Nulls subpulse drift and mode-switching in pulsars: the polar-cap surface
arXiv:1204.4627 · doi:10.1111/j.1365-2966.2012.21148.x
Abstract
Little attention has so far been paid to the division of the observed population between pulsars of the two spin directions that are possible. Almost all pulsars with positive corotational charge density at the polar caps are expected to satisfy space-charge limited flow boundary conditions. Charge separation by blackbody photo-electric transitions in moving ions limits the acceleration potential, analogously with the more usually considered pair creation. But the limitation is more severe so that proton and ion energies can be relativistic but not ultra-relativistic, and these allow the growth of Langmuir-mode induced turbulence that couples directly with the radiation field, as shown by Asseo, Pelletier & Sol. The consequences of this, and of the several possible physical states of the polar cap, are described, qualitatively, as possible explanations for the complex phenomena of nulls, subpulse drift and mode-switching observed in subsets of pulsars.
To be published in Monthly Notices of the Royal Astronomical society; 11 pages
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- Pulsar emission: Langmuir modes in a relativistic multi-component plasma
- Linear-drifting sub-pulse sources in radio pulsars
- PSR B1133+16: radio emission height and plasma composition
- Ion-proton pulsars
- The mechanism of coherent radio emission in some classes of pulsar
- Physics of radio emission in the long-period pulsars
- Antenna source of radio-frequency emission in ion-proton pulsars