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We studied dayside magnetic disturbances, that were registered at the high-latitudes when the Interplanetary Magnetic Field (IMF) was northward (the IMF Bz > 0) and the IMF By dominated over the IMF Bz (|By|/|Bz| > 1). We investigated the high-latitude daytime magnetic bays observed on 04 August 2010 and 22 January 2012. Our study was based on the ground-based IMAGE magnetometer data; IMF OMNI one-minute data; vector distributions of the geomagnetic field measured by ground-based magnetometers and provided by the AMPERE project; maps of field-aligned currents (FACs) intensity from the AMPERE project, and ionospheric convection patterns from SuperDARN. It was shown that under the positive IMF Bz and |By|/|Bz| > 1, the sign of the dayside polar magnetic bays is controlled by the IMF By sign. We suppose that the studied dayside high latitude bays could be caused by enhancement of the NBZ system of FACs. © 2019 BBSCS RN SWS. All rights reserved

Response of the High-latitude Daytime Magnetic Bays to the IMF By: Case study