Highlights CHAMP satellite and near-equatorial array SAMBA/MAGDAS observed simultaneous Pc3/Pi2 waves. Nighttime Pi2/Pc3 waves at low latitudes are produced by transmission of compressional mode to the ground. Observed amplitude-phase relationships are consistent with predictions of the thin ionosphere model.

    Abstract We have examined simultaneous ULF activity in the Pi2 and Pc3 bands at the near-equatorial magnetic stations in South America from SAMBA and MAGDAS arrays and low-orbiting CHAMP satellite during its passage over this meridional network. At the nighttime, both Pi2 and Pc3 waves in the upper ionosphere and on the ground are nearly of the same magnitude and in-phase. At the same time, the daytime Pc3 pulsations on the ground and in space are nearly out-of-phase. Comparison of observational results with the theoretical notions on the MHD wave interaction with the system ionosphere–atmosphere–ground suggests that nighttime low-latitude Pi2 and Pc3 wave signatures are produced by magnetospheric fast compressional mode. The daytime near-equatorial Pc3 waves still resist a quantative interpretation. These waves may be produced by a combination of two mechanisms: compressional mode leakage through the ionosphere, and by oscillatory ionospheric current spreading towards equatorial latitudes.


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    Titel :

    Near-equatorial Pi2 and Pc3 waves observed by CHAMP and on SAMBA/MAGDAS stations


    Beteiligte:
    Cuturrufo, F. (Autor:in) / Pilipenko, V. (Autor:in) / Heilig, B. (Autor:in) / Stepanova, M. (Autor:in) / Lühr, H. (Autor:in) / Vega, P. (Autor:in) / Yoshikawa, A. (Autor:in)

    Erschienen in:

    Advances in Space Research ; 55 , 4 ; 1180-1189


    Erscheinungsdatum :

    2014-11-12


    Format / Umfang :

    10 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch