which can provide some warning to satellite operators of hazardous conditions. These instruments are distinct from those used to detect large solar flares and CMEs.

  

11. These examples are drawn from the National Executive Committee for Space-Based Positioning, Navigation, and Timing, available at http://www.navcen.uscg.gov/gps/default.htm.

  

12. Dow, J.M., R.E. Neilan, and G. Gendt, The International GPS Service (IGS): Celebrating the 10th anniversary and looking to the next decade, Adv. Space Res. 36(3), 320-326, 2005, doi:10.1016/j.asr.2005.05.125.

  

13. Larson, K.M., P. Boudin, and J. Gomberg, Using 1-Hz GPS data to measure deformations caused by the Denali fault earthquake, Science 300, 1421, 2003, doi:10.1126/science.1084531.

  

14. Choi, K., A. Bilich, K. Larson, and P. Axelrad, Modified sidereal filtering: Implications for high-rate GPS positioning, Geophys. Res. Lett. 31, L22608, 2004, doi:10.1029/2004GL021621.

  

15. Bock, Y., L. Prawirodirdjo, and T. Melborne, Detection of arbitrarily large dynamic ground motion with a dense high-rate GPS network, Geophys. Res. Lett. 31, L06604, 2004, doi:10.1029/2003GL019150.



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