On the spatial relationship between auroral emissions and magnetic signatures of plasma convection in the midday polar cusp and cap ionospheres during negative and positive IMF Bz: A case study

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Abstract
The dynamics of midday auroras, including polar cusp and cap emissions, and their relation to the interplanetary magnetic field (IMF) have been investigated with optical ground‐based observations from Svalbard (75° geomagnetic latitude), Norway, and IMF data from spacecraft ISEE 2. One case is presented, showing the spatial relationship—along the magnetic meridian in the midday sector—between the cusp aurora and IMF By‐related convection currents (the DPY signature) for negative and positive values of IMF Bz.