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Plasma Motions around Sunspots

Published online by Cambridge University Press:  12 April 2016

G. Lustig  and
H. Wöhl
G. Lustig
Affiliation:
Institut für Astronomie, Karl-Franzens-UniversitätA-8010 Graz, Austria
H. Wöhl
Affiliation:
Kiepenheuer-Institut für Sonnenphysik D-W7800 Freiburg, Germany

Abstract

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Motions of large, stable sunspots – which are in some cases even recurrent – are determined using the Vacuum Tower Telescope (VTT) at Tenerife and sunspot drawings taken at the Kanzelhöhe Observatory in Austria. Around the sunspots fields of about 100 by 100 arcseconds are covered by a scanning spectrograph entrance slit in steps of one arcsecond every 15 seconds to determine the plasma velocities. The main aim is a determination of plasma and sunspot velocities within larger fields of activity and a search for special patterns of plasma flows, which reflect the well-known braking of the sunspot rotation velocity during aging.

Type
Session 1. Structure of Active Regions
Information
International Astronomical Union Colloquium , Volume 141: The Magnetic and Velocity Fields of Solar Active Regions , 1993 , pp. 40 - 43
Copyright
Copyright © Astronomical Society of the Pacific 1993

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