Abstract This paper presents traveling ionospheric disturbances (TIDs) observations from GPS measurements over the South African region during the geomagnetically disturbed period of 29–31 October 2003. Two receiver arrays, which were along two distinct longitudinal sectors of about 18°-20° and 27°-28° were used in order to investigate the amplitude, periods and virtual propagation characteristics of the storm induced ionospheric disturbances. The study revealed a large sudden TEC increase on 28 October 2003, the day before the first of the two major storms studied here, that was recorded simultaneously by all the receivers used. This pre-storm enhancement was linked to an X-class solar flare, auroral/magnetospheric activities and vertical plasma drift, based on the behaviour of the geomagnetic storm and auroral indices as well as strong equatorial electrojet. Diurnal trends of the TEC and foF2 measurements revealed that the geomagnetic storm caused a negative ionospheric storm; these parameters were depleted between 29 and 31 October 2003. Large scale traveling ionospheric disturbances were observed on the days of the geomagnetic storms (29 and 31 October 2003), using line-of-sight vertical TEC (vTEC) measurements from individual satellites. Amplitude and dominant periods of these structures varied between 0.08–2.16 TECU, and 1.07–2.13h respectively. The wave structures were observed to propagate towards the equator with velocities between 587.04 and 1635.09m/s.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Traveling ionospheric disturbances observed at South African midlatitudes during the 29–31 October 2003 geomagnetically disturbed period


    Beteiligte:

    Erschienen in:

    Erscheinungsdatum :

    2013-10-17


    Format / Umfang :

    15 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch





    Spread-F during Quiet and Disturbed Periods at Midlatitudes

    Soicher, H. / Gorman, F. / Tsedilina, E. E. et al. | British Library Conference Proceedings | 1997



    Regional Properties of Traveling Ionospheric Disturbances Observed in Central China

    Wan, W. / Yuan, H. / Ning, B. et al. | British Library Conference Proceedings | 1999


    Empirical Modelling of Ionospheric Storms at Midlatitudes

    Muhtarov, P. / Kutiev, I. / International Council of Scientific Union; Committee on Space Research | British Library Conference Proceedings | 1998