Modelling the solar transition region using an adaptive conduction method

被引:22
作者
Johnston, C. D. [1 ]
Cargill, P. J. [1 ,2 ]
Hood, A. W. [1 ]
De Moortel, I. [1 ,3 ]
Bradshaw, S. J. [4 ]
Vaseekar, A. C. [1 ]
机构
[1] Univ St Andrews, Sch Math & Stat, St Andrews KY16 9SS, Fife, Scotland
[2] Imperial Coll, Blackett Lab, Space & Atmospher Phys, London SW7 2BW, England
[3] Univ Oslo, Rosseland Ctr Solar Phys, POB 1029, N-0315 Oslo, Norway
[4] Rice Univ, Dept Phys & Astron, Houston, TX 77005 USA
基金
英国科学技术设施理事会; 欧盟地平线“2020”; 美国国家科学基金会;
关键词
hydrodynamics; magnetohydrodynamics (MHD); Sun: transition region; Sun: chromosphere; Sun: corona; Sun: flares; CORONAL LOOPS; CODE;
D O I
10.1051/0004-6361/201936979
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Modelling the solar Transition Region with the use of an Adaptive Conduction (TRAC) method permits fast and accurate numerical solutions of the field-aligned hydrodynamic equations, capturing the enthalpy exchange between the corona and transition region, when the corona undergoes impulsive heating. The TRAC method eliminates the need for highly resolved numerical grids in the transition region and the commensurate very short time steps that are required for numerical stability. When employed with coarse spatial resolutions, typically achieved in multi-dimensional magnetohydrodynamic codes, the errors at peak density are less than 5% and the computation time is three orders of magnitude faster than fully resolved field-aligned models. This paper presents further examples that demonstrate the versatility and robustness of the method over a range of heating events, including impulsive and quasi-steady footpoint heating. A detailed analytical assessment of the TRAC method is also presented, showing that the approach works through all phases of an impulsive heating event because (i) the total radiative losses and (ii) the total heating when integrated over the transition region are both preserved at all temperatures under the broadening modifications of the method. The results from the numerical simulations complement this conclusion.
引用
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页数:19
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