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. Physical and chemical processes in the ionosphere are driven bycomplex interactions with the solar radiation. The ionospheric plasma is inparticular sensitive to solar EUV and UV variations with a time delay betweenone and two days. This delay is assumed to be related to thermospherictransport processes from the lower ionosphere to the F region. In previousanalyses, the delay has been investigated using the F10.7 index. Here wepresent preliminary results of the ionospheric delay based on a comprehensiveand reliable database consisting of GNSS TEC Maps and EUV spectral flux data.We plan to specify the various dependencies from geographic/geomagneticlocation, altitude, season, local time, geophysical and solar radiationconditions such as the solar activity level. The first results fordependencies from seasons and wavelengths regions of the EUV are presented inthis paper. These results can provide more insight into ionospheric processesand are of interest for applications dependent on reliable ionosphericweather forecasts, e.g. GNSS error analyses, prediction and mitigation.

Delayed response of the ionosphere to solar EUV variability