The Space Weather Prediction Center stated that severe geomagnetic storm occurred at 09:58 am EDT. Among the affects this kind of storm may have is "Navigation - Satellite navigation (GPS) degraded or inoperable for hours."
To see the full description go to http://www.swpc.noaa.gov/noaa-scales-explanation and click the item for "Geomagnetic Storms" then read the description for G3 Severe.
I have had fun this morning watching the alerts come in from K of 6 to 7 to 8. If it clears I hope to see some lights tonight. Big If.
I guess I'll find out tomorrow. My guys are collecting data sometime today.
What did you do this plot in?
That's why my trainee was having fits trying to get the RTK fix long enough to record the shot this morning:-S
Very nice site.