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Enthalpy-Based Thermal Evolution of Loops: III. Comparison of Zero-Dimensional ModelsZero 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 (EBTEL) model, all stages of the loop evolution. Empirical models can lead to low coronal densities, spurious delays between the peak density and temperature, and, for short heating pulses, overly short loop lifetimes.
Document ID
20120015711
Acquisition Source
Goddard Space Flight Center
Document Type
Preprint (Draft being sent to journal)
Authors
Cargill, P. J.
(Imperial Coll. of London London, United Kingdom)
Bradshaw, Stephen J.
(Rice Univ. Houston, TX, United States)
Klimchuk, James A.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 26, 2013
Publication Date
June 17, 2012
Subject Category
Astrophysics
Report/Patent Number
GSFC.JA.7168.2012
Distribution Limits
Public
Copyright
Public Use Permitted.
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