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    Centre-to-limb variation of photospheric facular radiance and image resolution

    Centre-to-limb variation of photospheric facular radiance and image resolution


    AbstractWe study the effect of the angular resolution on the determination of the angular properties of the facular radiance. We analyze photospheric intensity in the continuum, around the Ni 676.8nm line, and longitudinal magnetic field along the line of sight, measured by the MDI instrument aboard SOHO with two spatial resolutions, 4″ and 1.2″ (2″ and 0.6″ pixels, respectively). The effect of the limited photometric sensitivity of the instrument and the limited information on the angular structure of the magnetic field tubes are considered. Our study of the high-resolution data shows that intensity contrast of magnetic features between 80 and 600 Gauss increases from centre to limb up to a maximum that occurs at higher heliocentric angles (θ) when obtained with higher resolution data than for lower resolution data. There is a suggestion that at heliocentric angles below about 75° there is only a monotonic increase in the contrast as one goes from cos(θ)=1 to cos(θ)=0.2.

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    Titel :

    Centre-to-limb variation of photospheric facular radiance and image resolution

    Beteiligte:
    Domingo, Vicente (Autor:in) / Ortiz, Ada (Autor:in) / Sanahuja, Blai (Autor:in) / Cabello, Iballa (Autor:in)
    Erschienen in:

    Advances in Space Research ; 35 , 3 ; 345-349

    Erscheinungsdatum :

    2005-01-17

    Format / Umfang :

    5 pages

    ISSN :

    0273-1177

    DOI :

    https://doi.org/10.1016/j.asr.2005.01.083

    Medientyp :

    Aufsatz (Zeitschrift)

    Format :

    Elektronische Ressource

    Sprache :

    Englisch

    Schlagwörter :

    Solar irradiance , Solar photosphere magnetism , Solar atmosphere , Network , Faculae

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