Center-to-limb-variation of the G-band lines at 430.5 nm

Details Center-to-limb-variation of the G-band lines at 430.5 nm Center-to-limb-variation of the G-band lines at 430.5 nm

Jan 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002a%26a...382..312l&link_type=abstract

Astronomy and Astrophysics, v.382, p.312-318 (2002)

Astronomy and Astrophysics

Astrophysics

5

Sun: Atmosphere, Photosphere

Scientific paper

We measure the center-to-limb-variation of the CH lines in the wavelength range from 430.40 to 430.61 nm (G-band) for both quiet sun and for the cooler atmophere of sunspot umbrae at different heliographic positions. The limb effect of the CH lines is about 650 ms-1 at mu =0.1 with a slope similar to weak Fe lines. We investigate the behaviour of the CH abundance in the range of optical depth (tau =-0.05 to tau =-0.25) that is accessible by center-to-limb observations. The CH abundance decreases with height in accordance with recent numerical models.

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