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Title: Blob Formation and Ejection in Coronal Jets due to the Plasmoid and Kelvin–Helmholtz Instabilities

Abstract

In this paper we perform 2D resistive magnetohydrodynamic simulations of coronal jets driven by flux emergence along the lower boundary. The reconnection layers are susceptible to the formation of blobs that are ejected in the jet. Our simulation with low plasma β (Case I) shows that magnetic islands form easily and propagate upward in the jet. These islands are multithermal and thus are predicted to show up in hot channels (335 Å and 211 Å) and the cool channel (304 Å) in observations by the Atmospheric Imaging Assembly (AIA) on the Solar Dynamics Observatory. The islands have maximum temperatures of 8 MK, lifetimes of 120 s, diameters of 6 Mm, and velocities of 200 km s -1. These parameters are similar to the properties of blobs observed in extreme-ultraviolet (EUV) jets by AIA. The Kelvin–Helmholtz instability develops in our simulation with moderately high plasma β (Case II) and leads to the formation of bright vortex-like blobs above the multiple high magnetosonic Mach number regions that appear along the jet. These vortex-like blobs can also be identified in the AIA channels. However, they eventually move downward and disappear after the high magnetosonic Mach number regions disappear. In the lower plasma βmore » case, the lifetime for the jet is shorter, the jet and magnetic islands are formed with higher velocities and temperatures, the current-sheet fragments are more chaotic, and more magnetic islands are generated. Our results show that the plasmoid instability and Kelvin–Helmholtz instability along the jet are both possible causes of the formation of blobs observed at EUV wavelengths.« less

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4]
  1. Chinese Academy of Sciences (CAS), Beijing (China). Yunnan Observatories, and Center for Astronomical Mega-Science
  2. Chinese Academy of Sciences (CAS), Beijing (China). Key Lab. for Dark Matter and Space Science, Purple Mountain Observatory
  3. Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (United States)
  4. Chinese Academy of Sciences (CAS), Beijing (China). Yunnan Observatories
Publication Date:
Research Org.:
Smithsonian Institute, Washington, DC (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1537186
Grant/Contract Number:  
SC0016363
Resource Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal (Online); Journal Volume: 841; Journal Issue: 1; Journal ID: ISSN 1538-4357
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
Astronomy & Astrophysics; instabilities; magnetic reconnection; magnetohydrodynamics (MHD); methods: numerical; Sun: activity

Citation Formats

Ni, Lei, Zhang, Qing-Min, Murphy, Nicholas A., and Lin, Jun. Blob Formation and Ejection in Coronal Jets due to the Plasmoid and Kelvin–Helmholtz Instabilities. United States: N. p., 2017. Web. doi:10.3847/1538-4357/aa6ffe.
Ni, Lei, Zhang, Qing-Min, Murphy, Nicholas A., & Lin, Jun. Blob Formation and Ejection in Coronal Jets due to the Plasmoid and Kelvin–Helmholtz Instabilities. United States. doi:10.3847/1538-4357/aa6ffe.
Ni, Lei, Zhang, Qing-Min, Murphy, Nicholas A., and Lin, Jun. Fri . "Blob Formation and Ejection in Coronal Jets due to the Plasmoid and Kelvin–Helmholtz Instabilities". United States. doi:10.3847/1538-4357/aa6ffe. https://www.osti.gov/servlets/purl/1537186.
@article{osti_1537186,
title = {Blob Formation and Ejection in Coronal Jets due to the Plasmoid and Kelvin–Helmholtz Instabilities},
author = {Ni, Lei and Zhang, Qing-Min and Murphy, Nicholas A. and Lin, Jun},
abstractNote = {In this paper we perform 2D resistive magnetohydrodynamic simulations of coronal jets driven by flux emergence along the lower boundary. The reconnection layers are susceptible to the formation of blobs that are ejected in the jet. Our simulation with low plasma β (Case I) shows that magnetic islands form easily and propagate upward in the jet. These islands are multithermal and thus are predicted to show up in hot channels (335 Å and 211 Å) and the cool channel (304 Å) in observations by the Atmospheric Imaging Assembly (AIA) on the Solar Dynamics Observatory. The islands have maximum temperatures of 8 MK, lifetimes of 120 s, diameters of 6 Mm, and velocities of 200 km s-1. These parameters are similar to the properties of blobs observed in extreme-ultraviolet (EUV) jets by AIA. The Kelvin–Helmholtz instability develops in our simulation with moderately high plasma β (Case II) and leads to the formation of bright vortex-like blobs above the multiple high magnetosonic Mach number regions that appear along the jet. These vortex-like blobs can also be identified in the AIA channels. However, they eventually move downward and disappear after the high magnetosonic Mach number regions disappear. In the lower plasma β case, the lifetime for the jet is shorter, the jet and magnetic islands are formed with higher velocities and temperatures, the current-sheet fragments are more chaotic, and more magnetic islands are generated. Our results show that the plasmoid instability and Kelvin–Helmholtz instability along the jet are both possible causes of the formation of blobs observed at EUV wavelengths.},
doi = {10.3847/1538-4357/aa6ffe},
journal = {The Astrophysical Journal (Online)},
number = 1,
volume = 841,
place = {United States},
year = {2017},
month = {5}
}

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Cited by: 16 works
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