Thin Current Sheet Behind the Dipolarization Front

Standard

Thin Current Sheet Behind the Dipolarization Front. / Nakamura, R.; Baumjohann, W.; Nakamura, T. K.M.; Schmid, D.; Varsani, A.; Apatenkov, S.; Sergeev, V. A.; Birn, J.; Nagai, T.; Gabrielse, C.; André, M.; Burch, J. L.; Carr, C.; Dandouras, I. S.; Escoubet, C. P.; Fazakerley, A. N.; Giles, B. L.; Le Contel, O.; Russell, C. T.; Torbert, R. B.

In: journal of geophysical research: Space Physics, Vol. 126, No. 10, e2021JA029518, 10.2021.

Research output: Contribution to journal › Article › peer-review

Harvard

Nakamura, R, Baumjohann, W, Nakamura, TKM, Schmid, D, Varsani, A, Apatenkov, S , Sergeev, VA, Birn, J, Nagai, T, Gabrielse, C, André, M, Burch, JL, Carr, C, Dandouras, IS, Escoubet, CP, Fazakerley, AN, Giles, BL, Le Contel, O, Russell, CT & Torbert, RB 2021, 'Thin Current Sheet Behind the Dipolarization Front', journal of geophysical research: Space Physics, vol. 126, no. 10, e2021JA029518. https://doi.org/10.1029/2021JA029518

APA

Nakamura, R., Baumjohann, W., Nakamura, T. K. M., Schmid, D., Varsani, A., Apatenkov, S., Sergeev, V. A., Birn, J., Nagai, T., Gabrielse, C., André, M., Burch, J. L., Carr, C., Dandouras, I. S., Escoubet, C. P., Fazakerley, A. N., Giles, B. L., Le Contel, O., Russell, C. T., & Torbert, R. B. (2021). Thin Current Sheet Behind the Dipolarization Front. journal of geophysical research: Space Physics, 126(10), [e2021JA029518]. https://doi.org/10.1029/2021JA029518

Vancouver

Nakamura R, Baumjohann W, Nakamura TKM, Schmid D, Varsani A, Apatenkov S et al. Thin Current Sheet Behind the Dipolarization Front. journal of geophysical research: Space Physics. 2021 Oct;126(10). e2021JA029518. https://doi.org/10.1029/2021JA029518

Author

Nakamura, R. ; Baumjohann, W. ; Nakamura, T. K.M. ; Schmid, D. ; Varsani, A. ; Apatenkov, S. ; Sergeev, V. A. ; Birn, J. ; Nagai, T. ; Gabrielse, C. ; André, M. ; Burch, J. L. ; Carr, C. ; Dandouras, I. S. ; Escoubet, C. P. ; Fazakerley, A. N. ; Giles, B. L. ; Le Contel, O. ; Russell, C. T. ; Torbert, R. B. / Thin Current Sheet Behind the Dipolarization Front. In: journal of geophysical research: Space Physics. 2021 ; Vol. 126, No. 10.

BibTeX

@article{16128bd93ba049a1b823a2f95a7659af,

title = "Thin Current Sheet Behind the Dipolarization Front",

abstract = "We report a unique conjugate observation of fast flows and associated current sheet disturbances in the near-Earth magnetotail by MMS (Magnetospheric Multiscale) and Cluster preceding a positive bay onset of a small substorm at ∼14:10 UT, September 8, 2018. MMS and Cluster were located both at X ∼ −14 RE. A dipolarization front (DF) of a localized fast flow was detected by Cluster and MMS, separated in the dawn-dusk direction by ∼4 RE, almost simultaneously. Adiabatic electron acceleration signatures revealed from the comparison of the energy spectra confirm that both spacecraft encounter the same DF. We analyzed the change in the current sheet structure based on multi-scale multi-point data analysis. The current sheet thickened during the passage of DF, yet, temporally thinned subsequently associated with another flow enhancement centered more on the dawnward side of the initial flow. MMS and Cluster observed intense perpendicular and parallel current in the off-equatorial region mainly during this interval of the current sheet thinning. Maximum field-aligned currents both at MMS and Cluster are directed tailward. Detailed analysis of MMS data showed that the intense field-aligned currents consisted of multiple small-scale intense current layers accompanied by enhanced Hall-currents in the dawn-dusk flow-shear region. We suggest that the current sheet thinning is related to the flow bouncing process and/or to the expansion/activation of reconnection. Based on these mesoscale and small-scale multipoint observations, 3D evolution of the flow and current-sheet disturbances was inferred preceding the development of a substorm current wedge.",

keywords = "bursty bulk flow, Cluster, current sheet, dipolarization front, electron acceleration, MMS, ELECTRIC-FIELD, RECONNECTION, DRIVEN, MODEL, MAGNETOSPHERE, FLOW-BRAKING, KINETIC BALLOONING/INTERCHANGE INSTABILITY, MAGNETOTAIL",

author = "R. Nakamura and W. Baumjohann and Nakamura, {T. K.M.} and D. Schmid and A. Varsani and S. Apatenkov and Sergeev, {V. A.} and J. Birn and T. Nagai and C. Gabrielse and M. Andr{\'e} and Burch, {J. L.} and C. Carr and Dandouras, {I. S.} and Escoubet, {C. P.} and Fazakerley, {A. N.} and Giles, {B. L.} and {Le Contel}, O. and Russell, {C. T.} and Torbert, {R. B.}",

year = "2021",

month = oct,

doi = "10.1029/2021JA029518",

language = "English",

volume = "126",

journal = "Journal of Geophysical Research: Space Physics",

issn = "2169-9380",

publisher = "Wiley-Blackwell",

number = "10",

}

RIS

TY - JOUR

T1 - Thin Current Sheet Behind the Dipolarization Front

AU - Nakamura, R.

