AbstractWe have recently observed thirteen sunspots, both with CDS on SOHO and TRACE. For each sunspot we investigate the oscillations in the chromosphere, transition region and corona. Above the umbra the power spectra show one dominant peak corresponding to a period of 3 minutes. The intensity oscillation amplitude increases with increasing temperature, reaches a maximum for lines emitting close to 1–2 × 105 K, and decreases for higher temperatures. Part of the wave energy penetrates into the corona, channeled into small areas that appear to coincide with the endpoints of sunspot coronal loops. The observations support the hypothesis that the oscillations are caused by upwardly propagating acoustic waves and show no signs of the resonances, equally spaced ≈1 mHz in frequency, predicted by the chromospheric resonator theories.


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    Titel :

    Search for a chromospheric resonator above sunspots


    Beteiligte:
    Brynildsen, N. (Autor:in) / Maltby, P. (Autor:in) / Brekke, P. (Autor:in) / Redvik, T. (Autor:in) / Kjeldseth-Moe, O. (Autor:in)

    Erschienen in:

    Advances in Space Research ; 32 , 6 ; 1097-1102


    Erscheinungsdatum :

    2003-01-15


    Format / Umfang :

    6 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



    Search for a chromospheric resonator above sunspots

    Brynildsen, N. | Online Contents | 2003


    Search for a Chromospheric Resonator Above Sunspots

    Brynildsen, N. / Maltby, P. / Brekke, P. et al. | British Library Conference Proceedings | 2003


    Observations of Oscillations above Sunspots

    Rendtel, J. / Staude, J. / European Space Agency | British Library Conference Proceedings | 2001


    The Transition Region Above Sunspots

    Curdt, W. / Landi, E. / European Space Agency | British Library Conference Proceedings | 2006