Concave-outward slow shocks in coronal mass ejections

Journal Article · Sat Sep 01 04:00:00 EDT 1990 · Journal of Geophysical Research; (United States)

DOI:https://doi.org/10.1029/JA095iA09p15251· OSTI ID:5314322

Steinolfson, R S ^[1]; Hundhausen, A J ^[2]

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1. Southwest Research Inst., San Antonio, TX (USA)
2. National Center for Atmospheric Research, Boulder, CO (USA)

The authors consider the formation of slow shocks in a simplifed model corona consisting of closed magnetic field lines near the coronal base with overlying open magnetic field lines. An increase in the magnetic field strength in the closed region is used to drive the corona outward, resulting in the generation of slow shocks for a suitable choice of parameters. The nature of the initial corona and the driver cause the field to be deflected around the expanding driver region and thereby produce a slow shock with a geometry that is concave upward (away from the Sun). The fastest-moving response generated in the corona occurs across nonlienar, fast-mode simple waves that are expansive over the driver region and compressive at the flanks. A nonlinear intermediate wave forms between the preceding fast wave and the following slow shock. This study not only demonstrates that concave-upward slow shocks can be formed in a magnetic environment, such as the simple model of the solar corona; it also provides the first evidence that nonlinear manifestations of all three wave modes may occur as the corona adjusts from ambient conditions to those produced by the driver.

• OSTI ID: 5314322
• Journal Information: Journal of Geophysical Research; (United States), Journal Name: Journal of Geophysical Research; (United States) Vol. 95:A9; ISSN 0148-0227; ISSN JGREA
• Country of Publication: United States
• Language: English

Related Subjects

640104* -- Astrophysics & Cosmology-- Solar Phenomena
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ATMOSPHERES
FLUID MECHANICS
HYDRODYNAMICS
MAGNETIC FIELD CONFIGURATIONS
MAGNETIC FIELDS
MAGNETOHYDRODYNAMICS
MASS TRANSFER
MATHEMATICAL MODELS
MECHANICS
NONLINEAR PROBLEMS
SHOCK WAVES
SOLAR ATMOSPHERE
SOLAR CORONA
STAR MODELS
STELLAR ATMOSPHERES
STELLAR CORONAE
WAVE PROPAGATION