Summary: Astron. Astrophys. 329, 11251137 (1998)
3-D magnetic configurations supporting prominences
I. The natural presence of lateral feet
G. Aulanier and P. DŽemoulin
Observatoire de Paris, section Meudon, DASOP, URA 2080 (CNRS), F-92195 Meudon Principal Cedex, France
Received 23 May 1997 / Accepted 27 August 1997
Abstract. It is now commonly accepted that prominence
plasma is supported in magnetic dips, in particular in twisted
flux-tubes. But present two-dimensional models are unable to
This requires three-dimensional models.
We modeled the field using linear force-free field equations.
Combining a small number of harmonics, and using observa-
tional constraints, we have found the area in the parameter space
where prominences are likely to be present. Then, adding 3-D
harmonics, we show that feet appear periodically underneath
the prominence body. For great helicity, the parameter space