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Magnetotail earthward fast flow bursts can transport most magnetic flux and energy into the inner magnetosphere. These fast flow bursts
are generally an order of magnitude higher than the typical convection speeds that are azimuthally localised (1–3 RE) and are flanked by
plasma vortices, which map to ionospheric plasma vortices of the same sense of rotation. This study uses a multipoint analysis of conjugate
magnetospheric and ionospheric observations to investigate the magnetospheric and ionospheric responses to fast flow bursts that are associated
with both substorms and pseudobreakups. We study in detail what properties control the differences in the magnetosphere–ionosphere responses between
substorm fast flow bursts and pseudobreakup events, and how these differences lead to different ionospheric responses. The fast flow bursts and
pseudobreakup events were observed by the Time History of Events and Macroscale Interaction during Substorms (THEMIS), while the primary ionospheric
observations were made by all-sky cameras and magnetometer-based equivalent ionospheric currents. These events were selected when the satellites
were at least 6 RE from the Earth in radial distance and a magnetic local time (MLT) region of ± 5 h from local midnight. The
results show that the magnetosphere and ionosphere responses to substorm fast flow bursts are much stronger and more structured compared to
pseudobreakups, which are more likely to be localised, transient and weak in the magnetosphere. The magnetic flux in the tail is much stronger for
strong substorms and much weaker for pseudobreakup events. The Blobe decreases significantly for substorm fast flow bursts compared to
pseudobreakup events. The curvature force density for pseudobreakups are much smaller than substorm fast flow events, indicating that the
pseudobreakups may not be able to penetrate deep into the inner magnetosphere. This association can help us study the properties and activity of the
magnetospheric earthward flow vortices from ground data.