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Earth, Planets and Space
Fig. 4 | Earth, Planets and Space

Fig. 4

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

Fig. 4

The geomagnetic activity variations in the trough depth (upper panel (a)), background TEC (middle panel (b)), and TEC value at the trough minimum position (lower panel (c)) during equinox. The data correspond to the near-midnight region (2300–0100 MLT) and median solar activity (100 ≤ F107 ≤ 115). The red solid lines show the linear fit of the data. The correlation coefficients (c.c.) and the linear regression equations are also shown in the figure

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