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Observations of Waves and Oscillations in the Solar Magnetic Fine Structure

Published online by Cambridge University Press:  12 April 2016

B. Fleck ,
F.-L. Deubner  and
W. Schmidt
B. Fleck
Affiliation:
Institut für Astronomie und Astrophysik der Universität Würzburg, Am Hubland, 8700 Würzburg, F.R. Germany
F.-L. Deubner
Affiliation:
Institut für Astronomie und Astrophysik der Universität Würzburg, Am Hubland, 8700 Würzburg, F.R. Germany
W. Schmidt
Affiliation:
Kiepenheuer-Institut für Sonnenphysik, Schöneckstraße 6, 7800 Freiburg, F.R. Germany

Abstract

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We study the oscillatory behaviour of small-scale magnetic flux-tube concentrations and their immediate surroundings by analysing high spatial resolution time series of spectra of four Zeeman sensitive lines (Fe I 5247.1, Cr I 5247.6, Fe I 5250.2, Fe I 5250.7) taken simultaneously in left-hand and right-hand circularly polarized light with the Echelle spectrograph at the Vacuum Tower Telescope in Izaña, Tenerife. The velocity field inside the magnetic elements is dominated by the 5-min oscillations which also show up as periodic variations in the relative amplitude asymmetry of the Stokes V profiles. In other parameters as for instance the Stokes V peak separation we cannot detect an oscillatory component. Neither the magnetic line ratio nor the thermal line ratio is affected by the 5-min oscillations, although the latter reveals remarkable spatiotemporal variations.

Type
Session 9. Convections and Oscillation in Active Regions
Information
International Astronomical Union Colloquium , Volume 141: The Magnetic and Velocity Fields of Solar Active Regions , 1993 , pp. 522 - 525
Copyright
Copyright © Astronomical Society of the Pacific 1993

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