Controlling current conditions of navigation sattelites’ signal propagation

We suggest using the S 4 scintillation index to control the current radiowave propagation condition and radio navigation parameter measurement quality by signals from individual GPS satellites. We corroborate the possibility to use the S 4 index for the above purposes by example of simultaneous observations of navigation-temporal positioning errors via applyng user's GPS/ GLONASS МРК-19Л navigation equipment and current geomagnetic conditions during the 2004 November 9 powerful magnetic storm.