Tuesday 11
Session I-1.3 Magnetic Field: Measurements and Models
Chairman: Duncan Mackay
› 12:00 - 12:15 (15min)
On the magnetic topology of quiescent prominence bubbles
Jaroslav Dudik  1, 2, *@  , Guillaume Aulanier  3@  , Brigitte Schmieder  3@  , Maciej Zapior  4@  , Petr Heinzel  5@  
1 : Department of Applied Mathematics and Theoretical Physics / Centre for Mathematical Sciences  (DAMTP/CMS)  -  Website
DAMTP, Centre for Mathematical Sciences, Wilberforce Road, Cambridge CB3 0WA -  United Kingdom
2 : Faculty of Mathematics, Physics and Computer Science, Comenius University
Mlynska Dolina F2 842 48 Bratislava Slovakia -  Slovakia
3 : Laboratoire d'études spatiales et d'instrumentation en astrophysique  (LESIA)  -  Website
Université Paris VI - Pierre et Marie Curie, Observatoire de Paris, INSU, CNRS : UMR8109, Université Paris VII - Paris Diderot
5, place Jules Janssen 92190 MEUDON -  France
4 : Astronomical Institute, University of Wroclaw
Kopernika 11 51622 Wroclaw Poland -  Poland
5 : Astronomical Institute, Academy of Sciences of the Czech Republic  -  Website
Fricova 298 251 65 Ondrejov -  Czech Republic
* : Corresponding author

Dudik, J., Aulanier, G., Schmieder, B., Zapior, M., Heinzel, P.


We report on observations and modeling of cusp-shaped polar-crown prominence with a large bubble observed by the SDO/AIA imager and H alpha MSDP spectrograph (Bialkow). Intensity cuts in the SDO/AIA coronal images show that the emission of the bubble viewed face-on is equivalent or less than the typical coronal emission away from the prominence. We built linear force-free models of the observed prominences. These models contain a flux rope perturbed by inclusion of one or two parasitic bipoles. Shearing these bipole lead to formation of cusp-shaped with bubbles similar to the observed ones. Projection effects create illusion of vertical structures, which are in fact composed of magnetic dips viewed nearly along the magnetic field. While the prominence body contains magnetic dips, the field geometry in the bubble is that of an arcade. These different flux systems are separated by fan surfaces of two magnetic null-points. The fan surfaces intersect at a separator located at the boundary between the bubble and the prominence body. We conjecture that the formation of plumes involves reconnection at the separator.


Online user: 1 RSS Feed