Drifting subpulses and inner acceleration regions in radio pulsars
By J. Gil, G. Melikidze, U. Geppert. 2003
155 citations recorded by the source corpus.
The classical vacuum gap model of Ruderman & Sutherland, in which spark-associated subbeams of subpulse emission circulate around the magnetic axis due to the E × B drift of spark plasma filaments, provides a natural and plausible physical mechanism of the subpulse drift phenomenon. Moreover, this is the only model with quantitative predictions that can be compared with observa- tions. Recent progress in the analysis of drifting subpulses in pulsars has provided a strong support to this model by revealing a number of subbeams circulating around the magnetic axis in a manner compatible with theoretical predictions. However, a more detailed analysis revealed that the circulation speed in a pure vacuum gap is too high when compared with observations. Moreover, some pul- sars demonstrate significant time variations of the drift rate, including a change of the apparent drift direction, which is obviously inconsistent with the E × B drift scenario in a pure vacuum gap. We attempted to resolve these discrepancies by considering a partial flow of iron ions from the positively charged polar cap, co- existing with the production of outflowing electron-positron plasmas. The model of such charge-depleted acceleration region is highly sensitive to both the critical ion temperature Ti � 10 6 K (above which ions flow freely with the corotational charge density) and the actual surface temperature Ts of the polar cap, heated by the bombardment of ultra-relativistic charged particles. By fitting the obser- vationally deduced drift-rates to the theoretical values, we managed to estimate polar cap surface temperatures in a number of pulsars. The estimated surface temperatures Ts correspond to a small charge depletion of the order of a few percent of the Goldreich-Julian corotational charge density. Nevertheless, the re-
Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/a8750dc09e63781906d4c1a8c286f5e4592d212b
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Citations in the corpus
- The subpulse modulation properties of pulsars at 21 cm (2005, background): “…well known is the sparking gap model (Ruderman & Sutherland 1975), which has been extended by many authors (e.g. Cheng & Ruderman 1980; Filippenko & Radhakrishnan 1982; Gil & Sendyk 2000; Gil et al. 2003; Qiao et al. 2004) making it the most developed model for explaining the drifting phenomenon.”
- A NICER View of PSR J0030+0451: Evidence for a Global-scale Multipolar Magnetic Field (2019, background): “…theoretical evidence for higher-order multipole moments being present close to the stellar surface for the rotation-powered NSs (e.g., Jones 1980; Gil et al. 2003; Arumugasamy et al. 2018), but multipole components are assumed to be much weaker than the Corresponding author: A. V. Bilous…”
- Magnetic field dissipation in neutron star crusts: From magnetars to isolated neutron stars (2007, background): “In addition, the growing understanding of the physics of the drifting sub-pulses supports the idea that small scale crustal field structures must be present (Gil et al. 2003, 2006).”