Solar wind-magnetosphere interaction as observed in the geomagnetic field variations in the polar regions

Relative few ULF measurements at extreme latitudes have been achieved so far. We review the results obtained in the last few years in the Pc3-5 range at cusp/cap latitudes, and present new results obtained from comparisons of the experimental observations at polar cap stations with those obtained at low latitudes. The experimental observations performed during a short term campaign at the new polar station Concordia (CGM latitude approximate to 89 degrees) are also presented.