A comparative study of the contrast of solar magnetic elements in CN and CH

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This article has an erratum: [erratum]

Issue		A&A Volume 437, Number 3, July III 2005


Page(s)		L43 - L46
Section		Letters
DOI		http://dx.doi.org/10.1051/0004-6361:200500135

A&A 437, L43-L46 (2005)
DOI: 10.1051/0004-6361:200500135

Letter

A comparative study of the contrast of solar magnetic elements in CN and CH

V. Zakharov¹, A. Gandorfer¹, S. K. Solanki¹ and M. Löfdahl²

¹ Max-Planck-Institut für Sonnensystemforschung, Max-Planck-Strasse 2, 37191 Katlenburg-Lindau, Germany
e-mail: [zakharov;solanki;gandorfer]@linmpi.mpg.de
² Institute for Solar Physics of the Royal Swedish Academy of Sciences, AlbaNova University Center, 106 91 Stockholm, Sweden
e-mail: mats@astro.su.se

(Received 17 March 2005 / Accepted 28 May 2005)

Abstract
Photospheric bright points were investigated in three different wavelength bands using interference filters centered at 436.5 nm (continuum), 430.5 nm (Fraunhofer's G-band dominated by absorption due to CH), and 388.7 nm (absorption band of CN). Such bright points serve as proxies of small-scale solar magnetic elements. Near diffraction limited imaging was achieved by real-time frame selection and subsequent joint phase diverse speckle reconstruction.

Comparison of the filtergrams of NOAA0670 taken in CH and CN shows that the contrast of bright points is on average 1.4 times higher in CN than in G-band, which is in good quantitative agreement with the predictions of Berdyugina et al. (2003, A&A, 412, 513) and Rutten et al. (2001, ASP Conf. Ser., 236, 445).

Key words: Sun: activity -- Sun: faculae, plages -- Sun: magnetic fields

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