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Global distribution of the thermospheric mass density variation at 400 km altitude as obtained from the real-time GAIA simulation. The values of (storm-quiet)/quiet in % are shown for 00:00 UT (before the second magnetic storm) and 21:00 UT (during the second magnetic storm) on February 4, 2022, in the upper and bottom panels, respectively. The selected quiet day is February 1, 2022.
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