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

Fig. 1

From: Assessing the performance of a Northeast Asia Japan-centered 3-D ionosphere specification technique during the 2015 St. Patrick’s day geomagnetic storm

Fig. 1

Image obtained from the works of Ssessanga et al. 2021: a network of GNSS receivers (blue asterisks) and ionosonde stations (solid red stars) used in the analysis. Horizontal boundaries of the different sub-grid regions that compose the overall grid used in computation are marked by solid dashed lines. The sub-grid resolution decreases with increasing distance away from the dense network

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