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Siphon Flow Across the Magnetic Neutral-Line of an Active Region

Published online by Cambridge University Press:  12 April 2016

S.K. Solanki ,
I. Rüedi  and
D. Rabin
I. Rüedi
Affiliation:
Institute of Astronomy, ETH-Zentrum, CH-8092 Zürich, Switzerland
D. Rabin
Affiliation:
National Solar Observatory, NOAO*, P.O. Box 26732, Tucson, AZ 85726, USA

Abstract

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We present accurate measurements, based on the g = 3 line at 1.5648/µm, of the field strength and longitudinal velocity in the vicinity of the magnetic neutral-line of a solar active region. We find that very close to the neutral line the field strength and the flow velocity are correlated in the sense that the magnetic polarity with the larger field strength is associated with a downflow, while the polarity with the weaker field shows an upflow. This is exactly the signal predicted by theoretical models of siphon flows, and constitutes the first reliable detection of a siphon flow on the sun.

Keywords

Solar magnetic fieldsactive regionssiphon flowsinfrared polarimetry
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. 534 - 537
Copyright
Copyright © Astronomical Society of the Pacific 1993

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