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Astron. Astrophys. 337, 883-886 (1998)
One possibility of dip formation in magnetic field lines associated with a filament
B.P. Filippov
Institute of Terrestrial Magnetism, Ionosphere and Radio
Wave Propagation, Russian Academy of Sciences, 142092, Troitsk Moscow
Region, Russia
Received 26 February 1998 / Accepted 10 June 1998
Abstract
The shape of a curve representing the axis of a filament of finite
length in equilibrium in an external magnetic field is studied. The
magnetic field of the filament is a twisted flux tube. The ends of the
tube are anchored at the photosphere. The direction of the filament
current corresponds to models of inverse polarity. When the angle
![[FORMULA]](img1.gif)
between the magnetic field and the axis of the
filament becomes greater than ![[FORMULA]](img2.gif)
, a dip arises in
the middle part of the equilibrium contour which represents the
filament axis. This dip can be treated as necessary condition for cold
dense material accumulation in the filament flux tube.
Key words: Sun:
activity 
Sun: corona
Sun: filaments
Sun: magnetic
fields
Sun: prominences
Send offprint requests to: B.P. Filippov
This article contains no SIMBAD objects.
Contents
- 1. Introduction
- 2. Physical model
- 3. Numerical calculations
- 4. Conclusions
- Acknowledgements
- References
© European Southern Observatory (ESO) 1998
Online publication: August 27, 1998
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