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A Study of Direct Severe Space Weather Effects On GPS Ionospheric Delay

Here one study of svere space weather conditions and its consequences on the GPS ionospheric delay in Croatia is presented.The study takes advantage of the availability of the space weather indices and the GPS pseudorange measurements (taken at the reference site at Osijek , Croatia ) related to a major severe space weather event lasting form early October 2003 to late November 2003.This paper presents the reconstruction of the severe space weather conditions and the development of ionospheric disturbances.Based on these reconstructions , the dynamics of the GPS ionospheric delay has been derived.The comparision of actual (measured) and modelled (according to standard GPS model) GPS ionospheric delay has been performed , with the aims od identifying actual behaviour of GPS ionospheric delay and examining the ability of standard (Klobuchar) GPS model to describe the GPS ionospheric delay in severe space weather conditions.Two interesting experimental models derived from the data analysis are presented , addressing the direct relations between the GPS ionospheric delay and the parameters of space weather activity (sunspot number and solar flux) , as observed at the reference station Osijek , Croatia.The paper concludes with the plans for further research activitieas related to the regional GPS ionospheric delay model development for south-eastern Europe.

space weather; GPS; ionospheric delay; mathematical model

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