Other
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd...3e...3h&link_type=abstract
Solar Active Regions and 3D Magnetic Structure, 26th meeting of the IAU, Joint Discussion 3, 16-17 August, 2006, Prague, Czech R
Other
Scientific paper
A decade of regular full-disk observations of the longitudinal Zeeman splitting of the chromospheric 854.2 nm CaII spectrum line reveals many interesting magnetic phenomena in the chromosphere. The most prominent is a large-scale, mainly horizontal diffuse field surrounding active regions. This extended canopy field is not present in the photosphere and is closely related to chromospheric fibrils and the circumfacule phenomenon. The properties of the field are described in this report. The atmosphere where this field is present has different dynamics, structure and radiative properties than other parts of the solar atmosphere and deserves more study. A method of measuring the longitudinal Zeeman splitting that accounts for the highly variable chromospheric line profile is also described.
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