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distribution with smaller scales than the model background. Travelling Ionospheric Disturbances (TIDs) produce
three dimensional and time dependent disturbances of the background ionization. We present a TID model
suitable to «modulate» large scale electron density distributions by multiplication. A model TID takes into account
the forward tilt of the disturbance wave front, a distinct vertical structure, a fan type horizontal radiation
characteristic, geometric dilution and attenuation. More complicated radiation patterns can be constructed by
means of superposition. The model TIDs originate from source regions which can be chosen arbitrarily. We show
examples for TID modulations of the background model family developed at Trieste and Graz (NeQuick, COSTprof
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