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Detailed Reference Information |
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. |
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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. |
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BACKGROUND DATA FILES |
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Abstract |
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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 |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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