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Detailed Reference Information
Glover et al. 2000
Glover, A., Ranns, N.D.R., Harra, L.K. and Culhane, J.L. (2000). The onset and association of CMEs with sigmoidal active regions. Geophysical Research Letters 27: doi: 10.1029/2000GL000018. issn: 0094-8276.

Previous studies of active regions characterized 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.

BACKGROUND DATA FILES

Abstract

Keywords
Solar Physics, Astrophysics, and Astronomy, Coronal mass ejections, Solar Physics, Astrophysics, and Astronomy, Flares, Solar Physics, Astrophysics, and Astronomy, Magnetic fields, Solar Physics, Astrophysics, and Astronomy, Prominence eruptions
Journal
Geophysical Research Letters
http://www.agu.org/journals/gl/
Publisher
American Geophysical Union
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