Vector magnetic fields in prominences |
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| Authors: | Charles W Querfeld Raymond N Smartt Veronique Bommier Egidio Landi Degl'innocenti Lewis L House |
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| Institution: | (1) High Altitude Observatory, National Center for Atmospheric Research, 80307 Boulder, CO, USA;(2) National Solar Observatory, 88349 Sunspot, NM, USA;(3) Observatoire de Paris-Meudon, 92190 Meudon, France;(4) Istituto di Astronomia, Universitá di Firenze, Largo E. Fermi, 5, 50125 Firenze, Italy;(5) High Altitude Observatory, National Center for Atmospheric Research, 80307 Boulder, CO, USA |
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| Abstract: | The Stokes components of He i D3 emission in two quiescent prominences, using full spectral profile measurements, are analyzed to derive vector magnetic fields. Two independently developed schemes, based on the Hanle effect, are used for interpretation. They involve solutions of the statistical equilibrium equations for the He i D3 multiplet, including the effect of coherency and full level crossing, which predict the magnetic field dependence of the observed polarization. Derived magnetic field vector solutions for each pair of linear polarization Stokes profiles corresponding to an observational point in the prominence are, intrinsically, not uniquely determined, and a set of possible solutions is usually obtained. However, mutual consistency of these solutions with those independently predicted by the form of the circular polarized component, allow, in almost all cases, rejection of all solutions of a set except one symmetrical pair. Of such a pair, a unique solution can be determined with a high confidence level by reference to independent potential field information. Field vectors are found usually to be close to horizontal and normal to the prominence surface, but extreme exceptions are found. Field values range from 6 G to 60 G. The derived vectorfield configurations and their magnitudes are briefly discussed relative to these prominences and to different quiescent prominence models.The National Center for Atmospheric Research is sponsored by the National Science Foundation.Operated by the Association of Universities for Research in Astronomy, Inc. under contract with the National Science Foundation. |
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