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Creation of magnetic spots at the neutron star surface

Geppert, Ulrich and Viganò, Daniele (2014) Creation of magnetic spots at the neutron star surface. Monthly Notices of the Royal Astronomical Society, 444 (4), pp. 3198-3208. Oxford University Press. doi: 10.1093/mnras/stu1675. ISSN 0035-8711.

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Official URL: http://cdsads.u-strasbg.fr/abs/2014MNRAS.444.3198G


According to the partially screened gap scenario, an efficient electron-positron pair creation, a general precondition of radio-pulsar activity, relies on the existence of magnetic spots, i.e. local concentrations of strong and small-scale magnetic field structures at the surface of neutron stars. They have a strong impact on the surface temperature, which is potentially observable. Here, we reinforce the idea that such magnetic spots can be formed by extracting magnetic energy from the toroidal field that resides in deep crustal layers, via the Hall drift. We study and discuss the magnetothermal evolution of qualitatively different neutron star models and initial magnetic field configurations that lead to the creation of magnetic spots. We find that magnetic spots can be created on a time-scale of 104 yr with magnetic field strengths ≳5 × 1013 G, provided almost the whole magnetic energy is stored in its toroidal component, and that the conductivity in the inner crust is not too large. The lifetime of the magnetic spots is at least ˜one million years, being longer if the initial field permeates both core and crust.

Item URL in elib:https://elib.dlr.de/104436/
Document Type:Article
Title:Creation of magnetic spots at the neutron star surface
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Geppert, UlrichUlrich.Geppert (at) dlr.deUNSPECIFIED
Viganò, DanieleUniversity of Alicante, SpainUNSPECIFIED
Date:November 2014
Journal or Publication Title:Monthly Notices of the Royal Astronomical Society
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1093/mnras/stu1675
Page Range:pp. 3198-3208
Publisher:Oxford University Press
Keywords:stars: magnetic field, pulsars: general
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space System Technology
DLR - Research area:Raumfahrt
DLR - Program:R SY - Space System Technology
DLR - Research theme (Project):R - Vorhaben Systemkonditionierung (old), Systemkonditionierung (old)
Location: Bremen
Institutes and Institutions:Institute of Space Systems > Systemkonditionierung
Deposited By: Geppert, Prof. Dr.rer.nat. habil. Ulrich
Deposited On:31 May 2016 12:04
Last Modified:06 Sep 2019 15:17

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