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Reviews in Modern Astronomy pp 90–103Cite as

Time-Resolved Stokes V Polarimetry of Small-Scale Magnetic Structures on the Sun

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Part of the book series: Reviews in Modern Astronomy ((MOD.ASTRONOMY,volume 4))

Abstract

We address problems of the dynamics of small-scale magnetic fluxtube concentrations by analyzing high spatial resolution time series of spectra of selected lines taken simultaneously in left-hand and right-hand circularly polarized light. This approach is complementary to the one of the Zürich group. Our observations were obtained with the Vacuum Tower Telescope and the Echelle spectrograph at Izaña, Tenerife. The spectral range covered the lines of Fe 6302.5Å and Fe 6301.5Å. All parameters extracted from the Stokes V and Stokes I profiles (except the Stokes V line ratio) reveal significant spatio-temporal variations. The dominant oscillatory signal in the velocity data is due to the 5-min oscillations. Of special interest are the strong spatially and temporally varying differences between the (I+V) and (I−V) spectra in the magnetic structures. They cause large differences between the velocities deduced from the Stokes I profile and the Stokes V zero-crossing wavelength (up to 1 km/s), whereas their spatio-temporal averages are almost identical. We observe also an anticorrelation between the amplitude and asymmetry of the Stokes V profile.

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Author information

Authors and Affiliations

  1. Institut für Astronomie und Astrophysik, Am Hubland, W-8700, Würzburg, Fed. Rep. of Germany

    B. Fleck

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  1. B. Fleck
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Editors and Affiliations

  1. Landessternwarte, Königstuhl, W-6900, Heidelberg 1, Fed. Rep. of Germany

    Gerhard Klare

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© 1991 Springer-Verlag Berlin Heidelberg

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Fleck, B. (1991). Time-Resolved Stokes V Polarimetry of Small-Scale Magnetic Structures on the Sun. In: Klare, G. (eds) Reviews in Modern Astronomy. Reviews in Modern Astronomy, vol 4. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-76750-0_6

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  • DOI: https://doi.org/10.1007/978-3-642-76750-0_6

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-642-76752-4

  • Online ISBN: 978-3-642-76750-0

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