Radiative properties of magnetic elements. I. Why are vec G-band bright points bright?

Details Radiative properties of magnetic elements. I. Why are vec G-band bright points bright? Radiative properties of magnetic elements. I. Why are vec G-band bright points bright?

Jun 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...372l..13s&link_type=abstract

Astronomy and Astrophysics, v.372, p.L13-L16 (2001)

Astronomy and Astrophysics

Astrophysics

39

Sun: Photosphere, Sun: Magnetic Fields, Sun: Faculae, Plages, Solar Irradiance Variability, G-Band

Scientific paper

Photospheric magnetic elements are most conspicuously visible in high-resolution G-band filtergrams. We show that their enhanced contrast in the G-band is due to a reduction of the CH abundance by dissociation in the deep photospheric layers of the flux tube, where it is hotter than in the surrounding atmosphere. As a consequence, the CH-lines weaken, allowing more of the continuum to ``shine'' through the forest of G-band CH-lines. We suggest that other molecular bands or atomic lines may exhibit a similar behaviour.

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