Abstract A statistical study of the THEMIS FGM and ESA data is performed on turbulence of magnetic field and velocity for 218 selected 12min intervals in BBFs. The spectral index α in the frequency range of 0.005–0.06Hz are Gaussian distributions. The peaks indexes of total ion velocity Vi and parallel velocity V ‖ are 1.95 and 2.07 nearly the spectral index of intermittent low frequency turbulence with large amplitude. However, most probable α of perpendicular velocity V ⊥ is about 1.75. It is a little bigger than 5/3 of Kolmogorov (1941). The peak indexes of total magnetic field BT is 1.70 similar to V ⊥. Compression magnetic field B ‖ are 1.85 which is smaller than 2 and bigger than 5/3 of Kolmogorov (1941). The most probable spectral index of shear B ⊥ is about 1.44 which is close to 3/2 of Kraichnan (1965). Max V ⊥ have little effect on the power magnitude of VT and V ‖ but is positively correlated to spectral index of V ⊥. The spectral power of BT, B ‖ and B ⊥ increase with max perpendicular velocity but spectral indexes of them are negatively correlated to V ⊥. The spectral index and the spectral power of magnetic field over the frequency interval 0.005–0.06Hz is very different from that over 0.08–1Hz.


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    Titel :

    The distribution of spectral index of magnetic field and ion velocity in Pi2 frequency band in BBFs: THEMIS statistics


    Beteiligte:
    Wu, Q. (Autor:in) / Du, A.M. (Autor:in) / Volwerk, M. (Autor:in) / Wang, G.Q. (Autor:in)

    Erschienen in:

    Advances in Space Research ; 58 , 6 ; 847-855


    Erscheinungsdatum :

    2016-05-16


    Format / Umfang :

    9 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch






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