globalchange  > 科学计划与规划
DOI: 10.1002/2016GL068768
Transient, small-scale field-aligned currents in the plasma sheet boundary layer during storm time substorms
Author: Nakamura R.; Sergeev V.A.; Baumjohann W.; Plaschke F.; Magnes W.; Fischer D.; Varsani A.; Schmid D.; Nakamura T.K.M.; Russell C.T.; Strangeway R.J.; Leinweber H.K.; Le G.; Bromund K.R.; Pollock C.J.; Giles B.L.; Dorelli J.C.; Gershman D.J.; Paterson W.; Avanov L.A.; Fuselier S.A.; Genestreti K.; Burch J.L.; Torbert R.B.; Chutter M.; Argall M.R.; Anderson B.J.; Lindqvist P.-A.; Marklund G.T.; Khotyaintsev Y.V.; Mauk B.H.; Cohen I.J.; Baker D.N.; Jaynes A.N.; Ergun R.E.; Singer H.J.; Slavin J.A.; Kepko E.L.; Moore T.E.; Lavraud B.; Coffey V.; Saito Y.
Source Publication: Geophysical Research Letters
ISSN: 0094-9571
EISSN: 1944-9302
Publishing Year: 2016
Volume: 43, Issue:10
pages begin: 4841
pages end: 4849
Language: 英语
Keyword: electron beam ; field-aligned currents ; MMS ; PSBL
Scopus Keyword: Electron beams ; Fighter aircraft ; Ion beams ; Magnetic flux ; Magnetosphere ; Plasma flow ; Plasma sheaths ; Field aligned currents ; Field-aligned electrons ; Intense field ; Magnetospheric multi scale ; Magnetotail reconnection ; Multiscale process ; Plasma sheet boundary layer ; PSBL ; Boundary layers ; acceleration ; boundary layer ; current ; electron ; magnetotail ; plasma ; spacecraft ; storm
English Abstract: We report on field-aligned current observations by the four Magnetospheric Multiscale (MMS) spacecraft near the plasma sheet boundary layer (PSBL) during two major substorms on 23 June 2015. Small-scale field-aligned currents were found embedded in fluctuating PSBL flux tubes near the separatrix region. We resolve, for the first time, short-lived earthward (downward) intense field-aligned current sheets with thicknesses of a few tens of kilometers, which are well below the ion scale, on flux tubes moving equatorward/earthward during outward plasma sheet expansion. They coincide with upward field-aligned electron beams with energies of a few hundred eV. These electrons are most likely due to acceleration associated with a reconnection jet or high-energy ion beam-produced disturbances. The observations highlight coupling of multiscale processes in PSBL as a consequence of magnetotail reconnection. ©2016. The Authors.
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Document Type: 期刊论文
Appears in Collections:科学计划与规划

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Affiliation: Space Research Institute, Austrian Academy of Sciences, Graz, Austria

Recommended Citation:
Nakamura R.,Sergeev V.A.,Baumjohann W.,et al. Transient, small-scale field-aligned currents in the plasma sheet boundary layer during storm time substorms[J]. Geophysical Research Letters,2016-01-01,43(10).
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