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Title: The 2013 February 17 Sunquake in the Context of the Active Region's Magnetic Field Configuration

Abstract

Sunquakes are created by the hydrodynamic response of the lower atmosphere to a sudden deposition of energy and momentum. In this study, we investigate a sunquake that occurred in NOAA active region 11675 on 2013 February 17. Observations of the corona, chromosphere, and photosphere are brought together for the first time with a nonlinear force-free model of the active region’s magnetic field in order to probe the magnetic environment in which the sunquake was initiated. We find that the sunquake was associated with the destabilization of a flux rope and an associated M-class GOES flare. Active region 11675 was in its emergence phase at the time of the sunquake and photospheric motions caused by the emergence heavily modified the flux rope and its associated quasi-separatrix layers, eventually triggering the flux rope’s instability. The flux rope was surrounded by an extended envelope of field lines rooted in a small area at the approximate position of the sunquake. We argue that the configuration of the envelope, by interacting with the expanding flux rope, created a “magnetic lens” that may have focussed energy on one particular location of the photosphere, creating the necessary conditions for the initiation of the sunquake.

Authors:
; ; ;  [1];  [2];  [3]
  1. Mullard Space Science Laboratory, UCL, Holmbury St. Mary, Dorking, Surrey, RH5 6NT (United Kingdom)
  2. Department of Physics and Mathematics, University of Hull, Hull, HU6 7RX (United Kingdom)
  3. Dipartimento di Fisica e Astronomia—Sezione Astrofisica, Università degli Studi di Catania, Via S. Sofia 78, I-95123 Catania (Italy)
Publication Date:
OSTI Identifier:
22679713
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 849; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; APPROXIMATIONS; CHROMOSPHERE; DEPOSITION; HYDRODYNAMICS; INSTABILITY; LAYERS; MAGNETIC FIELD CONFIGURATIONS; MAGNETIC FIELDS; MASS; NONLINEAR PROBLEMS; PHOTOSPHERE; SIMULATION; SUN

Citation Formats

Green, L. M., Valori, G., Zuccarello, F. P., Matthews, S. A., Zharkov, S., and Guglielmino, S. L. The 2013 February 17 Sunquake in the Context of the Active Region's Magnetic Field Configuration. United States: N. p., 2017. Web. doi:10.3847/1538-4357/AA8DB6.
Green, L. M., Valori, G., Zuccarello, F. P., Matthews, S. A., Zharkov, S., & Guglielmino, S. L. The 2013 February 17 Sunquake in the Context of the Active Region's Magnetic Field Configuration. United States. doi:10.3847/1538-4357/AA8DB6.
Green, L. M., Valori, G., Zuccarello, F. P., Matthews, S. A., Zharkov, S., and Guglielmino, S. L. Wed . "The 2013 February 17 Sunquake in the Context of the Active Region's Magnetic Field Configuration". United States. doi:10.3847/1538-4357/AA8DB6.
@article{osti_22679713,
title = {The 2013 February 17 Sunquake in the Context of the Active Region's Magnetic Field Configuration},
author = {Green, L. M. and Valori, G. and Zuccarello, F. P. and Matthews, S. A. and Zharkov, S. and Guglielmino, S. L.},
abstractNote = {Sunquakes are created by the hydrodynamic response of the lower atmosphere to a sudden deposition of energy and momentum. In this study, we investigate a sunquake that occurred in NOAA active region 11675 on 2013 February 17. Observations of the corona, chromosphere, and photosphere are brought together for the first time with a nonlinear force-free model of the active region’s magnetic field in order to probe the magnetic environment in which the sunquake was initiated. We find that the sunquake was associated with the destabilization of a flux rope and an associated M-class GOES flare. Active region 11675 was in its emergence phase at the time of the sunquake and photospheric motions caused by the emergence heavily modified the flux rope and its associated quasi-separatrix layers, eventually triggering the flux rope’s instability. The flux rope was surrounded by an extended envelope of field lines rooted in a small area at the approximate position of the sunquake. We argue that the configuration of the envelope, by interacting with the expanding flux rope, created a “magnetic lens” that may have focussed energy on one particular location of the photosphere, creating the necessary conditions for the initiation of the sunquake.},
doi = {10.3847/1538-4357/AA8DB6},
journal = {Astrophysical Journal},
number = 1,
volume = 849,
place = {United States},
year = {Wed Nov 01 00:00:00 EDT 2017},
month = {Wed Nov 01 00:00:00 EDT 2017}
}