Fine structures in solar filaments. I - Observations and thermal stability

Details Fine structures in solar filaments. I - Observations and thermal stability Fine structures in solar filaments. I - Observations and thermal stability

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...183..142d&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 183, no. 1, Sept. 1987, p. 142-150.

Astronomy and Astrophysics

Astrophysics

21

Astronomical Spectroscopy, Fine Structure, H Alpha Line, Solar Prominences, Thermal Instability, Astronomical Maps, Astronomical Models, Parameter Identification, Solar Cooling

Scientific paper

Limb observations of quiescent prominences show very fine structures of less than one arcsecond. Here H-alpha observations on the disk, made with the Multichannel Subtractive Double Pass spectrograph operating at the Observatoire du Pic du Midi are presented. They show long fine structures in the body of the filament, both in intensity and velocity maps. Many prominence models ignore such fine structures and suppose that the quiescent filament is a uniform body such as is seen in unresolved images. It has been suggested that in a current-sheet model of a prominence, fine structures may be produced as a consequence of the tearing mode coupled to thermal instability. Here the role of parallel and orthogonal conduction on the stability of a periodic fine structure is investigated. Equilibrium conditions are found and growth rates determined for linear perturbations.

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