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Electron density distributions of DMSP, tomography and background in terms of local time and days of year. White line indicates the beginning of the corresponding storm. DMSP-18 was selected for years 2013 and 2015 and DMSP-17 was selected for years 2017 and 2018. Color scale varies within each plot to adapt to a better visualization of the spatial distributions. Units of color bar are in log(Ne) with base 10.
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