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

Fig. 1

From: Improving estimates of the ionosphere during geomagnetic storm conditions through assimilation of thermospheric mass density

Fig. 1

St. Patrick’s Day storm 2015. a geomagnetic activity represented by the Dst (red) and 3-h average Kp (blue) indices. b Along the orbit thermospheric mass density observations from Swarm-A, -B, and -C satellites (yellow, blue, and black) normalized to 400 km altitude. The period from 16 to 18 March 2015 includes a pre-storm quiet day, the main phase of the storm and the first day of the recovery phase. A strong perturbation in geomagnetic activity and neutral density is visible during the main phase of the storm

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