Fig. 9.
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GRACE (top) and GOCE (bottom) neutral densities scaled to fixed altitudes of 470 km (GRACE) and 275 km (GOCE) during the August 2011 magnetic storm which began at Day of Year (DOY) 217.8. The magnetic latitudes of both spacecraft are shown in red. The largest density maxima measured during the storm occur at the highest latitudes throughout the main phase.
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