Physics
Scientific paper
Oct 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008psa..book...39v&link_type=abstract
"Physics of the Sun and its Atmosphere, eds. B.N. Dwivedi and U. Narain, World Scientific, Singapore (ISBN 978-981-283-271-9), 2
Physics
Scientific paper
This chapter is basically divided into 2 parts. In the first part, the important properties of the solar magnetic field are summarized. The discussion begins with a simple introduction to solar magneto hydrodynamics. This introduction will be sufficient to understand the current status of the solar dynamo theory that follows. Some very curious and interesting results on force free fields are then presented in very basic terms. Finally, the application of this theoretical framework to the problems of coronal heating, solar flares and coronal mass ejections are developed in a simple unified scheme, based on a hierarchy of physical conditions. The second part consists of a tutorial on magnetographs. It begins with a description of polarization of light from very fundamental notions of coherence of light. This is followed by simple but comprehensive explanations of the Zeeman and Hanle effects along with the necessary basic ideas of quantum physics of scattering of light. Then the working of a few important magnetographs is outlined, with special emphasis on a solar vector magnetograph developed for USO, to provide a ''hands on" perspective. The article concludes with a few brief remarks on the possible future directions for research in the domain of solar magnetism...
Gosain Sanjay
Venkatakrishnan Parameshwaran
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