Projects per year
Abstract
Thermal non-equilibrium (TNE) is believed to be a potentially important process in understanding some properties of the magnetically closed solar corona. Through one-dimensional hydrodynamic models, this paper addresses the importance of the numerical spatial resolution, footpoint heating timescales and background heating on TNE. Inadequate transition region (TR) resolution can lead to significant discrepancies in TNE cycle behaviour, with TNE being suppressed in under-resolved loops. A convergence on the periodicity and plasma properties associated with TNE required spatial resolutions of less than 2 km for a loop of length 180 Mm. These numerical problems can be resolved using an approximate method that models the TR as a discontinuity using a jump condition, as proposed by Johnston et al. (2017a, A&A, 597, A81; 2017b, A&A, 605, A8). The resolution requirements (and so computational cost) are greatly reduced while retaining good agreement with fully resolved results. Using this approximate method we (i) identify different regimes for the response of coronal loops to time-dependent footpoint heating including one where TNE does not arise and (ii) demonstrate that TNE in a loop with footpoint heating is suppressed unless the background heating is sufficiently small. The implications for the generality of TNE are discussed.
Original language | English |
---|---|
Article number | A149 |
Number of pages | 14 |
Journal | Astronomy & Astrophysics |
Volume | 625 |
Early online date | 29 May 2019 |
DOIs | |
Publication status | Published - May 2019 |
Keywords
- Sun: corona
- Sun: magnetic fields
- Magnetohydrodynamics (MHD)
- Hydrodyanmics
- Sun: transition region
- Sun: oscillations
Fingerprint
Dive into the research topics of 'The effects of numerical resolution, heating timescales and background heating on thermal non-equilibrium in coronal loops'. Together they form a unique fingerprint.Projects
- 3 Finished
-
The Cool Alter-Ego of the Hot: The Cool Alter-ego of the Hot Solar Corona
Antolin, P. (PI)
1/06/18 → 31/05/23
Project: Fellowship
-
Solar and Magnetospheric - Consolidated: Solar and Magnetospheric Magnetohydrodynamics and Plasmas: Theory and Application
Hood, A. W. (PI), Archontis, V. (CoI), De Moortel, I. (CoI), Mackay, D. H. (CoI), Neukirch, T. (CoI), Parnell, C. E. (CoI) & Wright, A. N. (CoI)
Science & Technology Facilities Council
1/04/16 → 31/03/19
Project: Standard
-
H2020 ERC Consolidator - CORONALDOLLS: CORONALDOLLS
De Moortel, I. (PI)
1/10/15 → 30/09/20
Project: Standard