Plasmoid ejection and auroral brightenings

Ieda, A.; Fairfield, D. H.; Mukai, T.; Saito, Y.; Kokubun, S.; Liou, K.; Meng, C.‐I.; Parks, G. K.; Brittnacher, M.

doi:10.1029/1999ja000451

Cited by 86 publications

(118 citation statements)

References 29 publications

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“…Not only was a close temporal-spatial relationship found for auroras and isolated BBF events (including both tailward flow bursts corresponding to the plasmoids, Ieda et al, 2001 and earthward flows near the center of an expanded plasma sheet, Nakamura et al, 2001a, b), but the absence of perpendicular (cross-B) plasma flows in the plasma sheet in the absence of the auroral activations was also shown (Ieda et al, 2003). This close relationship suggests the attractive possibility of using the auroral activations as a tool for monitoring the high-speed plasma sheet flows if their spatial relationship and the mechanism generating the precipitation can be established.…”

Section: Introductionmentioning

confidence: 86%

“…Recently, a close relationship between the fast bursty plasma sheet flows (BBFs) and auroral activations was confirmed observationally for a wide range of activity and for different types of transient auroral structures, including the localized auroral brightenings and pseudobreakups, and north-south auroras (or auroral streamers) (Fairfield et al, 1999;Ieda et al, 2001;Nakamura et al, 2001b;Sergeev et al, , 2001Lyons et al, 1999). Not only was a close temporal-spatial relationship found for auroras and isolated BBF events (including both tailward flow bursts corresponding to the plasmoids, Ieda et al, 2001 and earthward flows near the center of an expanded plasma sheet, Nakamura et al, 2001a, b), but the absence of perpendicular (cross-B) plasma flows in the plasma sheet in the absence of the auroral activations was also shown (Ieda et al, 2003).…”

Section: Introductionmentioning

confidence: 91%

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Auroral streamers: characteristics of associated precipitation,convection and field-aligned currents

et al. 2004

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Abstract. During the long-duration steady convection activity on 11 December 1998, the development of a few dozen auroral streamers was monitored by Polar UVI instrument in the dark northern nightside ionosphere. On many occasions the DMSP spacecraft crossed the streamer-conjugate regions over the sunlit southern auroral oval, permitting the investigation of the characteristics of ion and electron precipitation, ionospheric convection and field-aligned currents associated with the streamers. We confirm the conjugacy of streamer-associated precipitation, as well as their association with ionospheric plasma streams having a substantial equatorward convection component. The observations display two basic types of streamer-associated precipitation. In its polewardmost half, the streamer-associated (field-aligned) accelerated electron precipitation coincides with the strong (≥ 2−7µ A/m 2 ) upward field-aligned currents on the westward flank of the convection stream, sometimes accompanied by enhanced proton precipitation in the adjacent region. In the equatorward portion of the streamer, the enhanced precipitation includes both electrons and protons, often without indication of field-aligned acceleration. Most of these characteristics are consistent with the model describing the generation of the streamer by the narrow plasma bubbles (bursty bulk flows) which are contained on dipolarized field lines in the plasma sheet, although the mapping is strongly distorted which makes it difficult to quantitatively interprete the ionospheric image. The convective streams in the ionosphere, when well-resolved, had the maximal convection speeds ∼0.5-1 km/s, total field-aligned currents of a few tenths of MA, thicknesses of a few hundreds km and a potential drop of a few kV across the stream. However, this might represent only a small part of the associated flux transport in the equatorial plasma sheet.Correspondence to: V. Sergeev (victor@geo.phys.spbu.ru)

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Section: Introductionmentioning

confidence: 86%

Section: Introductionmentioning

confidence: 91%

Auroral streamers: characteristics of associated precipitation,convection and field-aligned currents

et al. 2004

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“…The time relationship between plasmoids and auroral pseudo-breakups was studied by Ieda et al (2001). They found that the earliest plasmoid was observed at X=−28 R E about 2 min before the auroral brightening.…”

Section: ∼5mentioning

confidence: 99%

“…Runov et al: Tailward flows in the near-Earth magnetotail Plasmoid-related tailward flows were found to be almost always associated with auroral breakups or pseudo-breakups (Ieda et al, 2001;Nakamura et al, 2001).…”

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confidence: 99%

Structure of the near-Earth plasma sheet during tailward flows

et al. 2008

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Abstract.A detailed analysis of successive tailward flow bursts in the near-Earth magnetotail (X∼−19 R E ) plasma sheet is performed on the basis of in-situ multi-point observations by the Cluster spacecraft on 15 September 2001. The tailward flows were detected during a northward IMF interval, 2.5 h after a substorm expansion. Each flow burst (V x <300 km/s) was associated with local auroral activation. Enhancements of the parallel and anti-parallel ∼1 keV electron flux were detected during the flows. The spacecraft configuration enables to monitor the neutral sheet (B x ≈0) and the level of B x ≈10-15 nT simultaneously, giving a possibility to distinguish between closed plasmoid-like structures and open NFTE-like surges. The data analysis shows NFTElike structures and localized current filaments embedded into the tailward plasma flow. 3-D shapes of the structures were reconstructed using the four-point magnetic filed measurements and the particle data.

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“…The lobe reconnection X-line substantially evolved tailward. Ieda et al (2001) studied brightenings in the polar ionosphere when plasmoids were observed in midtail. They found that the brightenings are closely related with the formation of plasmoids.…”

Section: Discussionmentioning

confidence: 99%

On the retreat of near-Earth neutral line during substorm expansion phase: a THEMIS case study during the 9 January 2008 substorm

Cao

et al. 2012

Ann. Geophys.

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Abstract. The location of magnetic reconnection in the midtail during a substorm was studied in many researches. Here we present multi-point THEMIS observations of a reconnection event in the near-Earth magnetotail during substorm. In this event, THEMIS probes stayed in the near-Earth and midtail region aligning along the magnetotail. This allows reconnection evolution to be probed simultaneously from about −10 R E to −23 R E down tail. The Hall current related electron streams were observed at the same time by two probes far away from the reconnection site. Before near-Earth reconnection involved the tail lobe magnetic field, the reconnection site was restricted in earthward −23 R E . When reconnection involved into the tail lobe region, the reconnection site started to retreat gradually.

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Plasmoid ejection and auroral brightenings

Cited by 86 publications

References 29 publications

Auroral streamers: characteristics of associated precipitation,convection and field-aligned currents

Auroral streamers: characteristics of associated precipitation,convection and field-aligned currents

Structure of the near-Earth plasma sheet during tailward flows

On the retreat of near-Earth neutral line during substorm expansion phase: a THEMIS case study during the 9 January 2008 substorm

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