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Earth, Planets and Space
Fig. 3 | Earth, Planets and Space

Fig. 3

From: Statistical analysis of ionospheric mid-latitude trough over the Northern Hemisphere derived from GPS total electron content data

Fig. 3

The trough minimum position versus the daily Kp index during equinox. The data correspond to the near-midnight region (2300–0100 MLT) and median solar activity (100 ≤ F107 ≤ 115). The red solid line shows the linear fit of the data. The correlation coefficient (c.c.) and the linear regression equation are also shown in the figure

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