Fig. 12From: Relationship between the low-latitude coronal hole area, solar wind velocity, and geomagnetic activity during solar cycles 23 and 24The variation of SYM-H index for IMF cases for solar cycle 23 (black line) and for cycle 24 (red line). The vertical light blue line represents the start time of an enhancement of solar wind velocity around the Earth’s orbit. The error bar represents the standard deviationBack to article page