High resolution observations of small-scale magnetic elements and interpretation |
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| Authors: | F Kneer F Stolpe |
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| Institution: | (1) Universitäts-Sternwarte, Geismarlandstr. 11, D-37083 Göttingen, Germany |
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| Abstract: | This contribution deals with the properties of small-scale magnetic elements in plages. Spectro-polarimetric observations, obtained with the highest possible spatial resolution with the German solar telescopes at the Observatorio del Teide on Tenerife, were analysed. We conclude from the spread of line parameters measured in the Stokes I and V profiles of Fe I and Fe II lines that a wide range of magnetic properties is realised in the solar atmosphere. The flow velocities in small-scale magnetic flux tubes, deduced from the zero-crossing of the V profiles at high spatial resolution, show a fluctuation of v
Doppler = 580 m s-1. This is substantially smaller than the  turbulent broadening velocities of v
Doppler = 2 – 3 km s–1 commonly derived by fitting V profiles from flux tube models to low spatial resolution data, e.g. from a Fourier Transform Spectrometer. Attempts to explain the high resolution I and V profiles by models of hydrostatic flux tubes are discussed. It appears impossible to accomplish agreement between the modeled and observed radiation of lines with strong and weak magnetic sensitivity at the same time. We suggest a scenario in which small-scale magnetic elements possess substructure and are dynamic, with gas flows and magnetic field strengths varying in space and time. |
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| Keywords: | Small scale magnetic fields High spatial resolution observation Dynamic properties |
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