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Title: DYNAMICS OF MAGNETIZED VORTEX TUBES IN THE SOLAR CHROMOSPHERE

Abstract

We use three-dimensional radiative MHD simulations to investigate the formation and dynamics of small-scale (less than 0.5 Mm in diameter) vortex tubes spontaneously generated by turbulent convection in quiet-Sun regions with an initially weak (10 G) mean magnetic field. The results show that the vortex tubes penetrate into the chromosphere and substantially affect the structure and dynamics of the solar atmosphere. The vortex tubes are mostly concentrated in intergranular lanes and are characterized by strong (near sonic) downflows and swirling motions that capture and twist magnetic field lines, forming magnetic flux tubes that expand with height and attain magnetic field strengths ranging from 200 G in the chromosphere to more than 1 kG in the photosphere. We investigate in detail the physical properties of these vortex tubes, including thermodynamic properties, flow dynamics, and kinetic and current helicities, and conclude that magnetized vortex tubes provide an important path for energy and momentum transfer from the convection zone into the chromosphere.

Authors:
;  [1];
  1. W. W. Hansen Experimental Physics Laboratory, Stanford University, Stanford, CA 94305 (United States)
Publication Date:
OSTI Identifier:
22047802
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal Letters
Additional Journal Information:
Journal Volume: 751; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 2041-8205
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASTRONOMY; ASTROPHYSICS; CHROMOSPHERE; COMPUTERIZED SIMULATION; CONVECTION; HELICITY; MAGNETIC FIELDS; MAGNETIC FLUX; MAGNETISM; MAGNETOHYDRODYNAMICS; MOMENTUM TRANSFER; PHOTOSPHERE; SUN; THERMODYNAMIC PROPERTIES; THREE-DIMENSIONAL CALCULATIONS; VORTICES; ZONES

Citation Formats

Kitiashvili, I N, Kosovichev, A G, Mansour, N N, and Wray, A. A., E-mail: irinasun@stanford.edu. DYNAMICS OF MAGNETIZED VORTEX TUBES IN THE SOLAR CHROMOSPHERE. United States: N. p., 2012. Web. doi:10.1088/2041-8205/751/1/L21.
Kitiashvili, I N, Kosovichev, A G, Mansour, N N, & Wray, A. A., E-mail: irinasun@stanford.edu. DYNAMICS OF MAGNETIZED VORTEX TUBES IN THE SOLAR CHROMOSPHERE. United States. https://doi.org/10.1088/2041-8205/751/1/L21
Kitiashvili, I N, Kosovichev, A G, Mansour, N N, and Wray, A. A., E-mail: irinasun@stanford.edu. 2012. "DYNAMICS OF MAGNETIZED VORTEX TUBES IN THE SOLAR CHROMOSPHERE". United States. https://doi.org/10.1088/2041-8205/751/1/L21.
@article{osti_22047802,
title = {DYNAMICS OF MAGNETIZED VORTEX TUBES IN THE SOLAR CHROMOSPHERE},
author = {Kitiashvili, I N and Kosovichev, A G and Mansour, N N and Wray, A. A., E-mail: irinasun@stanford.edu},
abstractNote = {We use three-dimensional radiative MHD simulations to investigate the formation and dynamics of small-scale (less than 0.5 Mm in diameter) vortex tubes spontaneously generated by turbulent convection in quiet-Sun regions with an initially weak (10 G) mean magnetic field. The results show that the vortex tubes penetrate into the chromosphere and substantially affect the structure and dynamics of the solar atmosphere. The vortex tubes are mostly concentrated in intergranular lanes and are characterized by strong (near sonic) downflows and swirling motions that capture and twist magnetic field lines, forming magnetic flux tubes that expand with height and attain magnetic field strengths ranging from 200 G in the chromosphere to more than 1 kG in the photosphere. We investigate in detail the physical properties of these vortex tubes, including thermodynamic properties, flow dynamics, and kinetic and current helicities, and conclude that magnetized vortex tubes provide an important path for energy and momentum transfer from the convection zone into the chromosphere.},
doi = {10.1088/2041-8205/751/1/L21},
url = {https://www.osti.gov/biblio/22047802}, journal = {Astrophysical Journal Letters},
issn = {2041-8205},
number = 1,
volume = 751,
place = {United States},
year = {Sun May 20 00:00:00 EDT 2012},
month = {Sun May 20 00:00:00 EDT 2012}
}