Tom Van Baak said the following on 01/26/2012 08:24 PM:
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.
There's a wonderful example of GPS timing and space weather in a
paper by fellow time-nuts Rick Hambly and Tom Clark.
Rick was calibrating a set of Motorola Oncore receivers at USNO and
happened to capture the massively disrupting effect of a rare Aurora
on September 7, 2002.
There's a mention of this in his paper:
http://www.gpstime.com/files/PTTI/PTTI_2002_CNS_Testbed.pdf
But the best part are the sky photos and plots on page 17 and 18 here:
http://www.gpstime.com/files/PTTI/PTTI_2002_CNS_Testbed_VG.ppt
Not nearly as pretty, but I caught a major flare in 2006 in some GPS
signal strength data that I was recording at the time:
http://febo.com/pages/gps_solar_flare/index.html
John
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