skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: 3D MHD SIMULATION OF FLARE SUPRA-ARCADE DOWNFLOWS IN A TURBULENT CURRENT SHEET MEDIUM

Abstract

Supra-arcade downflows (SADs) are sunward, generally dark, plasma density depletions originated above posteruption flare arcades. In this paper, using 3D MHD simulations we investigate whether the SAD cavities can be produced by a direct combination of the tearing mode and Kelvin–Helmholtz instabilities leading to a turbulent current sheet (CS) medium or if the current sheet is merely the background where SADs are produced, triggered by an impulsive deposition of energy. We find that to give an account of the observational dark lane structures an addition of local energy, provided by a reconnection event, is required. We suggest that there may be a closed relation between characteristic SAD sizes and CS widths that must be satisfied to obtain an observable SAD.

Authors:
; ; ;  [1]
  1. Instituto de Investigaciones en Astronomía Teórica y Experimental IATE, Córdoba (Argentina)
Publication Date:
OSTI Identifier:
22522235
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 807; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; DEPOSITION; HELMHOLTZ INSTABILITY; MAGNETOHYDRODYNAMICS; PLASMA DENSITY; SUN; TEARING INSTABILITY; TURBULENCE

Citation Formats

Cécere, M., Zurbriggen, E., Costa, A., and Schneiter, M. 3D MHD SIMULATION OF FLARE SUPRA-ARCADE DOWNFLOWS IN A TURBULENT CURRENT SHEET MEDIUM. United States: N. p., 2015. Web. doi:10.1088/0004-637X/807/1/6.
Cécere, M., Zurbriggen, E., Costa, A., & Schneiter, M. 3D MHD SIMULATION OF FLARE SUPRA-ARCADE DOWNFLOWS IN A TURBULENT CURRENT SHEET MEDIUM. United States. https://doi.org/10.1088/0004-637X/807/1/6
Cécere, M., Zurbriggen, E., Costa, A., and Schneiter, M. 2015. "3D MHD SIMULATION OF FLARE SUPRA-ARCADE DOWNFLOWS IN A TURBULENT CURRENT SHEET MEDIUM". United States. https://doi.org/10.1088/0004-637X/807/1/6.
@article{osti_22522235,
title = {3D MHD SIMULATION OF FLARE SUPRA-ARCADE DOWNFLOWS IN A TURBULENT CURRENT SHEET MEDIUM},
author = {Cécere, M. and Zurbriggen, E. and Costa, A. and Schneiter, M.},
abstractNote = {Supra-arcade downflows (SADs) are sunward, generally dark, plasma density depletions originated above posteruption flare arcades. In this paper, using 3D MHD simulations we investigate whether the SAD cavities can be produced by a direct combination of the tearing mode and Kelvin–Helmholtz instabilities leading to a turbulent current sheet (CS) medium or if the current sheet is merely the background where SADs are produced, triggered by an impulsive deposition of energy. We find that to give an account of the observational dark lane structures an addition of local energy, provided by a reconnection event, is required. We suggest that there may be a closed relation between characteristic SAD sizes and CS widths that must be satisfied to obtain an observable SAD.},
doi = {10.1088/0004-637X/807/1/6},
url = {https://www.osti.gov/biblio/22522235}, journal = {Astrophysical Journal},
issn = {0004-637X},
number = 1,
volume = 807,
place = {United States},
year = {Wed Jul 01 00:00:00 EDT 2015},
month = {Wed Jul 01 00:00:00 EDT 2015}
}