Fig. 3
From: Status of CAS global ionospheric maps after the maximum of solar cycle 24
Global TEC maps produced from Jason-2 and CAS final GIM data as well as their difference maps in the geographic latitude and local time coordinate system. The TEC maps are in the unit of TECu, and the difference maps are in percentage (%) compared to the Jason-2 VTECs. Three seasonal cases are presented from left to right: equinox, December and June solstices of the year 2016