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Earth, Planets and Space
Fig. 10 | Earth, Planets and Space

Fig. 10

From: Improving the estimation of thermospheric neutral density via two-step assimilation of in situ neutral density into a numerical model

Fig. 10

Each map corresponds to a pressure level of the state grid. The difference between the forecast mean and analysis mean of the neutral density \(\left( \frac{\text {g}}{\text {cm}^3}\right)\) is indicated by the color bars on the right. Each row corresponds to a pressure level. each column to an analysis step. This figure shows the three first analysis steps. The horizontal position of CHAMP is marked with a black star, the position of the Sun with an orange circle, and the day–night border with an orange line

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