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Hemispheric Patterns in Filament Chirality and Sigmoid Shape over the Solar Cycle

Published online by Cambridge University Press:  06 January 2014

Petrus C. Martens ,
Anthony R. Yeates  and
Karthik G. Pillai
Petrus C. Martens
Affiliation:
Physics Department, Montana State University, Bozeman, MT 59717, USA, email: [email protected]
Anthony R. Yeates
Affiliation:
Department of Mathematical Sciences, Durham University, Science Laboratories, South Road, Durham DH1 3LE, UK, email: [email protected]
Karthik G. Pillai
Affiliation:
Computer Science Department, Montana State University, Bozeman, MT 59717, USA, email: [email protected]
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Abstract

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The motivation for our research was to study the correlation between the chirality of filaments and the handedness (S- or Z-shape) of sigmoids. It was assumed that sigmoids would mostly coincide with filaments and that the S-shaped sigmoids would correlate well with filaments of sinistral chirality, which we found that to be at best a very weak relation. Since we had a full solar cycle of filament metadata at hand it was easy to verify the supposedly known hemispheric preference of filament chirality. We discovered that the hemispheric chirality rule was confirmed for the epoch where a thorough manual study had been performed, but that at other phases of the solar cycle the rule seems to disappear and sometimes even reverse.

Keywords

Solar FilamentsSolar SigmoidsHemispheric Chirality Rule
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. 135 - 138
Copyright
Copyright © International Astronomical Union 2013 

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