As per SpaceWeather
Today, the sun unleashed one of the biggest solar flares in years, a X3.4-class explosion from behind the sun’s southwestern limb. Solar protons energized by the flare are now raining down on Earth’s atmosphere, causing polar shortwave radio blackouts and other effects. The intensifying radiation storm could last for days.

Ground
Breathe
Lots of water
Gentle stretching
Eating foods as recognizable as possible
Modified sun salutations several times a day
Be patient with yourself… And others
Be extra careful driving