A study of the CDAW 9C substorm of May 3, 1986, using magnetograrn inversion technique 2, and a substorm scenario with two active phases

Мишин, В. М.; Block, L. P.; Bazarzhapov, A. D.; Saifudinova, T. I.; Lunyushkin, S. B.; Shirapov, D. Sh.; Woch, J.; Eliasson, L.; Marklund, Göran; Blomberg, Lars G.; Opgenoorth, H. J.

doi:10.1029/97ja00154

Cited by 24 publications

(16 citation statements)

References 43 publications

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“…It has been recognized that in many substorm events, midtail reconnection develops in two steps: first, plasma sheet reconnection of closed field lines (PSR) and second, tail lobe reconnection of open field lines (TLR). In accordance, the overall substorm phenomena occur in two distinct ways associated with the different topologies of reconnection [ Baker et al , 2002; Mishin et al , 1997, 2001; Pu et al , 2006]. During the period of PSR, if reconnection at the dayside magnetopause continues and transports more flux to the magnetotail than that distant reconnection releases, Ψ will keep increasing.…”

Section: Discussionmentioning

confidence: 99%

Multispacecraft and ground‐based observations of substorm timing and activations: Two case studies

Cao

Zhang

et al. 2008

J. Geophys. Res.

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[1] Two case studies are performed to investigate substorm timing and activations based on Double Star TC1, Cluster, Polar, IMAGE, LANL geostationary satellites and ground-based geomagnetic field measurements. In both events, an earthward flow associated with plasma sheet thinning is measured by Cluster 8-10 min ahead of the auroral breakup. A couple of minutes after the breakup, either TC1 at $X-10 R E first detects plasma sheet expansion and then the LANL satellites near the midnight measure energetic electron injections at geostationary orbit or the LANL satellites first measure the electron injections and then TC1 detects the plasma sheet expansion. More than about 20 min later, Cluster at X$16 R E and Polar (at higher latitude) successively observe plasma sheet expansion. The open magnetic flux of the polar cap, Y, is found to continually increase during the early substorm phase and then to rapidly fall when the IMF turns northward. When Y reaches its minimum value, bright and broad auroral activities start to decrease. Tailward progression of the magnetic dipolarization and a poleward expansion of auroral bulges are shown to closely map to one another. These results suggest that substorm activations start in the midtail before ground onset and then move earthward, which leads to an expansion onset in the near-Earth tail around X$ -(8-9) R E . After onset, the activations progress both earthward and tailward. Substorm onset is possibly related to plasma sheet reconnection of close field lines, while tail lobe reconnection of open field lines release more energy to support the full expansion of the substorm. In a fully developed expansion phase, an initial dipolarization in the near-Earth may eventually evolve to enable disruption of the cross-tail current over a wide region of the magnetotail. Citation: Cao, X., et al. (2008), Multispacecraft and ground-based observations of substorm timing and activations: Two case studies,

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Section: Discussionmentioning

confidence: 99%

Multispacecraft and ground‐based observations of substorm timing and activations: Two case studies

Cao

Zhang

et al. 2008

J. Geophys. Res.

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“…This is a scenario similar to that "with two active phases and the tail-stretching feedback." In this scenario (see Mishin et al [ 1997] for more detail) the first active phase of a typical substorm is the phase of loading onsets produced by instabilities in the innermost current sheet, which do not involve the open tail reconnection but do involve a chain of processes created by the tail stretching with positive feedback between the solar wind-magnetosphere dynamo and the magnetosphere itself. The ionosphere does not play a crucial role in the transition from the regime of loading onsets to the expansion phase, although it can influence the intensity of the loading onset itself.…”

Section: Discussionmentioning

confidence: 99%

Study of weak substorms observed during December 8, 1990, Geospace Environment Modeling campaign: Timing of different types of substorm onsets

Мишин¹,

Russell²,

Saifudinova³

et al. 2000

J. Geophys. Res.

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“…Baker et al, 1997;Pinnock and Rodger, 2001;Grocott et al, 2002;Milan et al, 2003, Chisham et al, 2004 then the open flux content of the magnetosphere can be quantified, from which it is possible to deduce the reconnection rates (e.g. Taylor et al, 1996;Mishin et al, 1997;Milan et al, 2003Milan et al, , 2004Milan et al, , 2005bMilan, 2004b). It is the purpose of the present paper to review how such measurements are made and describe our current understanding of the dynamics of the system.…”

Section: Introductionmentioning

confidence: 99%

Space- and ground-based investigations of solar wind–magnetosphere–ionosphere coupling

Milan

Wild

Grocott

et al. 2006

Advances in Space Research

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Abstract.This paper provides a brief review of the understanding of the coupled solar windmagnetosphere-ionosphere system that can be attained from observations of the size of the ionospheric polar caps from space and the ground. These measurements allow the occurrence and rate of dayside and nightside reconnection to be deduced. The former can be correlated with upstream interplanetary magnetic field observations to give an estimate of the effective length of the dayside reconnection X-line. The latter allows a preliminary statistical study of flux closure during substorms and other, smaller nightside reconnection events.

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A study of the CDAW 9C substorm of May 3, 1986, using magnetograrn inversion technique 2, and a substorm scenario with two active phases

Cited by 24 publications

References 43 publications

Multispacecraft and ground‐based observations of substorm timing and activations: Two case studies

Multispacecraft and ground‐based observations of substorm timing and activations: Two case studies

Study of weak substorms observed during December 8, 1990, Geospace Environment Modeling campaign: Timing of different types of substorm onsets

Space- and ground-based investigations of solar wind–magnetosphere–ionosphere coupling

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