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Intense late-cycle solar activity during October and November 2003 produced\udtwo strong geomagnetic storms: 28 October-5 November 2003 (October) and\ud19-23 November 2003 (November); both reached intense geomagnetic activity\udlevels, Kp=9, and Kp=8+, respectively. The October 2003\udgeomagnetic storm was stronger, but the effects on the Earth's ionosphere in\udthe mid-latitude European sector were more important during the November 2003\udstorm. The aim of this paper is to discuss two significant effects observed\udon the ionosphere over the mid-latitude European sector produced by the\udNovember 2003 geomagnetic storm, using data from ground ionosonde at Chilton\ud(51.5° N; 359.4° E), Pruhonice (50.0° N;\ud14.6° E) and El Arenosillo (37.1° N; 353.3° E),\udjointly with GPS data. These effects are the presence of well developed\udanomalous storm Es layers observed at latitudes as low as 37° N\udand the presence of two thin belts: one having enhanced electron content and\udother, depressed electron content. Both reside over the mid-latitude European\udevening sector

November 2003 event: effects on the Earth's ionosphere observed from ground-based ionosonde and GPS data