Computation of the magnetic field around a quiescent prominence from observational data.
Abstract
A prominence is often modelized by a vertical infinitely thin massive current sheet {SIGMA} embedded in the coronal half-space {z>0}, and supported against a uniform gravitational field -gz{hat} by an x-invariant magnetic field which is potential outside {SIGMA}. In the framework of this simple model, we reconsider the problem of the determination of the magnetic field from the knowledge of its normal components on both {SIGMA} and the photospheric plane {z=0}, the values of these quantities being assumed to be extracted from actual observational data. It is shown that there is in general no regular field satisfying these boundary conditions. A sensible "regularization" procedure can however be applied to the problem, which allows to determine a field in a unique way. Conditions on the data for this field being actually able to support a prominence are established, and an explicit example is computed.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- January 1995
- Bibcode:
- 1995A&A...293..906L
- Keywords:
-
- SUN: CORONA;
- SUN: PROMINENCES;
- SUN: MAGNETIC FIELDS;
- MAGNETOHYDRODYNAMICS