This may be of interest if your are flying...

Rare solar flare caused radiation in Earth's atmosphere to spike to highest levels in nearly 20 years

https://www.space.com/astronomy/sun/rare-solar-flare-caused-radiation-in-earths-atmosphere-to-spike-to-highest-levels-in-nearly-20-years-researchers-say?utm_term=8B32651A-3A05-4BA0-8F3D-B73E942A9857&lrh=5b7a2aaab899389ac4d318a9ebd8d85ae58f95de3ae7df6dcfc95344a88d6817&utm_campaign=58E4DE65-C57F-4CD3-9A5A-609994E2C5A9&utm_medium=email&utm_content=3B1D3FF0-D540-4068-A77E-F910A9946C93&utm_source=SmartBrief

Back in the 1970's I was flying the 747 on polar flights from London to LAX.  Our route of flight would be close to high 70's and sometimes at 80 degrees of latitude.  One time while we were flying at a high latitude we got a call from dispatch telling us that a strong solar flare had occurred and the we must descend in altitude and head south to a lower latitude to avoid strong radiation.  As an astronomer, I knew this could be a real problem so we wasted no time requesting to head south with ATC.  Look what just happened to the Airbus A-320 fleet.  I've been watching the sun for many decades and it seems that these flares are stronger and happening more often. Now these flares don't travel at the speed of light, but still they move very fast so be careful.

Enjoy your flying!
Lou 8-)