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Table 3 Results of trend tests and regression analyses for the residual Sq amplitude obtained at six geomagnetic stations

From: Long-term variation in the upper atmosphere as seen in the geomagnetic solar quiet daily variation

Station name Trend test Slope of linear regression [nT/year] Standard error of the slope [nT/year]
Addis Ababa Decrease −0.125 0.084
Trivandrum Decrease −0.197 0.145
Kakioka Decrease −0.061 0.025
San Juan No trend 0.001 0.012
Chambon-La-Foret Decrease −0.216 0.035
Niemegk Decrease −0.120 0.037