Hassall, T. EStappers, B. W.Weltevrede, PHessels, J. W. T.Alexov, ACoenen, TKarastergiou, AKramer, MKeane, E. F.Kondratiev, V. I.van Leeuwen, JNoutsos, APilia, MSerylak, MSobey, CZagkouris, KFender, RBell, M. E.Broderick, JEislo-el, JFalcke, HGriebmeier, J MKuniyoshi, MMiller-Jones, J. C. A.Wise, M JWucknitz, OZarka, PAsgekar, ABatejat, FBentum, M JBernardi, GBest, PhillipBonafede, ABreitling, FBruggen, MButcher, HarveyCiardi, Benedettade Gasperin, Fde Reijer, J.-P.Duscha, S.Fallows, R. A.Ferrari, C.Frieswijk, W.Garrett, M. A.Gunst, A. W.Heald, G.Hoeft, M.Juette, E.Maat, P.McKean, J. P.Norden, M. J.Pandey-Pommier, M.Pizzo, R.Polatidis, A. G.Reich, W.Rottgering, HubbSluman, J.Tang, T.Tasse, C.Vermeulen, R. C.van Weeren, R. J.Wijnholds, S. J.Yatawatta, S.Tang, Y2015-12-130004-6361http://hdl.handle.net/1885/72407Some radio pulsars show clear "drifting subpulses", in which subpulses are seen to drift in pulse longitude in a systematic pattern. Here we examine how the drifting subpulses of PSR B0809+74 evolve with time and observing frequency. We show that the subpAuthor/s retain copyrightKeywords: Frequency dependence; Frequency-dependent; Higher frequencies; Pulsar magnetosphere; Pulsars: general; Pulsars: individuals; Rotating carousel; Surface oscillations; Astronomy; Astrophysics; Telescopes; Plasma theory Pulsars: general; Pulsars: individual: PSR B0809+74; Telescopes201310.1051/0004-6361/2012207642016-02-24