Eugen COCA wrote: > Other data available on this subject at: > > http://gps.ece.cornell.edu/spaceweather.html
Thanks for that pointer. I do wonder slightly about these results. They state: "The S4 index is quite high indicating the rapid variations of the signal power caused by the solar radio burst. The S4 index is NOT high because of ionospheric irregularities causing diffraction/refraction of the GPS signal." However, they seem to be measuring S/N, and elsewhere on that page they show that the noise alone increased greatly. So I don't quite see why they are saying the satellite output power was less, when the decreased S/N could simply have been due to increased noise (such as happens in spring and autumn with Ku-band domestic TV at 11GHz when the sun passes behind the satellite). Perhaps they are actually saying "noise varies", although they say "signal power varies". At least, that's the way I read it! Cheers, David _______________________________________________ questions mailing list [email protected] https://lists.ntp.isc.org/mailman/listinfo/questions
