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Research PapersNo Access

Ambipolar decay of magnetic field in magnetars and the observed magnetar activities

Indian Institute of Technology Jodhpur, Jheepasani, Rajasthan, India

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https://orcid.org/0000-0002-3080-9949

Indian Institute of Technology Jodhpur, Jheepasani, Rajasthan, India

E-mail Address: ms@iitj.ac.in

Corresponding author.

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https://doi.org/10.1142/S0217732321501443Cited by:0 (Source: Crossref)

Abstract

Magnetars are comparatively young neutron stars with ultra-strong surface magnetic field in the range $1 0^{14} - 1 0^{16} G$ $1 0^{14} – 1 0^{16} G$ . The old neutron stars have surface magnetic field somewhat less $\sim$ $\sim$ $1 0^{8} G$ $1 0^{8} G$ which clearly indicates the decay of field with time. One possible way of magnetic field decay is by ambipolar diffusion. We describe the general procedure to solve for the ambipolar velocity inside the star core without any approximation. With a realistic model of neutron star, we determine the ambipolar velocity configuration inside the neutron star core and hence find the ambipolar decay rate, associated timescales and the magnetic energy dissipated which is consistent with the magnetar observations.

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Journal cover image

Vol. 36, No. 20

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History

Received 28 December 2020

Revised 17 May 2021

Accepted 2 June 2021

Published: 2 July 2021

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