Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....61..685m&link_type=abstract
Astronomy and Astrophysics, vol. 61, no. 5, Dec. 1977, p. 685-693.
Astronomy and Astrophysics
Astrophysics
15
Ohmic Dissipation, Solar Corona, Solar Gravitation, Solar Prominences, Astronomical Models, Circuits, Convection, Flow Velocity, Ionic Diffusion, Lorentz Gas, Photosphere, Planetary Gravitation, Solar Magnetic Field, Vertical Motion, Weight (Mass)
Scientific paper
Two possible causes of the observed downward mass loss in quiescent prominences are considered: Joule dissipation in subphotospheric regions and downward diffusion of neutral atoms due to gravity. A model of the complete electrical circuit in a quiescent prominence is examined in which current lines are closed in the convection zone. Arguments are presented suggesting that Joule dissipation occurs mainly in the convection zone, and it is shown that the resulting downward velocity of a prominence could be as high as several hundred meters per second. The possibility is discussed that material motions in the photosphere and the convection zone may act as a current generator in addition to the motion of the prominence itself. Downward diffusive motion of neutral atoms in a prominence as a result of gravity are studied quantitatively, taking into account magnetic-field-induced anisotropies in momentum transfer between particles. It is concluded that this process allows only slow downward differential motions and is therefore incapable of explaining the observed mass loss.
Heyvaerts Jean
Mercier Claude
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