On the Origin of Solar Faculae

Details On the Origin of Solar Faculae On the Origin of Solar Faculae

May 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004apj...607l..59k&link_type=abstract

The Astrophysical Journal, Volume 607, Issue 1, pp. L59-L62.

Astronomy and Astrophysics

Astronomy

83

Methods: Numerical, Magnetohydrodynamics: Mhd, Sun: Faculae, Plages, Sun: Magnetic Fields, Sun: Photosphere

Scientific paper

Solar faculae appear as bright small features close to the solar limb. Recent high-resolution images show these brightenings in unprecedented detail. Our analysis of numerical MHD simulations reproduces the observed small-scale features. The simulations reveal that faculae originate from a thin layer within granules just below largely transparent magnetic flux concentrations. This is basically the ``bright wall'' model of Spruit. The dark, narrow lanes often associated with faculae occur at the opposite side of the magnetic flux concentration and are due to an extended layer with lower-than-average temperature.

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