Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006a%26a...446..301a&link_type=abstract
Astronomy and Astrophysics, Volume 446, Issue 1, January IV 2006, pp.301-306
Astronomy and Astrophysics
Astrophysics
2
Sun: Filaments, Sun: Magnetic Fields, Sun: Uv Radiation
Scientific paper
The extensions of Hα filaments that are observed in EUV spectral lines require the presence of cool material in a large volume surrounding these filaments. This material can only be supported by magnetic fields with dips. Such dips can be generated by a sufficiently strong twisting of magnetic flux tubes. In the present paper we have extended earlier work to more realistic magnetic field configurations that are periodic in the x-direction. We derived approximate equilibria for twisted slender flux tubes and determined the region that contains dips. In addition we investigated the effects on our models of the mass loading due to a heavy prominence. Finally we compared our theoretical models with the EUV - observations. We conclude that these types of models are capable of explaining the basic features of the observations.
Anzer Ulrich
Heinzel Petr
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