The topology and polarization of sub-beams associated with the 'drifting' sub-pulse emission of pulsar B0943+10 - II. Analysis of Gauribidanur 35-MHzobservations

In the previous paper of this series, Deshpande & Rankin reported results r egarding the subpulse drift phenomenon in pulsar B0943 + 10 at 430 and 111 MHz. This study has led to the identification of a stable system of sub-bea ms circulating around the magnetic axis of this star. Here, we present a si ngle-pulse analysis of our observations of this pulsar at 35 MHz. The fluct uation properties seen at this low frequency, as well as our independent es timates of the number of sub-beams required and their circulation time, agr ee remarkably wen with the reported behaviour at higher frequencies. We use the 'cartographic' transform mapping technique developed by Deshpande & Ra nkin in Paper I to study the emission pattern in the polar region of this p ulsar. The significance of our results in the context of radio emission mec hanisms is also discussed.