Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...256l...9g&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 256, no. 1, p. L9, L10.
Astronomy and Astrophysics
Astrophysics
Hot Stars, Neutron Stars, Poloidal Flux, Stellar Envelopes, Stellar Magnetic Fields, Heat Flux, Liquid Phases, Temperature Gradients
Scientific paper
If a strong temperature gradient exists in the liquid layer of neutron star envelopes the interaction of the heat flux with the magnetic field is very effective. For weak magnetic fields the induction and heat transport equations describing this interaction can be linearized. In this case the poloidal magnetic field component is not influenced by the evolution of both the toroidal field and the temperature distribution. However, the strong radial temperature gradient inside the liquid layer acts on the poloidal field by the thermal drift velocity, which leads to a nonnegligible convective term in the induction equation. The hotter the neutron star surface is, the larger is the temperature gradient and the more slowly the poloidal field in this region decays. During typical time scales of small-scale toroidal field growth due to thermoelectricity the poloidal field is nearly stationary.
Geppert Ulrich
Wiebicke H.-L.
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