l.m. green et al- transient coronal sigmoids and rotating erupting flux ropes

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Solar Phys DOI 10.1007/s11207-007-9061-z Transient Coronal Sigmoids and Rotating Erupting Flux Ropes L.M. Green · B. Kliem · T. Török · L. van Driel-Gesztelyi · G.D.R. Attrill Received: 2 January 2007 / Accepted: 21 September 2007 © Springer Science+Business Media B.V. 2007 Abstract To determine the relationship between transient coronal (soft X-ray or EUV) sigmoids and erupting flux ropes, we analyse four events in which a transient sigmoid could be associated with a filament whose apex rotates upon eruption and two further events in which the two phenomena were spatially but not te mporally coincident. W e find the helicity sign of the erupting field and the direction of filament rotation to be consistent with the conversion of twist into writhe under the ideal MHD constraint of helicity conservation, thus supporting our assumption of flux rope topology for the rising filament. For positive (negative) helicity the filament apex rotates clockwise (counterclockwise), consistent with the flux rope taking on a reverse (forward) S shape, which is opposite to that observed for the sigmoid. This re- sult is incompatible with two models for sigmoid formation: one identifying sigmoids with upward arching kink-unstable flux ropes and one identifying sigmoids with a current layer betwee n two oppositel y sheared arcades. W e find instead that the observa tions agree well with the model by Tito v and Démoulin ( Astron. Astrophys. 351, 707, 1999), which identifies transient sigmoids with steepened current layers below rising flux ropes. Keywords Sun: sigmoids · Sun: flux rope · Sun: magnetic fields · Sun: eruptions L.M. Green ( ) · T. Török · L. van Driel-Gesztelyi · G.D.R. Attrill University College London, Mullard Space Science Laboratory, Holmbury St. Mary, Dorking, Surrey , RH5 6NT, UK e-mail: [email protected] B. Kliem Astrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany B. Kliem Kiepenheuer-Inst itut für Sonnenphysik, Schöneckstr . 6, 79104 Freiburg, Germany L. van Driel-Gesztelyi Observatoire de Paris, LESIA, FRE 2461 (CNRS), 92195 Meudon Principal Cedex, France L. van Driel-Gesztelyi Konkoly Observatory of the Hungarian Academy of Sciences, Budapest, Hungary

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Page 1: L.M. Green et al- Transient Coronal Sigmoids and Rotating Erupting Flux Ropes

8/3/2019 L.M. Green et al- Transient Coronal Sigmoids and Rotating Erupting Flux Ropes

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