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Strong and Weak Magnetic Fields: Nature of the Small-Scale Flux Elements

Published online by Cambridge University Press:  12 April 2016

Jan Olof Stenflo
Jan Olof Stenflo*
Affiliation:
Institute of Astronomy, ETH-Zentrum, CH-8092 Zurich, Switzerland

Abstract

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The 20 year old conclusion that more than 90% of the magnetic flux recorded by magnetographs in quiet and active regions is in strong-field, kG form has recently been supported by direct observations of Zeeman splitting in the infrared (near 1.6 μm). The magnetic and thermodynamic properties of the kG fluxtubes have been explored in considerable detail over the past decade, in particular through Fourier transform spectrometer observations combined with Stokes inversion procedures. The weak fields have proven to be much more elusive, and it was not until last year that the first definite identifications of intrinsically weak (less than kG) fields in the low photosphere could be made, using the Stokes V profiles of an infrared line pair.

Type
Session 4. Friendly Debate: The Relation of Quiet Sun to Active Regions
Information
International Astronomical Union Colloquium , Volume 141: The Magnetic and Velocity Fields of Solar Active Regions , 1993 , pp. 205 - 214
Copyright
Copyright © Astronomical Society of the Pacific 1993

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