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FIP bias in a sigmoidal active region

Published online by Cambridge University Press:  06 January 2014

D. Baker ,
D. H. Brooks ,
P. Démoulin ,
Lidia van Driel-Gesztelyi ,
L. M. Green ,
K. Steed  and
J. Carlyle
D. Baker
Affiliation:
University College London, Mullard Space Science Laboratory, Holmbury St Mary, Dorking, Surrey, RH5 6NT, UK email: deborah.baker@ucl.ac.uk
D. H. Brooks
Affiliation:
College of Science, George Mason University, 4400 University Drive, Fairfax, VA 22030, U.S.A.
P. Démoulin
Affiliation:
LESIA, Observatoire de Paris, CNRS, UPMC Université Paris-Diderot, 92195, Meudon, France
Lidia van Driel-Gesztelyi
Affiliation:
University College London, Mullard Space Science Laboratory, Holmbury St Mary, Dorking, Surrey, RH5 6NT, UK email: deborah.baker@ucl.ac.uk LESIA, Observatoire de Paris, CNRS, UPMC Université Paris-Diderot, 92195, Meudon, France Konkoly Observatory, Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences, PO Box 67, 1525, Budapest, Hungary
L. M. Green
Affiliation:
University College London, Mullard Space Science Laboratory, Holmbury St Mary, Dorking, Surrey, RH5 6NT, UK email: deborah.baker@ucl.ac.uk
K. Steed
Affiliation:
Centre for Mathematical Plasma Astrophysics, KU Leuven, Celestijnenlaan 200B, 3001 Leuven, Belgium
J. Carlyle
Affiliation:
University College London, Mullard Space Science Laboratory, Holmbury St Mary, Dorking, Surrey, RH5 6NT, UK email: deborah.baker@ucl.ac.uk
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Abstract

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We investigate first ionization potential (FIP) bias levels in an anemone active region (AR) - coronal hole (CH) complex using an abundance map derived from Hinode/EIS spectra. The detailed, spatially resolved abundance map has a large field of view covering 359″ × 485″. Plasma with high FIP bias, or coronal abundances, is concentrated at the footpoints of the AR loops whereas the surrounding CH has a low FIP bias, ~1, i.e. photospheric abundances. A channel of low FIP bias is located along the AR's main polarity inversion line containing a filament where ongoing flux cancellation is observed, indicating a bald patch magnetic topology characteristic of a sigmoid/flux rope configuration.

Keywords

Sun: abundancesSun: active regionSun: coronal holesolar wind
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S300: Nature of Prominences and their role in Space Weather , June 2013 , pp. 222 - 226
Copyright
Copyright © International Astronomical Union 2013 

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