1.000km/s right now.

Do note that this false solar wind data means that the OVATION aurora map model is not accurate as it takes solar wind data to draw the oval on the map. ACE solar wind data might be reliable again at the S1 or S2 level.

We are also having issues with the Kp alerts and the Kp data on the website. We are working on a solution.

Don't forget to add your observations!