Observations with the High Resolution Telescope and Spectrograph (HRTS) of the C IV lines at 1550 A above sunspots reveal the coexistence of several distinct high velocity gas components within the instrument resolution element of 1 x 1 arcsec. A further investigation of the HRTS material demonstrates that such multiple gas velocities are not restricted to the temperature region around 100,000 K, where the C IV lines are formed, but that the gas flows with essentially unchanged speed through all temperature layers from 250,000 K to 10,000 K. Furthermore, the phenomenon is not restricted to sunspots, but occurs also in other solar regions, often most easily distinguished in active regions. The characteristics of the velocity fields are described. The mass fluxes are analyzed, and the requirements they place on the resolving power of future space instruments are discussed.


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    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)


    Erscheinungsdatum :

    1991-01-01



    Medientyp :

    Sonstige


    Format :

    Keine Angabe


    Sprache :

    Englisch


    Schlagwörter :


    Multiple flow velocities in the transition region

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    Transition Region Velocities and Line Profiles in the Sunspot Region 7981

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


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    Freier Zugriff

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


    Critical Velocities in Open Capillary Flow

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