Abstract Observations with the High Resolution Telescope and Spectrograph (HRTS) of the C IV lines at 1550 Å above sunspots reveal the co-existence of several distinct high velocity gas components within the instrument resolution element of 1 × 1 arc second. A further investigation of the HRTS material demonstrates that such multiple gas velocities are not restricted to the temperature region around 105 K, where the C IV lines are formed, but that the gas flows with essentially unchanged speed through all temperature layers from 2.5 × 105 K to 104 K. Furthermore the phenomenon is not restricted to sunspots, but occurs also in other solar regions, often most easily distinguished in active regions. We describe the characteristics of the velocity fields, analyze the mass fluxes and discuss the requirements they place on the resolving power of future space instruments.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Multiple flow velocities in the transition region


    Beteiligte:
    Brekke, P. (Autor:in) / Brynildsen, N. (Autor:in) / Kjeldseth-Moe, O. (Autor:in) / Maltby, P. (Autor:in) / Bartoe, J.-D.F. (Autor:in) / Brueckner, G.E. (Autor:in)

    Erschienen in:

    Advances in Space Research ; 11 , 5 ; 251-254


    Erscheinungsdatum :

    01.01.1991


    Format / Umfang :

    4 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



    Multiple flow velocities in the transition region

    Brekke, P. / Brynildsen, N. / Kjeldseth-Moe, O. et al. | NTRS | 1991


    Transition Region Velocities and Line Profiles in the Sunspot Region 7981

    Brynildsen, N. et al. | British Library Online Contents | 1997


    Flow velocities and streamlines

    Katsanis, T. / Mcnally, W. D. | NTRS | 1978


    DIFFERENTIAL ASSEMBLY WITH MULTIPLE VELOCITIES

    PEREIRA DE LEMOS JOSÉ FRANCIVALDO | Europäisches Patentamt | 2023

    Freier Zugriff

    Critical Velocities in Open Capillary Flow

    Rosendahl, U. / European Space Agency / Centre National d'Etudes Spatiales | British Library Conference Proceedings | 2001