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The onset and association of CMEs with sigmoidal active regions

Glover, A; Ranns, NDR; Harra, LK; Culhane, JL; (2000) The onset and association of CMEs with sigmoidal active regions. Geophysical Research Letters , 27 (14) 2161 - 2164. 10.1029/2000GL000018. Green open access

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Abstract

Previous studies of active regions characterised by Soft X-ray S or inverse-S morphology [Canfield et al., 1999], have found these regions to possess a higher probability of eruption. In such cases, CME launch has been inferred using X-ray proxies to indicate eruption. Active regions observed during 1997, previously categorised as both sigmoidal and eruptive [Canfield, 1999], have been selected for further study, incorporating SoHO-LASCO, SoHO-EIT and ground based H-alpha data. Our results allow re-classification into three main categories; sigmoidal, non-sigmoidal and active regions appearing sigmoidal due to the projection of many loops. Although the reduced dataset size prevents a statistical measure of significance, we note that regions comprising a single S (or inverse-S) shaped structure are more frequently associated with a CME than those classed as non-sigmoidal. This motivates the study of a larger dataset and highlights the need for a quantitative observational definition of the term "sigmoid".

Type: Article
Title: The onset and association of CMEs with sigmoidal active regions
Open access status: An open access version is available from UCL Discovery
DOI: 10.1029/2000GL000018
Publisher version: http://dx.doi.org/10.1029/2000GL000018
Language: English
Additional information: Copyright 2000 by the American Geophysical Union
Keywords: Telescope, Mission
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics
URI: https://discovery.ucl.ac.uk/id/eprint/94039
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