AbstractThis work studies the sudden increases in total electron content of the ionosphere caused by the very intense solar flare on July 14, 2000. Total electron content (TEC) data observed from a Global Positioning System (GPS) network are used to calculate the flare-induced TEC increment, δTECf, and variation rate, dTECf/dt. It is found that both dTECf/dt and δTECf are closely related with the solar zenith angles. To explain the observation results, we derived a simple relationship between the partial derivative of the flare-induced TEC, ∂TECf/∂t, which is a good approximation for dTECf/dt, and the solar zenith angle χ, as well as the effective flare radiation flux If, according to the well-known Chapman theory of ionization. The derived formula predicted that ∂TECf/∂t is proportional to If and inverse proportional to Chapman function ch(χ). This theoretical prediction not only explains the correlation of dTECf/dt and δTECf with χ as shown in our TEC observation, but also gives a way to deduce If from TEC observation of GPS network. Thus, the present work shows that GPS observation is a powerful tool in the observation and investigation of solar flare effects on the ionosphere, i.e., the sudden ionospheric disturbances, which is a significant phenomenon of space weather.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    The GPS measured SITEC caused by the very intense solar flare on July 14, 2000


    Beteiligte:
    Wan, Weixing (Autor:in) / Liu, Libo (Autor:in) / Yuan, Hong (Autor:in) / Ning, Baiqi (Autor:in) / Zhang, Shunrong (Autor:in)

    Erschienen in:

    Advances in Space Research ; 36 , 12 ; 2465-2469


    Erscheinungsdatum :

    2004-01-02


    Format / Umfang :

    5 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch





    Very energetic gamma-rays from the June 3, 1982 solar flare

    Forrest, D. J. / Vestrand, W. T. / Chupp, E. L. et al. | NTRS | 1986


    Solar flare precursors

    Van Hoven, G. / Hurford, G. J. | NTRS | 1986



    The Solar Flare Environment

    W. T. Roberts | NTIS | 1965