A magnetic scaleheight: the effect of toroidal magnetic fields on the thickness of accretion discs

Details A magnetic scaleheight: the effect of toroidal magnetic fields on the thickness of accretion discs A magnetic scaleheight: the effect of toroidal magnetic fields on the thickness of accretion discs

Oct 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999mnras.309..443l&link_type=abstract

Monthly Notices, Volume 309, Issue 2, pp. 443-446.

Computer Science

4

Scientific paper

We consider accreting systems in which the central object interacts, via the agency of its magnetic field, with the disc that surrounds it. The disc is turbulent and, so, has a finite effective conductivity. The field sweeps across the face of the disc, thereby forming a current that is directed radially within the disc. In turn, this disc current creates a toroidal field, where the interaction between the disc current and the toroidal field produces a Lorentz force that compresses the disc. We investigate this compression, which creates a magnetic scaleheight of the disc that can be much smaller than the conventional scaleheight. We derive an analytic expression for the magnetic scaleheight and apply it to fully ionized discs.

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