Physics
Scientific paper
Mar 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988soph..116...45v&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 116, no. 1, 1988, p. 45-60.
Physics
40
Magnetic Field Configurations, Solar Magnetic Field, Solar Prominences, Electric Current, Equilibrium Equations, Helices, Magnetohydrodynamic Stability
Scientific paper
Observations of internal structure and development of four helical prominences are presented. The authors assume that the helically twisted fine structure threads are outlining magnetic field lines. They found that it is possible to describe the magnetic fields by the uniform twist configuration, with the twists ranging between 2 π and 7 π. The lower limits for the magnetic fields were estimated. The stability of the studied prominences is discussed and the criteria for the onset of eruptive instability are established for a prominence modelled as a twisted and elliptically curved magnetic flux tube which is anchored in the photosphere and affected by its "mirror-current". The observed examples of eruptive prominences agree very well with the predictions. Possible applications to the two-ribbon flare process are outlined. Properties of stable cylindrical prominences in equilibrium are analyzed and a criterion for the distinction between the Kuperus-Raadu and Kippenhahn-Schlüter types of prominences is proposed.
Brajsa Roman
Dzubur A.
Ruzdjak Vladimir
Vrsnak Bojan
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