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On the relation between photospheric magnetic field and chromospheric emission in the quiet Sun

Published online by Cambridge University Press:  01 November 2008

Maria A. Loukitcheva ,
Sami K. Solanki  and
Stephen M. White
Maria A. Loukitcheva
Affiliation:
Astronomical Institute, St. Petersburg University, 198504 St. Petersburg, Russia email: marija@astro.spbu.ru Max-Planck-Institut für Sonnensystemforschung, D-37191 Katlenburg-Lindau, Germany
Sami K. Solanki
Affiliation:
Max-Planck-Institut für Sonnensystemforschung, D-37191 Katlenburg-Lindau, Germany
Stephen M. White
Affiliation:
Astronomy Department, University of Maryland, College Park, MD 20742
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Abstract

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In this contribution we present an observational study of the interaction of the photosphere with different chromospheric layers. We study the correlations between emissions at varying temperature from the temperature minimum region (UV continuum at 1600 Å from TRACE) through the low chromosphere (CaII K-line from BBSO) to the middle chromosphere (continuum at 3.5 mm from BIMA) and photospheric magnetic field from MDI/SOHO. For the first time millimeter observational data are included in such analysis.

We report a high degree of correlation between considered emissions formed at different heights in the chromosphere. A power law is found to be a good representation for the relationship between photospheric magnetic field and chromospheric emissions at all considered wavelengths. Our analysis shows that the dependence of chromospheric intensities on magnetic field is different for the network and internetwork regions. In the network a power law provides the best fit with the exponent being close to 0.5–0.6, while almost no dependence of chromospheric intensity on magnetic flux is found for the cell interiors. The obtained results support the idea of different heating mechanisms acting in the network (magnetic) and cell interiors (acoustic).

Keywords

Sun: magnetic fields – Sun: chromosphere – Sun: radio radiation – Sun: photosphere
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Symposium S259: Cosmic Magnetic Fields: From Planets, to Stars and Galaxies , November 2008 , pp. 185 - 190
Copyright
Copyright © International Astronomical Union 2009

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