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<p><strong>Abstract.</strong> We employ JRA-55, a recent second-generation global reanalysis providing data of high-quality in the stratosphere, to examine whether a distinguishable effect of geomagnetic activity on northern hemisphere stratospheric temperatures can be detected. We focus on how the statistical significance of stratospheric temperature differences may be robustly assessed during years with high and low geomagnetic activity. Two problems must be overcome. Thedoi:10.5194/angeo-2019-156 fatcat:qame465burgo5nev2bsj5kkiau