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Determining whether the squashing factor, Q, would be a good indicator of reconnection in a resistive MHD experiment devoid of null points

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Determining whether the squashing factor, Q, would be a good indicator of reconnection in a resistive MHD experiment devoid of null points. / Reid, J.; Parnell, C. E.; Hood, A. W.; Browning, P. K.

In: Astronomy & Astrophysics, Vol. 633, A92, 16.01.2020.

Research output: Contribution to journalArticle

Harvard

Reid, J, Parnell, CE, Hood, AW & Browning, PK 2020, 'Determining whether the squashing factor, Q, would be a good indicator of reconnection in a resistive MHD experiment devoid of null points', Astronomy & Astrophysics, vol. 633, A92. https://doi.org/10.1051/0004-6361/201936832

APA

Reid, J., Parnell, C. E., Hood, A. W., & Browning, P. K. (2020). Determining whether the squashing factor, Q, would be a good indicator of reconnection in a resistive MHD experiment devoid of null points. Astronomy & Astrophysics, 633, [A92]. https://doi.org/10.1051/0004-6361/201936832

Vancouver

Reid J, Parnell CE, Hood AW, Browning PK. Determining whether the squashing factor, Q, would be a good indicator of reconnection in a resistive MHD experiment devoid of null points. Astronomy & Astrophysics. 2020 Jan 16;633. A92. https://doi.org/10.1051/0004-6361/201936832

Author

Reid, J. ; Parnell, C. E. ; Hood, A. W. ; Browning, P. K. / Determining whether the squashing factor, Q, would be a good indicator of reconnection in a resistive MHD experiment devoid of null points. In: Astronomy & Astrophysics. 2020 ; Vol. 633.

Bibtex - Download

@article{82a139befe594a669535d21b6dc49705,
title = "Determining whether the squashing factor, Q, would be a good indicator of reconnection in a resistive MHD experiment devoid of null points",
abstract = "The squashing factor of a magnetic field, Q, is commonly used as an indicator of magnetic reconnection, but few studies seek to evaluate how reliable it is in comparison with other possible reconnection indicators. By using a full, self-consistent, three-dimensional, resistive magnetohydrodynamic experiment of interacting magnetic strands constituting a coronal loop, Q and several different quantities are determined. Each is then compared with the necessary and sufficient condition for reconnection, namely the integral along a field line of the component of the electric field parallel to the magnetic field. Among the reconnection indicators explored, we find the squashing factor less successful when compared with alternatives, such as Ohmic heating. In a reconnecting magnetic field devoid of null points, our work suggests that Q, being a geometric measure of the magnetic field, is not a reliable indicator of the onset or a diagnostic of the location of magnetic reconnection in some configurations.",
keywords = "Sun: corona, Sun: magnetic fields, Magnetic reconnection, Magnetohydrodynamics (MHD)",
author = "J. Reid and Parnell, {C. E.} and Hood, {A. W.} and Browning, {P. K.}",
note = "Funding: Carnegie Trust for the Universities of Scotland; Science and Technology Facilities Council (grants ST/S000402/1 and ST/P000428/1).",
year = "2020",
month = jan,
day = "16",
doi = "10.1051/0004-6361/201936832",
language = "English",
volume = "633",
journal = "Astronomy & Astrophysics",
issn = "0004-6361",
publisher = "EDP SCIENCES S A",

}

RIS (suitable for import to EndNote) - Download

TY - JOUR

T1 - Determining whether the squashing factor, Q, would be a good indicator of reconnection in a resistive MHD experiment devoid of null points

AU - Reid, J.

AU - Parnell, C. E.

AU - Hood, A. W.

AU - Browning, P. K.

N1 - Funding: Carnegie Trust for the Universities of Scotland; Science and Technology Facilities Council (grants ST/S000402/1 and ST/P000428/1).

PY - 2020/1/16

Y1 - 2020/1/16

N2 - The squashing factor of a magnetic field, Q, is commonly used as an indicator of magnetic reconnection, but few studies seek to evaluate how reliable it is in comparison with other possible reconnection indicators. By using a full, self-consistent, three-dimensional, resistive magnetohydrodynamic experiment of interacting magnetic strands constituting a coronal loop, Q and several different quantities are determined. Each is then compared with the necessary and sufficient condition for reconnection, namely the integral along a field line of the component of the electric field parallel to the magnetic field. Among the reconnection indicators explored, we find the squashing factor less successful when compared with alternatives, such as Ohmic heating. In a reconnecting magnetic field devoid of null points, our work suggests that Q, being a geometric measure of the magnetic field, is not a reliable indicator of the onset or a diagnostic of the location of magnetic reconnection in some configurations.

AB - The squashing factor of a magnetic field, Q, is commonly used as an indicator of magnetic reconnection, but few studies seek to evaluate how reliable it is in comparison with other possible reconnection indicators. By using a full, self-consistent, three-dimensional, resistive magnetohydrodynamic experiment of interacting magnetic strands constituting a coronal loop, Q and several different quantities are determined. Each is then compared with the necessary and sufficient condition for reconnection, namely the integral along a field line of the component of the electric field parallel to the magnetic field. Among the reconnection indicators explored, we find the squashing factor less successful when compared with alternatives, such as Ohmic heating. In a reconnecting magnetic field devoid of null points, our work suggests that Q, being a geometric measure of the magnetic field, is not a reliable indicator of the onset or a diagnostic of the location of magnetic reconnection in some configurations.

KW - Sun: corona

KW - Sun: magnetic fields

KW - Magnetic reconnection

KW - Magnetohydrodynamics (MHD)

U2 - 10.1051/0004-6361/201936832

DO - 10.1051/0004-6361/201936832

M3 - Article

VL - 633

JO - Astronomy & Astrophysics

JF - Astronomy & Astrophysics

SN - 0004-6361

M1 - A92

ER -

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