NDLI: Magnetar corona

Content Provider	Springer Nature Link
Author	Beloborodov, A. M. Thompson, C.
Copyright Year	2007
Abstract	Persistent high-energy emission of magnetars is produced by a plasma corona around the neutron star, with total energy output of ∼1036 erg/s. The corona forms as a result of sporadic starquakes that twist the external magnetic field of the star and induce electric currents in the closed magnetosphere. Once twisted, the magnetosphere cannot untwist immediately because of its self-induction. The self-induction electric field lifts particles from the stellar surface, accelerates them, and initiates avalanches of pair creation in the magnetosphere. The created plasma corona maintains the electric current demanded by curl B and regulates the self-induction e.m.f. by screening. This corona persists in dynamic equilibrium: it is continually lost to the stellar surface on the light-crossing time ∼10−4 s and replenished with new particles. In essence, the twisted magnetosphere acts as an accelerator that converts the toroidal field energy to particle kinetic energy. The voltage along the magnetic field lines is maintained near threshold for ignition of pair production, in the regime of self-organized criticality. The voltage is found to be about ∼1 GeV which is in agreement with the observed dissipation rate ∼1036 erg/s. The coronal particles impact the solid crust, knock out protons, and regulate the column density of the hydrostatic atmosphere of the star. The transition layer between the atmosphere and the corona is the likely source of the observed 100 keV emission. The corona also emits curvature radiation up to 1014 Hz and can supply the observed IR-optical luminosity.
Ending Page	639
Page Count	9
Starting Page	631
File Format	PDF
ISSN	0004640X
e-ISSN	1572946X
Journal	Astrophysics and Space Science
Issue Number	1-4
Volume Number	308
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2007-03-20
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	X-rays: stars Stars: coronae, magnetic fields, neutron Plasmas Astronomy
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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