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  • 1 Institut für Geophysik, Astrophysik und Meteorologie (IGAM), Universität Graz A-8010 Graz, Austria
  • 2 Institut für Geophysik, Astrophysik und Meteorologie (IGAM), Universität Graz A-8010 Graz, Austria
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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).

  • Hofmann-Wellenhof B, Lichtenegger H, Collins J 1994: GPS. Theory and practice. Springer Wien and New York, 3rd ed., ISBN 3-211-82591-6

    Theory and practice , ().

  • Georges T M, Hooke W H 1970: J. Geophys. Res., 75, 6295-6308.

    () 75 J. Geophys. Res. : 6295 -6308.

  • Gossard E E, Hooke W H 1975: Waves in the atmosphere. Atmospheric infrasound and gravity waves. Their generation and propagation. (Developments in Atmospheric Science 2). Elsevier, Amsterdam-New York

    Waves in the atmosphere , ().

  • Gurtner W 1998: RINEX. The Receiver Independent Exchange Format Version 2. Report, Astronomical Institute, University of Bern, Switzerland, last rev. 1998. Available by

  • Hines C O 1959: J. Geophys. Res., 64, 2210-2211.

    () 64 J. Geophys. Res. : 2210 -2211.

  • Hines C O 1960: Can. J. Phys., 39, 1441-1481.

    () 39 Can. J. Phys. : 1441 -1481.

  • Yeh K C, Liu C H 1974: Rev. Geophys. Space Phys., 12, 193-216.

    () 12 Rev. Geophys. Space Phys. : 193 -216.

  • Prölss G 2001: Physik des erdnahen Weltraums. Springer, Berlin etc., ISBN 3-540-42052-5

    Physik des erdnahen Weltraums , ().

  • Koekkoek H S 1997: Excitation mechanisms of medium scale travelling ionospheric disturbances. Ph.D. Thesis Eindhoven University of Technology, ISBN 90-386-0537-4

  • Neustrelitz TEC Web Site:

  • van Velthoven P F J 1990: Medium scale irregularities in the ionospheric electron content. Ph.D. Thesis Eindhoven University of Technology

  • Jakowski N 1998: In: Proc. 2nd COST251 Workshop, A Vernon ed., 51-57.

    , , .

  • Kirchengast G 1996: J. Geophys. Res., 101, 13353-13368.

    () 101 J. Geophys. Res. : 13353 -13368.