Magnetohydrodynamic stability of coronal arcades. III. Sheared equilibrium fields

Journal Article · Wed Oct 01 04:00:00 EDT 1986 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/164612· OSTI ID:6640547

Cargill, P J; Hood, A W; Migliuolo, S

The ideal magnetohydrodynamic stability of solar coronal arcades where all the field lines are tied to the photosphere is examined. Two sets of photospheric boundary conditions are examined, and the first detailed quantitative comparison is presented. It is found that conditions where all components of the perturbation vanish at the photosphere are significantly more stable to interchange modes than those for which a displacement along the field lines is allowed there. Much stronger radial pressure gradients are needed to destabilize the former case. It is also found that three sample force-free fields are stable to all perturbations which were imposed. These results outline a pressing need for a more precise treatment of the transition region/corona boundary in stability problems. 25 references.

• Research Organization: National Center for Atmospheric Research, Boulder, CO; Saint Andrews Univ., Scotland; High Altitude Observatory, Boulder, CO
• OSTI ID: 6640547
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 309; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640104* -- Astrophysics & Cosmology-- Solar Phenomena
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ATMOSPHERES
BOUNDARY CONDITIONS
FLUID MECHANICS
HYDRODYNAMICS
MAGNETIC FIELDS
MAGNETIC FLUX
MAGNETOHYDRODYNAMICS
MECHANICS
PERTURBATION THEORY
PHOTOSPHERE
SOLAR ACTIVITY
SOLAR ATMOSPHERE
SOLAR CORONA
SOLAR FLARES
SOLAR PROMINENCES
STABILITY
STELLAR ATMOSPHERES
STELLAR CORONAE