Summary
If pulsar magnetic fields decay with a time constant of ∼ 106 years as suggested by measurements of pulsar periods and their time derivatives, then the contribution of the field decay in the form of Ohmic losses to the overall photon luminosity of a pulsar might not be negligible if the age of the pulsar exceeds ∼ 105 years.
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Lodenquai, J.F. Magnetic-field decay and pulsar cooling. Lett. Nuovo Cimento 41, 119–122 (1984). https://doi.org/10.1007/BF02730357
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DOI: https://doi.org/10.1007/BF02730357