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Earth, Planets and Space
Fig. 1 | Earth, Planets and Space

Fig. 1

From: Calibration and assessment of Swarm ion drift measurements using a comparison with a statistical convection model

Fig. 1

Distribution of Swarm A satellite footprints. a Distribution of the coordinates of the satellite track for the Swarm A satellite for all available passes May–September 2014. Number of measurements (occurrence) is indicated by color using a uniformly distributed grid of equal area cells in the high-latitude (>50° MLAT) region of the northern hemisphere in MLAT/MLT coordinates. Each grid cell has a length equivalent to 1° of MLAT. b Same as (a), but for a subset of 70 passes for periods of quasi-stable IMF and solar wind. Data are limited to the convection zone, determined by finding the intersection of the footprints of the satellite orbit with the Heppner–Maynard Boundary (HMB) corresponding to the Cousins and Shepherd (2010) statistical model for that period (see descriptions in “Statistical convection model” section)

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