I have written a small Android-Widget to easily have an eye on the current solar activity to be aware of possible GPS-Problems when there is a sun-storm. You can get it on Google-Play for free:

- https://play.google.com/store/apps/details?id=org.ligi.solar_activity_monitor

the code is on github:
- https://github.com/ligi/Solar-Activity-Monitor

Enjoy and have a safe flight!