The Kp Index measures geomagnetic disruption caused by solar activity around the world, on a scale from 0 (calm) to 9 (major storm).
The higher the Kp index, the more likely the drone is to have problems.
Kp of 0 - 4
Generally safe
Kp of 4 - 6
May experience minor GPS issues
Kp of 6 - 7
May lose a single satellite lock and may cause inaccurate location readings, radio/control interference possible
Kp of 7+
Unsafe. You may lose multiple satellite locks. Higher chance of inaccurate location readings, severe radio range impact, and onboard electronics interference