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 Vprofiles at high spatial resolution, show a fluctuation of υDoppler = 580 ms−1. This is substantially smaller than the “turbulent” broadening velocities of υDoppler = 2–3 kms−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.
Key words
This is a preview of subscription content, log in via an institution.
Buying options
Tax calculation will be finalised at checkout
Purchases are for personal use only
Learn about institutional subscriptionsPreview
Unable to display preview. Download preview PDF.
References
Amer, M.A., Kneer, F.: 1993, Astron. Astrophys. 273, 304
Beckers, J.M., Schröter, E.H.: 1968, Solar Phys. 4, 142
Denker, C., de Boer, C.R., Volkmer, R., Kneer, F.: 1995, Astron. Astrophys. 296, 567
Kneer F., von Uexküll, M.: 1991, Astron. Astrophys. 247, 556
Kneer, F., Hasan, S.S., Kalkofen, W.: 1995, Astron. Astrophys., in press
Rüedi, I., Solanki, S.Kĝ, Livingson, W., Stenflo, J.O.: 1992, Astron. Astrophys. 263, 323
Sheeley, N.R., Jr.: 1967, Solar Phys. 1, 171
Solanki, S.K.: 1993, Space Science Reviews 63, 1
Stenflo, J.O.: 1973, Solar Phys. 32, 41
Stenflo, J.O.: 1994, Solar Magnetic Fields — Polarized Radiation Diagnostics, Kluwer, Dordrecht
Volkmer, R., Kneer, F., Bendlin, C.: 1995, Astron. Astrophys. Letters, submitted
Wiehr, E.: 1978, Astron. Astrophys. 69, 279
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 1996 Kluwer Academic Publishers
About this paper
Cite this paper
Kneer, F., Stolpe, F. (1996). High Resolution Observations of Small-Scale Magnetic Elements and Interpretation. In: Stenflo, J.O., Nagendra, K.N. (eds) Solar Polarization. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-0231-2_24
Download citation
DOI: https://doi.org/10.1007/978-94-009-0231-2_24
Publisher Name: Springer, Dordrecht
Print ISBN: 978-94-010-6586-3
Online ISBN: 978-94-009-0231-2
eBook Packages: Springer Book Archive