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Earth, Planets and Space
Fig. 4 | Earth, Planets and Space

Fig. 4

From: The ionospheric condition and GPS positioning performance during the 2013 tropical cyclone Usagi event in the Hong Kong region

Fig. 4

The indices of Kp (a), Dst (b), and F10.7 (c) during the period from 13 September to 12 October 2013. The period from 16 to 24 September represented as a gray background area between two vertical dashed lines is the life cycle of the Usagi. The red solid horizontal lines denote the mean value of the indices. The red solid vertical line denotes the TC’s landfall near Hong Kong on 22 September 2013

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