Figure 1
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Observational bias of Earthward BBFs events related to the MMS tail/summer season. (a) Dipole tilt angle at the moment of the 2135 BBF event, chronologically ordered. The dashed red lines correspond to the dates of the first BBF detected during each MMS tail summer season: 2017-05-16, 2018-05-30, 2019-06-18, 2020-06-27, and 2021-06-26. (b, c) BBF position in GSM coordinates for the BBF event detected during the second MMS tail season (red and blue dots) and when 20° < Ψ < 30, (blue dots). The background magnetic field lines are produced with T89 for Ψ = 25°, Kp = 1, Vx,GSE = −400 km/s.
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