Nonaxisymmetric Hall instability: A key to understanding magnetars
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Title: | Nonaxisymmetric Hall instability: A key to understanding magnetars |
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Authors: | Gourgouliatos, Konstantinos N. | Pons, José A. |
Research Group/s: | Astrofísica Relativista |
Center, Department or Service: | Universidad de Alicante. Departamento de Física Aplicada |
Keywords: | Magnetic fields | Neutron stars | Hall instability | Magnetars |
Knowledge Area: | Astronomía y Astrofísica |
Issue Date: | 30-Dec-2019 |
Publisher: | American Physical Society |
Citation: | Physical Review Research. 2019, 1: 032049(R). doi:10.1103/PhysRevResearch.1.032049 |
Abstract: | It is generally accepted that the nonlinear, dynamical evolution of magnetic fields in the interior of neutron stars plays a key role in the explanation of the observed phenomenology. Understanding the transfer of energy between toroidal and poloidal components, or between different scales, is of particular relevance. In this Rapid Communication, we present the first three-dimensional (3D) simulations of the Hall instability in a neutron star crust, confirming its existence for typical magnetar conditions. We compare our results to estimates obtained by a linear perturbation analysis, which discards any interpretation as numerical instabilities and confirms its physical origin. Interestingly, the Hall instability creates locally strong magnetic structures that occasionally can make the crust yield to the magnetic stresses and generates coronal loops, similar to the way solar coronal loops find their way out through the photosphere. This supports the viability of the mechanism, which has been proposed to explain magnetar outbursts. |
Sponsor: | This work used the DiRAC@Durham facility managed by the Institute for Computational Cosmology on behalf of the STFC DiRAC HPC Facility (www.dirac.ac.uk). The equipment was funded by BEIS capital funding via STFC capital Grants No. ST/P002293/1, No. ST/R002371/1 and No. ST/S002502/1, Durham University and STFC operations Grant No. ST/R000832/1. DiRAC is part of the National e-Infrastructure. |
URI: | http://hdl.handle.net/10045/101071 |
ISSN: | 2643-1564 |
DOI: | 10.1103/PhysRevResearch.1.032049 |
Language: | eng |
Type: | info:eu-repo/semantics/article |
Rights: | Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. |
Peer Review: | si |
Publisher version: | https://doi.org/10.1103/PhysRevResearch.1.032049 |
Appears in Collections: | INV - Astrofísica Relativista - Artículos de Revistas |
Files in This Item:
File | Description | Size | Format | |
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2019_Gourgouliatos_Pons_PhysRevRes.pdf | 1,63 MB | Adobe PDF | Open Preview | |
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