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The most important parameter in the coupling between solar wind and geomagnetic activity is the  B   z  ‐component of the interplanetary magnetic field (IMF). However, recent studies have shown that IMF  B   y   is an additional, independent driver of geomagnetic activity. We use here local geomagnetic indices from a large network of magnetic stations to study how IMF  B   y   affects geomagnetic activity at different latitudes for all solar wind and, separately, during coronal mass ejections. We show that geomagnetic activity, for all solar wind, is 20% stronger for  B   y   > 0 than for  B   y   < 0 at subauroral latitudes of about 60° corrected geomagnetic latitude. During coronal mass ejections, the  B   y  ‐effect is larger, about 40%, at slightly lower latitudes of about 57° (corrected geomagnetic) latitude. These results highlight the importance of the IMF  B   y  ‐component for space weather at different latitudes and must be taken into account in space weather modeling.

Explicit IMF B y ‐Effect Maximizes at Subauroral Latitudes (Dedicated to the Memory of Eigil Friis‐Christensen)