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  • Author or Editor: R. Leitinger x
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GPS data from a dense network of receivers can be an important source of information on Travelling Ionospheric Disturbances (TIDs), especially for smaller scale fluctuations (small and medium scale TIDs). Since absolute TEC ``calibration'' is not necessary it is sufficient to work with GPS differential phase data. We are using data from a dense network of GPS receivers distributed over Austria to assess TID activities on a bi-hourly basis. The raw data are stored in the well-known RINEX format. The phase differences are extracted and after correction of ``cycle slips'' the data are subjected to band-pass filtering. Cycle slip correction is a tricky but necessary process. The use of ``cycle slip free'' time intervals would leave only a fraction of available data for TID activity assessment. We describe the data retrieval and preparation system and show first results (case studies and preliminary results).

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A complete three dimensional formulation for the main trough has been constructed on the basis of Dynamic Explorer (DE) data. The model uses the trough minimum model published by Werner and Pr\"olss (which is also based on DE data) and a time dependent shape of the trough.  The shape parameters \begin{itemize} \item depth of the trough, \item equatorward half-width, \item poleward half-width, \item steepness of the equatorward wall, \item steepness of the poleward wall \end{itemize} have been derived from Dynamic Explorer electron densities gained in the height region below 700 km and scaled to the F2 layer peak by means of the COSTprof model. Our trough model uses the medians of the shape parameters for three seasons (winter, equinox, summer) and two magnetic local time intervals (“day“ and “night“).

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