Heating Effects from Driven Transverse and Alfvén Waves in Coronal Loops

Guo, Mingzhe, Van Doorsselaere, Tom, Karampelas, Konstantinos, Li, Bo, Antolin, Patrick and De Moortel, Ineke (2019) Heating Effects from Driven Transverse and Alfvén Waves in Coronal Loops. The Astrophysical Journal, 870 (2). p. 55. ISSN 1538-4357

[img]
Preview
Text
Guo_2019_ApJ_870_55.pdf - Published Version

Download (20MB) | Preview
[img]
Preview
Text
MingzheGuo2018.pdf - Accepted Version

Download (52MB) | Preview
Official URL: https://doi.org/10.3847/1538-4357/aaf1d0

Abstract

Recent numerical studies revealed that transverse motions of coronal loops can induce the Kelvin–Helmholtz instability (KHI). This process could be important in coronal heating because it leads to dissipation of energy at small spatial scale plasma interactions. Meanwhile, small-amplitude decayless oscillations in coronal loops have been discovered recently in observations of SDO/AIA. We model such oscillations in coronal loops and study wave heating effects, considering a kink and Alfvén driver separately and a mixed driver at the bottom of flux tubes. Both the transverse and Alfvén oscillations can lead to the KHI. Meanwhile, the Alfvén oscillations established in loops will experience phase mixing. Both processes will generate small spatial scale structures, which can help the dissipation of wave energy. Indeed, we observe the increase of internal energy and temperature in loop regions. The heating is more pronounced for the simulation containing the mixed kink and Alfvén driver. This means that the mixed wave modes can lead to a more efficient energy dissipation in the turbulent state of the plasma and that the KHI eddies act as an agent to dissipate energy in other wave modes. Furthermore, we also obtained forward-modeling results using the FoMo code. We obtained forward models that are very similar to the observations of decayless oscillations. Due to the limited resolution of instruments, neither Alfvén modes nor the fine structures are observable. Therefore, this numerical study shows that Alfvén modes probably can coexist with kink modes, leading to enhanced heating.

Item Type: Article
Uncontrolled Keywords: magnetohydrodynamics (MHD), Sun: corona, Sun: magnetic fields, waves
Subjects: F300 Physics
F500 Astronomy
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Elena Carlaw
Date Deposited: 15 Oct 2019 09:28
Last Modified: 15 Oct 2019 09:30
URI: http://nrl.northumbria.ac.uk/id/eprint/41107

Actions (login required)

View Item View Item

Downloads

Downloads per month over past year

View more statistics


Policies: NRL Policies | NRL University Deposit Policy | NRL Deposit Licence