@article{Johnston:2019:0004-6361/201834742,
author = {Johnston, C and Cargill, P and antolin, P and hood, A and de, moortel I and Bradshaw, S},
doi = {0004-6361/201834742},
journal = {Astronomy and Astrophysics},
title = {The effects of numerical resolution, heating timescales and background heating on thermal non-equilibrium in coronal loops},
url = {http://dx.doi.org/10.1051/0004-6361/201834742},
volume = {625},
year = {2019}
}

Download

TY  - JOUR
AB  - Thermal non-equilibrium (TNE) is believed to be a potentially important process in understanding some properties ofthe magnetically closed solar corona. Through one-dimensional hydrodynamic models, this paper addresses the importanceof the numerical spatial resolution, footpoint heating timescales and background heating on TNE. Inadequatetransition region (TR) resolution can lead to significant discrepancies in TNE cycle behaviour, with TNE being suppressedin under-resolved loops. A convergence on the periodicity and plasma properties associated with TNE requiredspatial resolutions of less than 2 km for a loop of length 180 Mm. These numerical problems can be resolved using anapproximate method that models the TR as a discontinuity using a jump condition, as proposed by Johnston et al.(2017a,b). The resolution requirements (and so computational cost) are greatly reduced while retaining good agreementwith fully resolved results. Using this approximate method we (i) identify different regimes for the response of coronalloops to time-dependent footpoint heating including one where TNE does not arise and (ii) demonstrate that TNE in aloop with footpoint heating is suppressed unless the background heating is sufficiently small. The implications for thegenerality of TNE are discussed.
AU  - Johnston,C
AU  - Cargill,P
AU  - antolin,P
AU  - hood,A
AU  - de,moortel I
AU  - Bradshaw,S
DO  - 0004-6361/201834742
PY  - 2019///
SN  - 0004-6361
TI  - The effects of numerical resolution, heating timescales and background heating on thermal non-equilibrium in coronal loops
T2  - Astronomy and Astrophysics
UR  - http://dx.doi.org/10.1051/0004-6361/201834742
UR  - http://hdl.handle.net/10044/1/70216
VL  - 625
ER  - 

Download