Inner vacuum gap formation and drifting subpulses in pulsars

Details Inner vacuum gap formation and drifting subpulses in pulsars Inner vacuum gap formation and drifting subpulses in pulsars

2002-09-02

arxiv.org/abs/astro-ph/0209030v1

Astronomy and Astrophysics

Astrophysics

6 pages, 2 figures. To appear in the Proceedings of the 270. WE-Heraeus Seminar on Neutron Stars, Pulsars and Supernova Remnan

Scientific paper

The problem of formation of the inner vacuum gap in neutron stars with ${\bf\Omega}\cdot{\bf B}<0$ is considered. It is argued by means of the condition $T_i/T_s>1$, where $T_i$ is the melting temperature of surface $^{56}_{26}$Fe ions and $T_s$ is the actual temperature of the polar cap surface, that the inner vacuum gap can form, provided that the actual surface magnetic field is extremaly strong ($B_s\gtrsim 10^{13}$ G) and curved (${\cal R}<10^6$ cm), irrespective of the value of dipolar component measured from the pulsar spin down rate. The calculations are carried out for pulsars with drifting subpulses and/or periodic intensity modulations, in which the existence of the quasi steady vacuum gap discharging via ${\bf E}\times{\bf B}$ drifting sparks is almost unavoidable.

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