Physics – Plasma Physics
Scientific paper
May 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...213..869v&link_type=abstract
Astrophysical Journal, Part 1, vol. 213, May 1, 1977, p. 869-873. Research supported by the Consiglio Nazionale delle Ricerche
Physics
Plasma Physics
35
Magnetic Field Configurations, Magnetohydrodynamic Stability, Solar Corona, Solar Magnetic Field, Astronomical Models, Far Ultraviolet Radiation, Force-Free Magnetic Fields, Plasma Physics, Pressure Gradients, Solar Physics
Scientific paper
A plasma-physics model of a stable active-region arch is presented which corresponds to the structure observed in the EUV. Pressure gradients are seen, so that the equilibrium magnetic field must depart from the force-free form valid in the surrounding corona. The data and the approximate cylindrical symmetry are exploited to develop a modified form of the commonly assumed sheared-spiral structure. The dynamic MHD behavior of this pressure/field model is then evaluated by the Newcomb criterion (1960) from controlled-fusion physics, and the results show short-wavelength stability in a specific parameter range. For pressure profiles with widths of the order of the magnetic-field scale, the possibility is demonstrated that such arches can persist for reasonable periods. Finally, the spatial proportions and magnetic fields of a characteristic stable coronal loop are described.
Chiuderi Claudio
Giachetti Riccardo
van Hoven Gerard
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