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

Fig. 6

From: Relationship between the low-latitude coronal hole area, solar wind velocity, and geomagnetic activity during solar cycles 23 and 24

Fig. 6

Temporal variations of 12-h average CH area in the four latitudinal ranges for 13 days. The black and red lines correspond to the CH areas of solar cycle 23 (1996–2008) and 24 (2009–2016), respectively. The vertical light blue line represents the start time of an enhancement of solar wind velocity around the Earth’s orbit. The left labels “Area a,” “Area b,” “Area c,” and “Area d” in each panel show the regions of (30–60, − 30 to 30), (0–30, − 30 to 30), (− 30 to 0, − 30 to 30), and (− 60 to 30, − 30 to 30) degrees in the solar latitude and longitude, respectively

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