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Earth, Planets and Space
Fig. 9 | Earth, Planets and Space

Fig. 9

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

Fig. 9

Daily STD of the TECR (unit: TECU/s) for the HKOH (red line with stars), HKPC (green line with triangles), and HKST (blue line with squares) stations during the period from 14 September to 12 October 2013. The STD of TECR is calculated from the TECR of all the GPS satellites in a particular day. 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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