Abstract Intensities and profiles of ion emission lines between 1170 A and 1700 A from an active region on the Sun are measured from spectra obtained with the Naval Research Laboratory's High Resolution Telescope and Spectrograph - HRTS. The measurements provide simultaneous determination of line intensities, wavelength shifts and Doppler widths at 50 separate positions in the active region, with spatial resolution of 1 arc second and spectral resolution 0.07 A. Fine structure variation of intensities and gas flow velocities in the temperature range 20,000–200,000 K are determined. The density sensitive line pair I(1486 N IV)/I(1548 C IV) has been used to measure electron pressures. Derived emission measures imply filling factors of 0.05–0.1 to balance the divergence of conductive flux width radiative losses above 60,000 K.


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    Titel :

    The chromosphere-corona transition zone above an active region


    Beteiligte:
    Kjeldseth Moe, O. (Autor:in) / Andreassen, Ø. (Autor:in) / Maltby, P. (Autor:in) / Bartoe, J.-D.F. (Autor:in) / Brueckner, G.E. (Autor:in) / Nicolas, K.R. (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    1985-01-01


    Format / Umfang :

    4 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



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