The topology and polarization of subbeams associated with drifting subpulse emission of pulsar B0943+10 - VI. Analysis of an 8-hour GMRT observation

Abstract

We report analysis of an 8 hr observation of PSR B0943+10 at 325 MHz performed at the Giant Metrewave Radio Telescope (GMRT) in India. B0943+10 is well known for displaying regular sub-pulse drifting and two emission modes. We investigate the modal behavior of B0943+10. By reconstructing an entire 'B' mode from two consecutive 'B' modes, we estimate that the pulsar spends roughly 7.5 hrs in the 'B' mode and about 2.2 hrs in the 'Q' mode, on average. Although the pulsar can switch modes within one pulse, the sub-pulse drift rate changes with a characteristic time of 1.2 hrs over the course of a 'B' mode. Under the subbeam carousel model we find the drift-rate changes are produced by a 10% increase in the average number of subbeams and a 16% increase in the carousel circulation time. We speculate that under the partially screened gap model the increase in circulation time should be related to a small increase in the neutron star surface temperature.

10 Pages, 10 Figures

References in corpus (7)

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• Unraveling the drift behaviour of the remarkable pulsar PSR B0826-34
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• Differential Frequency-dependent Delay from the Pulsar Magnetosphere
• Rapid Modification of Neutron Star Surface Magnetic Field: A proposed mechanism for explaining Radio Emission State Changes in Pulsars
• LOFAR observations of PSR B0943+10: profile evolution and discovery of a systematically changing profile delay in Bright mode
• Radio emission features in different modes of PSR J0826+2637 (B0823+26)
• Pulsar bi-drifting: implications for polar cap geometry
• B0943+10: low-frequency study of subpulse periodicity in the Bright mode with LOFAR
• PSR B0943+10: Mode Switch, Polar Cap Geometry, and Orthogonally Polarized Radiation
• The radio and X-ray mode-switching pulsar PSR B0943+10
• The Discovery of Transitive Phenomenon in the Radio Emission of the mode-switcher PSR B0943+10