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Earth, Planets and Space
Fig. 1 | Earth, Planets and Space

Fig. 1

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

Fig. 1

The variations of the solar wind proton density and flow speed provided by CDAweb from February 27 to March 12, 2005. The time resolution is 1 min. a The variation of the solar wind density, b the variation of the solar wind flow speed. c, d Represents the half day moving average and the first derivative of the speed. The vertical light blue line represents the day of the maximum value of the solar wind density and the enhancement of the solar wind velocity around the Earth’s orbit

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