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We report on the unexpected detection of considerable structure in high latitude thermospheric densities, as derived from an accelerometer onboard the CHAMP satellite. The width of the structures, which can either be maxima or minima, varies between a few hundred km and 2000 km. The amplitudes of these density extrema can reach 50% of ambient. Maxima cluster around 75 • (N and S), while minima are found closer to the poles. In a magnetic latitudemagnetic local time frame the maxima are founddoi:10.5194/angeo-23-1659-2005 fatcat:i6pgajyb5vgyzlynzhzj4c6iti