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SUMMARY:On the Magnetic Structure of Quiescent Prominence Bubbles - Jarosl
 av Dudík (DAMTP)
DTSTART:20130219T130000Z
DTEND:20130219T140000Z
UID:TALK42534@talks.cam.ac.uk
CONTACT:Jérôme Guilet
DESCRIPTION:Solar filaments and prominences have been observed for more th
 an one and a half century. However\, the detailed nature of their magnetic
  structure and dynamics remain poorly understood. Here we analyze a cusp-s
 haped polar-crown prominence observed by the SDO/AIA imager and H alpha MS
 DP spectrograph (Bialkow). The prominence consists of two parts\, one of w
 hich show a large bubble underneath. Analysis of the AIA intensity profile
 s show that the bubble-related emission is equivalent or less than the cor
 onal intensity at the same altitude. The observed prominence is modeled by
  a linear force-free model containing a flux rope perturbed by inclusion 
 of parasitic bipoles. Sheared bipoles lead to formation of cusp-shaped pro
 minences with bubbles similar to the observed ones. Projection eects crea
 te illusion of vertical structures. While the prominence body contains mag
 netic dips\, the magnetic field geometry in the bubble is that of an arcad
 e. These different flux systems are separated by fan surfaces of two mag
 netic null-points. The fan surfaces intersect at a separator located at th
 e boundary between the bubble and the prominence body. We conjecture that 
 the formation of plumes involves reconnection at the separator.
LOCATION:MR14\,  Centre for Mathematical Sciences\, Wilberforce Road\, Cam
 bridge
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