Abstract Different processes involving the magnetic field and its fine structures in the atmosphere have been proposed to explain the heating of the corona. To help explore phenomena related to these different processes, we will report some new observations of oscillations in fine chromospheric structures using the MSDP spectrograph operating at Meudon and the UVSP spectrograph aboard SMM. The temporal analysis of radial velocities measured in the C IV line shows that no oscillations are detectable in the transition zone. It is in good agreement with the wave reflection model generally admitted. In the Hα line the 2 D analysis points out that the energy observed in an unresolved frequency range around 250 s in the chromospheric power spectrum is in fact concentrated in structures parallel to chromospheric fibrils along which the phase extends coherently. The oscillations appear to be transverse and might be interpreted either by Alfv́en waves generated in the chromosphere and propagating through magnetic filamentary structures or by eigenmodes of filamentary structures excited by chromospheric p-modes.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Oscillations detected in C IV and Hα lines in magnetic structures


    Beteiligte:
    Schmieder, B. (Autor:in) / Thompson, W.T. (Autor:in) / Mein, P. (Autor:in)

    Erschienen in:

    Advances in Space Research ; 11 , 4 ; 195-198


    Erscheinungsdatum :

    01.01.1991


    Format / Umfang :

    4 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



    Intensity Oscillations in NaI D1 and D2 Lines

    Kariyappa, R. / Pap, J. M. | British Library Online Contents | 1995


    MATCHING LINES OF POINTS FROM VEHICLE LIDAR TO VISION DETECTED OBJECTS

    BOUBLIL DAVID / COHEN-ZEMACH AMITTAI ELIA / STEINBERG ROY et al. | Europäisches Patentamt | 2025

    Freier Zugriff


    Chaotic Oscillations of Structures in Mechanical Engineering

    Nagai, K.-I. / Yamaguchi, T. | British Library Online Contents | 1998