The structure of coronal magnetic loops |
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Authors: | Riccardo Giachetti Gerard Van Hoven Claudio Chiuderi |
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Affiliation: | (1) Osservatorio Astrofisico di Arcetri, Firenze, Italy;(2) Osservatorio Astrofisico di Arcetri, Firenze, Italy;(3) University of California, 92717 Irvine, Calif., U.S.A.;(4) Instituto di Astronomia, Università di Firenze, Firenze, Italy;(5) Scuola Normale Superiore, Pisa, Italy |
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Abstract: | We present the second part of a complete theory for the plasma and field structure of a cool coronal arch, corresponding to those observed in the EUV from Skylab. The global magneto-hydrodynamic (MHD) stability of a previously described equilibrium-loop model is evaluated, and compared with that of an unmodified ambient force-free field. The influence of the photospheric boundary condition is also evaluated, producing a specification of stability limits which depend on the relative field and plasma pressures and scale widths. The resulting restrictions on the allowable field configuration of a coronal loop are then compared with observed values. The implications of this general method for deducing small-scale coronal magnetic-field structure from the measured plasma profile of an emissive feature are also described. |
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