A coronal mass ejection from an X-5 class flare that erupted on New Year's Eve, the strongest flare of solar cycle 25, will likely trigger geomagnetic storms when it hits Earth today (Jan. 2).

Coronal mass ejection from colossal New Year's Eve solar flare will strike Earth today

Source: space
Source Link: https://www.space.com/sun-solar-flare-new-years-eve-coronal-mass-eruption