AbstractOne minute resolution Polar Cap (PC) index was used for the analysis of magnetospheric dynamics. The 1995–2000 time series analysis revealed that the power spectrum of the PC-index fluctuations is a power law in a wide range of frequencies. However, the obtained exponents differ for low and high frequency regions. The probability distribution functions of the PC-index fluctuations show a strong non-gaussian shape, depending on the time of increment. This indicates that the PC-index exhibits intermittency, previously detected in solar wind and auroral electrojet index fluctuations. The PC-index probability distribution functions were fitted by the functional form proposed by Castaing et al. [Velocity probability density functions of high Reynolds number turbulence. Physica D. 46, 177–200, 1990] to describe intermittency phenomena in ordinary turbulent fluid flows. The agreement between the fitting parameters obtained for the PC index and those reported before for solar wind magnetic field fluctuations is within 30%; which is noticeably less than the difference between the same parameters of solar wind and the AE-index fluctuations. This fact indicates that the PC index reflects the solar wind influence on the high-latitude magnetosphere, especially during the summer.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    PC-index fluctuations and intermittency of the magnetospheric dynamics


    Beteiligte:
    Stepanova, M. (Autor:in) / Antonova, E. (Autor:in) / Troshichev, O. (Autor:in)

    Erschienen in:

    Advances in Space Research ; 36 , 12 ; 2423-2427


    Erscheinungsdatum :

    2003-10-09


    Format / Umfang :

    5 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch





    Intermittency in the auroral absorption fluctuations as manifestation of magnetospheric turbulence

    Stepanova, M.V. / Antonova, E.E. / Foppiano, A.J. et al. | Elsevier | 2005



    Intermittency in the auroral absorption fluctuations as manifestation of magnetospheric turbulence

    Stepanova, M. V. / Antonova, E. E. / Foppiano, A. J. et al. | British Library Conference Proceedings | 2006


    Magnetospheric dynamics

    Mukai, T. / Lopez, R. / Maezawa, K. | Elsevier | 2005