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Radio pulsar PSR B1946+35 is a classical example of a core/cone triple pulsarwhere the observer's line-of-sight cuts the emission beam centrally. In thispaper we perform a detailed single-pulse polarimetric analysis of B1946+35using sensitive Arecibo archival and new observations at 1.4 and 4.6 GHz tore-establish the pulsar's classification wherein a pair of inner conal"outriders" surround a central core component. The new 1.4 GHz observationconsisted of a long single pulse sequence of 6678 pulses, and its fluctuationspectral analysis revealed that the pulsar shows a time-varying amplitudemodulation, where for a thousand periods or so the spectra have a broad lowfrequency "red" excess and then at intervals they suddenly exhibit highlyperiodic longitude-stationary modulation of both the core and conal componentsfor several hundred periods. The fluctuations of the leading conal and the corecomponents are in phase, while those in the trailing conal component incounterphase. These fluctuation properties are consistant with shorter pulsesequence analyses reported in an earlier study by Weltevrede et al. (2006,2007) as well as in our shorter pulse sequence data sets. We argue that thisdual modulation of core and conal emission cannot be understood by a modelwhere subpulse modulation is associated with the plasma {\bf E}$\times${\bf B}drift phenomenon. Rather the effect appears to represent a kind of periodicemission-pattern change over timescales of $\sim$18 s (or 25 pulsar periods),which has not been reported previously for any other pulsar.

Periodic Longitude-Stationary Non-Drift Emission in Core-Single Radio Pulsar B1946+35