ENTHALPY-BASED THERMAL EVOLUTION OF LOOPS. III. COMPARISON OF ZERO-DIMENSIONAL MODELS

Zero-dimensional (0D) hydrodynamic models provide a simple and quick way to study the thermal evolution of coronal loops subjected to time-dependent heating. This paper presents a comparison of a number of 0D models that have been published in the past and is intended to provide a guide for those in...

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Bibliographic Details
Published in:The Astrophysical journal 2012-10, Vol.758 (1), p.1-13
Main Authors: Cargill, P J, Bradshaw, S J, Klimchuk, J A
Format: Article
Language:English
Subjects:
ASTRONOMY
ASTROPHYSICS
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
CHROMOSPHERE
COMPARATIVE EVALUATIONS
Computational fluid dynamics
COOLING
Coronal loops
Coronas
ENERGY CONSERVATION
ENTHALPY
Evolution
Exchange
Fluid flow
HEATING
MASS
PLASMA
SOLAR CORONA
SUN
Thermal evolution
TIME DEPENDENCE
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Summary:Zero-dimensional (0D) hydrodynamic models provide a simple and quick way to study the thermal evolution of coronal loops subjected to time-dependent heating. This paper presents a comparison of a number of 0D models that have been published in the past and is intended to provide a guide for those interested in either using the old models or developing new ones. The principal difference between the models is the way the exchange of mass and energy between corona, transition region, and chromosphere is treated, as plasma cycles into and out of a loop during a heating-cooling cycle. It is shown that models based on the principles of mass and energy conservation can give satisfactory results at some or, in the case of the Enthalpy-based Thermal Evolution of Loops model, all stages of the loop evolution. Empirical models can have significant difficulties in obtaining accurate behavior due to invocation of assumptions incompatible with the correct exchange of mass and energy between corona, transition region, and chromosphere.
ISSN:0004-637X
1538-4357
DOI:10.1088/0004-637X/758/1/5