- Conference date: 12–17 August 2007
- Location: Montreal (Canada)
“Sub‐pulse drifting”, one of the rich phenomena exhibited by many pulsars, have been suggested (, Ruderman and Sutherland, hereafter RS) as representing a system of sparks circulating around the magnetic axis in the acceleration zone of the star. Although pulse ‘drift’ sequences have been studied for a number of pulsars, only in a few cases (i.e, B0943+10 & B0834+06) have the underlying patterns been mapped so far, revealing a well organized system of emission sub‐beams and providing a strong support to the R&S model of circulating sparks. The well‐known bright pulsar B1237+25, with its multi‐component profile resulting from a special viewing geometry combined with its rich variety in pulse‐to‐pulse fluctuations, represents a challenging case for exploring the underlying circulation pattern. We present preliminary results of our analysis on a number of pulse‐sequences from this object, with a view to investigate the following:
1. Are the sub‐beam patterns in the two presumed conal rings correlated?
2. If yes, are the corresponding sub‐beam patterns in the two conal rings offset relative to each other in magnetic azimuth?
3. Can the mode‐changing phenomenon be understood as a result of some systematic feature in sub‐beam patterns?
4. Core component: Really a “core” or just another conal ring of suitably small radius?
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