AU - Baumjohann, W.

AU - Nakamura, T. K.M.

AU - Schmid, D.

AU - Varsani, A.

AU - Apatenkov, S.

AU - Sergeev, V. A.

AU - Birn, J.

AU - Nagai, T.

AU - Gabrielse, C.

AU - André, M.

AU - Burch, J. L.

AU - Carr, C.

AU - Dandouras, I. S.

AU - Escoubet, C. P.

AU - Fazakerley, A. N.

AU - Giles, B. L.

AU - Le Contel, O.

AU - Russell, C. T.

AU - Torbert, R. B.

PY - 2021/10

Y1 - 2021/10

N2 - We report a unique conjugate observation of fast flows and associated current sheet disturbances in the near-Earth magnetotail by MMS (Magnetospheric Multiscale) and Cluster preceding a positive bay onset of a small substorm at ∼14:10 UT, September 8, 2018. MMS and Cluster were located both at X ∼ −14 RE. A dipolarization front (DF) of a localized fast flow was detected by Cluster and MMS, separated in the dawn-dusk direction by ∼4 RE, almost simultaneously. Adiabatic electron acceleration signatures revealed from the comparison of the energy spectra confirm that both spacecraft encounter the same DF. We analyzed the change in the current sheet structure based on multi-scale multi-point data analysis. The current sheet thickened during the passage of DF, yet, temporally thinned subsequently associated with another flow enhancement centered more on the dawnward side of the initial flow. MMS and Cluster observed intense perpendicular and parallel current in the off-equatorial region mainly during this interval of the current sheet thinning. Maximum field-aligned currents both at MMS and Cluster are directed tailward. Detailed analysis of MMS data showed that the intense field-aligned currents consisted of multiple small-scale intense current layers accompanied by enhanced Hall-currents in the dawn-dusk flow-shear region. We suggest that the current sheet thinning is related to the flow bouncing process and/or to the expansion/activation of reconnection. Based on these mesoscale and small-scale multipoint observations, 3D evolution of the flow and current-sheet disturbances was inferred preceding the development of a substorm current wedge.

AB - We report a unique conjugate observation of fast flows and associated current sheet disturbances in the near-Earth magnetotail by MMS (Magnetospheric Multiscale) and Cluster preceding a positive bay onset of a small substorm at ∼14:10 UT, September 8, 2018. MMS and Cluster were located both at X ∼ −14 RE. A dipolarization front (DF) of a localized fast flow was detected by Cluster and MMS, separated in the dawn-dusk direction by ∼4 RE, almost simultaneously. Adiabatic electron acceleration signatures revealed from the comparison of the energy spectra confirm that both spacecraft encounter the same DF. We analyzed the change in the current sheet structure based on multi-scale multi-point data analysis. The current sheet thickened during the passage of DF, yet, temporally thinned subsequently associated with another flow enhancement centered more on the dawnward side of the initial flow. MMS and Cluster observed intense perpendicular and parallel current in the off-equatorial region mainly during this interval of the current sheet thinning. Maximum field-aligned currents both at MMS and Cluster are directed tailward. Detailed analysis of MMS data showed that the intense field-aligned currents consisted of multiple small-scale intense current layers accompanied by enhanced Hall-currents in the dawn-dusk flow-shear region. We suggest that the current sheet thinning is related to the flow bouncing process and/or to the expansion/activation of reconnection. Based on these mesoscale and small-scale multipoint observations, 3D evolution of the flow and current-sheet disturbances was inferred preceding the development of a substorm current wedge.

KW - bursty bulk flow

KW - Cluster

KW - current sheet

KW - dipolarization front

KW - electron acceleration

KW - MMS

KW - ELECTRIC-FIELD

KW - RECONNECTION

KW - DRIVEN

KW - MODEL

KW - MAGNETOSPHERE

KW - FLOW-BRAKING

KW - KINETIC BALLOONING/INTERCHANGE INSTABILITY

KW - MAGNETOTAIL

UR - http://www.scopus.com/inward/record.url?scp=85118160960&partnerID=8YFLogxK

UR - https://www.mendeley.com/catalogue/d0cb3b7e-5929-3f5f-a693-6c043b06568c/

U2 - 10.1029/2021JA029518

DO - 10.1029/2021JA029518

M3 - Article

AN - SCOPUS:85118160960

VL - 126

JO - Journal of Geophysical Research: Space Physics

JF - Journal of Geophysical Research: Space Physics

SN - 2169-9380

IS - 10

M1 - e2021JA029518

ER -

ID: 88423777