Ohmic decay of crustal neutron star magnetic fields

Details Ohmic decay of crustal neutron star magnetic fields Ohmic decay of crustal neutron star magnetic fields

Dec 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...323l..61s&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 323, Dec. 1, 1987, p. L61-L64.

Astronomy and Astrophysics

Astrophysics

93

Astronomical Models, Neutron Stars, Ohmic Dissipation, Pulsars, Stellar Magnetic Fields

Scientific paper

Calculations of ohmic decay of dipolar magnetic fields which are created so that they are initially confined to the crust are presented for the first time. It is shown that the field does not decay exponentially as has been assumed in most analyses of pulsar observations and that, if the field occupies the entire crust, it decays by less than a factor of order 100 in the Hubble time. Fields that are confined to the outer crust (ρ ≤ 1011g cm-3) decay too quickly, and again nonexponentially, in conflict with observations. Thus it is difficult to justify, at present, any of the models for field decay which have been proposed. The authors' results, therefore, suggest that neutron star magnetic fields may not decay significantly.

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