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Near-Limb Zeeman and Hanle Diagnostics

  • Coronal Magnetometry
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Abstract

“Weak” magnetic-field diagnostics in faint objects near the bright solar disk are discussed in terms of the level of non-object signatures, in particular, of the stray light in telescopes. Calculated dependencies of the stray light caused by diffraction at the 0.5-, 1.6-, and 4-meter entrance aperture are presented. The requirements for micro-roughness of refractive and reflective primary optics are compared. Several methods for reducing the stray light (the Lyot coronagraphic technique, multiple stages of apodizing in the focal and exit pupil planes, apodizing in the entrance aperture plane with a special mask), and reducing the random and systematic errors are noted. An acceptable level of stray light in telescopes is estimated for the V-profile recording with a signal-to-noise ratio greater than three. Prospects for the limb chromosphere magnetic measurements are indicated.

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Acknowledgements

This work was partially supported by research project No 11-02-00631 of the Russian Foundation for Basic Research. We are very indebted to the referee for corrections and important comments concerning the sources of stray light.

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Authors and Affiliations

  1. Sternberg Astronomical Institute, Moscow M.V. Lomonosov State University, Moscow, Russia

    I. S. Kim, I. V. Alexeeva, O. I. Bugaenko, V. V. Popov & E. Z. Suyunova

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  1. I. S. Kim
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  2. I. V. Alexeeva
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  3. O. I. Bugaenko
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  4. V. V. Popov
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  5. E. Z. Suyunova
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Correspondence to I. S. Kim.

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Coronal Magnetometry

Guest Editors: S. Tomczyk, J. Zhang, and T.S. Bastian

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Kim, I.S., Alexeeva, I.V., Bugaenko, O.I. et al. Near-Limb Zeeman and Hanle Diagnostics. Sol Phys 288, 651–661 (2013). https://doi.org/10.1007/s11207-013-0419-0

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  • DOI: https://doi.org/10.1007/s11207-013-0419-0

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