[time-nuts] GPS tick all over the place. Suspect aurora effects

[Jim Lux]

On 1/26/12 2:08 PM, paul swed wrote:
> We are talking parts in the -9th but I am using a hp3801 and the general
> software that lets you see the 1 sec variation.
> I had never seen this behavior before and thought the oscillator must be in
> trouble. Measured it against a local RB and it was stable.
> Then it hit me, could this actually be the effects of the aurora?
> I am thinking it just might be.
> Regards
> Paul
> _

google for "Space Weather Effects on GPS"

there's a presentaton by Thomas Bogdan at the Space Weather Prediction 
Center that gives you some numbers to work with.

10s of meters effects aren't unusual.