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Enthalpy-Based Thermal Evolution of Loops: III. Comparison of Zero-Dimensional Models
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Author and Affiliation:
Cargill, P. J.(Imperial Coll. of London, The Blackett Lab., London, United Kingdom);
Bradshaw, Stephen J.(Rice Univ., Dept. of Physics and Astronomy, Houston, TX, United States);
Klimchuk, James A.(NASA Goddard Space Flight Center, Greenbelt, MD, United States)
Abstract: 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 (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.
Publication Date: Jun 17, 2012
Document ID:
20120015711
(Acquired Nov 16, 2012)
Subject Category: ASTROPHYSICS
Report/Patent Number: GSFC.JA.7168.2012
Document Type: Preprint
Financial Sponsor: NASA Goddard Space Flight Center; Greenbelt, MD, United States
Organization Source: NASA Goddard Space Flight Center; Greenbelt, MD, United States
Description: 33p; In English; Original contains black and white illustrations
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright; Distribution as joint owner in the copyright
NASA Terms: CHROMOSPHERE; COOLING; CORONAL LOOPS; CORONAS; CYCLES; ENERGY CONSERVATION; ENTHALPY; HEATING; PULSE HEATING; TIME DEPENDENCE
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