The presence of a solar active region affects the luminosity of the sun. Sunspots directly produce 'dips' in the total solar irradiance approximately proportionally to their projected area, while faculae produce excess energy. These effects were discovered during the solar maximum period of 1980, and the sunspot effect during solar minimum is examined. The 'dip' due to an active region in April, 1985, as observed in the total solar irradiance by the ACRIM instrument on the Solar Maximum Mission is examined. These data (obtained after the spacecraft repair in May, 1984) have simple variations, relative to those observed in 1980, because of the reduced level of activity approaching solar minimum. It is found that the PSI index of projected sunspot area as defined in 1980 appears to describe this 'dip' satisfactorily.


    Zugriff

    Zugriff über TIB

    Verfügbarkeit in meiner Bibliothek prüfen


    Exportieren, teilen und zitieren



    Titel :

    Energy balance in solar active regions - The dip of April, 1985


    Beteiligte:
    Hudson, H. S. (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    1986-01-01



    Medientyp :

    Sonstige


    Format :

    Keine Angabe


    Sprache :

    Englisch


    Schlagwörter :



    Abundance variations in solar active regions

    Strong, K.T. / Lemen, J.R. / Linford, G.A. | Elsevier | 1991


    Magnetic Fields in Solar Active Regions

    Mclntosh, Patrick S. / Dryer, Murray | AIAA | 1972


    Abundance variations in solar active regions

    Strong, K. T. / Lemen, J. R. / Linford, G. A. | NTRS | 1991


    A New Perspective on Solar Active Regions

    Strong, K.T. | Online Contents | 1995