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Earth, Planets and Space
Fig. 6 | Earth, Planets and Space

Fig. 6

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

Fig. 6

Number of S4 > 0.3 calculated from the ionospheric scintillation monitoring station during the period from 14 September to 12 October 2013. The life cycle of the Usagi was from 16 to 24 September 2013, as represented by the gray background area between two vertical red dashed lines. The vertical red solid line denotes the TC’s landfall near Hong Kong on 22 September 2013

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