2018
DOI: 10.1002/2017ja024972
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A Case Study of Connection Between Ground Magnetic Field Perturbations and Tail Current Sheet Bursty Flows at X = −60 RE

Abstract: We report the first observations that connect a burst of fast flows and Pi2 fluctuations in the midtail current sheet at X ~ −60 RE with ground magnetic negative bays and Pi2 pulsations at high latitudes near 70°. Both the flow burst and negative bays occurred around midnight and were isolated and lasted for ~10 min. The flow burst had the characteristics of a low‐density plasma bubble. It was moving earthward at ~340 km/s and was accompanied by field‐aligned currents. The timing and equatorward motion of magn… Show more

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Cited by 13 publications
(12 citation statements)
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“…Pi2 pulsations and small ground magnetic field perturbations were, however, seen at high and low latitudes before initial brightening ( Figures S5-S8). Although they were away from THEMIS B and C's footprints, they may potentially be related to the fast earthward flows in the magnetotail, see Wang et al (2018), although their events were observed at X ∼ −60 R E . Figure 3 shows data from THEMIS D, which was located in the plasma sheet at (X, Y) ∼ (−10.5, 4.4) R E .…”
Section: Magnetotailsupporting
confidence: 84%
“…Pi2 pulsations and small ground magnetic field perturbations were, however, seen at high and low latitudes before initial brightening ( Figures S5-S8). Although they were away from THEMIS B and C's footprints, they may potentially be related to the fast earthward flows in the magnetotail, see Wang et al (2018), although their events were observed at X ∼ −60 R E . Figure 3 shows data from THEMIS D, which was located in the plasma sheet at (X, Y) ∼ (−10.5, 4.4) R E .…”
Section: Magnetotailsupporting
confidence: 84%
“…These flows are related to the narrow inverted-V electron precipitations in Figure 3aiv and the ion precipitation gaps in Figure 3av. The flows are likely associated with auroral streamers (Gallardo-Lacourt et al, 2014;Sergeev et al, 2004), ionospheric footprints of bursty bulk flows (Angelopoulos et al, 1992(Angelopoulos et al, , 1994 carried by dipolarizing flux bundles (DFBs; Liu et al, 2014) in the magnetotail (e.g., Nakamura et al, 2001;Wang, Xing, et al, 2018).…”
Section: Dawn Sector Eventmentioning
confidence: 99%
“…Thus, the magnetic perturbations were localized near Fort Simpson and Fort Smith. Localized perturbations are usually associated with an auroral streamer (e.g., Lyons et al, 2012), the footprint of a BBF channel in the plasma sheet (e.g., Nakamura et al, 2001; Wang, Xing, et al, 2018). Around the time of the significant magnetic perturbation, a bright aurora form appears poleward of the main bright arc.…”
Section: Case Studiesmentioning
confidence: 99%