Solar active regions - Radiative intensities and large-scale parameters of the magnetic field

Details Solar active regions - Radiative intensities and large-scale parameters of the magnetic field Solar active regions - Radiative intensities and large-scale parameters of the magnetic field

Jun 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...180..241s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 180, no. 1-2, June 1987, p. 241-252.

Astronomy and Astrophysics

Astrophysics

59

Magnetic Flux, Radiant Flux Density, Solar Activity, Solar Magnetic Field, Magnetic Signatures, Plasma Heating, Spectroheliographs, Sunspots, Ultraviolet Spectra

Scientific paper

Tight relations are established here between parameters characterizing the large-scale properties of solar active regions. The averaged magnetic flux density appears nearly constant at 100 + or - 20 G. Hence, with a typical mean flux density of 1-2 kG in photospheric flux tubes, the filling factor for the photospheric magnetic field in active regions lies between 5 and 10 percent. The total intensity of active regions in the chromospheric C II or in the coronal Mg X line is tightly related with the total magnetic flux in the active region. A model is presented to explain the relations between the projected surface areas of active regions as determined from magnetograms and from spectroheliograms at different wavelengths. The total coronal heating depends nearly linearly on the total magnetic flux in the active region or on the area of the magnetic plage. The mean magnetic flux density in quiet regions suggests a linear dependence of the coronal heating on the mean magnetic flux density in active and quiet regions.

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