Heating and Cooling in Transversely Oscillating Coronal Loops Powered by Broadband, Multi-Directional Wave Drivers
Recent studies have identified the potential for coronal wave heating to balance radiative losses in a transversely oscillating low-density loop undergoing resonant absorption, phase mixing and the Kelvin–Helmholtz instability. This result relied on a continuous, resonant oscillatory driver acting o...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-01-01
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| Series: | Physics |
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| Online Access: | https://www.mdpi.com/2624-8174/5/1/11 |
| _version_ | 1797609419989581824 |
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| author | Thomas Howson Ineke De Moortel |
| author_facet | Thomas Howson Ineke De Moortel |
| author_sort | Thomas Howson |
| collection | DOAJ |
| description | Recent studies have identified the potential for coronal wave heating to balance radiative losses in a transversely oscillating low-density loop undergoing resonant absorption, phase mixing and the Kelvin–Helmholtz instability. This result relied on a continuous, resonant oscillatory driver acting on one of the loop footpoints and similar setups with non-resonant driving produce insufficient heating. Here, we consider broadband and multi-directional drivers with power in both resonant and non-resonant frequencies. Using three-dimensional magnetohydrodynamic simulations, we impose transverse, continuous velocity drivers at the footpoints of a coronal loop, which is dense in comparison to the background plasma. We include the effects of optically thin radiation and a uniform background heating term that maintains the temperature of the external plasma but is insufficient to balance energy losses within the loop. For both broadband and multi-directional drivers, we find that the energy dissipation rates are sufficient to balance the average energy losses throughout the simulation volume. Resonant components of the wave driver efficiently inject energy into the system and these frequencies dominate the energetics. Although the mean radiative losses are balanced, the loop core cools in all cases as the wave heating rates are locally insufficient, despite the relatively low density considered here. |
| first_indexed | 2024-03-11T06:01:07Z |
| format | Article |
| id | doaj.art-52da834a61334dd580b506eed9ddbdb1 |
| institution | Directory Open Access Journal |
| issn | 2624-8174 |
| language | English |
| last_indexed | 2024-03-11T06:01:07Z |
| publishDate | 2023-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Physics |
| spelling | doaj.art-52da834a61334dd580b506eed9ddbdb12023-11-17T13:20:14ZengMDPI AGPhysics2624-81742023-01-015114016010.3390/physics5010011Heating and Cooling in Transversely Oscillating Coronal Loops Powered by Broadband, Multi-Directional Wave DriversThomas Howson0Ineke De Moortel1School of Mathematics and Statistics, University of St Andrews, St Andrews, Fife KY16 9SS, UKSchool of Mathematics and Statistics, University of St Andrews, St Andrews, Fife KY16 9SS, UKRecent studies have identified the potential for coronal wave heating to balance radiative losses in a transversely oscillating low-density loop undergoing resonant absorption, phase mixing and the Kelvin–Helmholtz instability. This result relied on a continuous, resonant oscillatory driver acting on one of the loop footpoints and similar setups with non-resonant driving produce insufficient heating. Here, we consider broadband and multi-directional drivers with power in both resonant and non-resonant frequencies. Using three-dimensional magnetohydrodynamic simulations, we impose transverse, continuous velocity drivers at the footpoints of a coronal loop, which is dense in comparison to the background plasma. We include the effects of optically thin radiation and a uniform background heating term that maintains the temperature of the external plasma but is insufficient to balance energy losses within the loop. For both broadband and multi-directional drivers, we find that the energy dissipation rates are sufficient to balance the average energy losses throughout the simulation volume. Resonant components of the wave driver efficiently inject energy into the system and these frequencies dominate the energetics. Although the mean radiative losses are balanced, the loop core cools in all cases as the wave heating rates are locally insufficient, despite the relatively low density considered here.https://www.mdpi.com/2624-8174/5/1/11solar coronaMHD (magnetohydrodynamics) oscillationswave heatingKelvin–Helmholtz instability |
| spellingShingle | Thomas Howson Ineke De Moortel Heating and Cooling in Transversely Oscillating Coronal Loops Powered by Broadband, Multi-Directional Wave Drivers Physics solar corona MHD (magnetohydrodynamics) oscillations wave heating Kelvin–Helmholtz instability |
| title | Heating and Cooling in Transversely Oscillating Coronal Loops Powered by Broadband, Multi-Directional Wave Drivers |
| title_full | Heating and Cooling in Transversely Oscillating Coronal Loops Powered by Broadband, Multi-Directional Wave Drivers |
| title_fullStr | Heating and Cooling in Transversely Oscillating Coronal Loops Powered by Broadband, Multi-Directional Wave Drivers |
| title_full_unstemmed | Heating and Cooling in Transversely Oscillating Coronal Loops Powered by Broadband, Multi-Directional Wave Drivers |
| title_short | Heating and Cooling in Transversely Oscillating Coronal Loops Powered by Broadband, Multi-Directional Wave Drivers |
| title_sort | heating and cooling in transversely oscillating coronal loops powered by broadband multi directional wave drivers |
| topic | solar corona MHD (magnetohydrodynamics) oscillations wave heating Kelvin–Helmholtz instability |
| url | https://www.mdpi.com/2624-8174/5/1/11 |
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