Dynamics and waves near multiple magnetic null points in reconnection diffusion region

X. H. Deng; M. Zhou; S. Y. Li; W. Baumjohann; M. Andre; N. Cornilleau; O. Santolik; D. I. Pontin; H. Reme; E. Lucek; A. N. Fazakerley; P. Decreau; P. Daly; R. Nakamura; R. X. Tang; Y. H. Hu; Y. Pang; J. Buechner; H. Zhao; A. Vaivads; J. S. Pickett; C. S. Ng; X. Lin; S. Fu; Z. G. Yuan; Z. W. Su; J. F. Wang

doi:10.1029/2008JA013197

Dynamics and waves near multiple magnetic null points in reconnection diffusion region

X. H. Deng, M. Zhou, S. Y. Li, W. Baumjohann, M. Andre, N. Cornilleau, O. Santolik, D. I. Pontin, H. Reme, E. Lucek, A. N. Fazakerley, P. Decreau, P. Daly, R. Nakamura, R. X. Tang, Y. H. Hu, Y. Pang, J. Buechner, H. Zhao, A. VaivadsJ. S. Pickett, C. S. Ng, X. Lin, S. Fu, Z. G. Yuan, Z. W. Su, J. F. Wang

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Abstract

Identifying the magnetic structure in the region where the magnetic field lines break and how reconnection happens is crucial to improving our understanding of three-dimensional reconnection. Here we show the in situ observation of magnetic null structures in the diffusion region, the dynamics, and the associated waves. Possible spiral null pair has been identified near the diffusion region. There is a close relation among the null points, the bipolar signature of the Z component of the magnetic field, and enhancement of the flux of energetic electrons up to 100 keV. Near the null structures, whistler-mode waves were identified by both the polarity and the power law of the spectrum of electric and magnetic fields. It is found that the angle between the fans of the nulls is quite close to the theoretically estimated maximum value of the group-velocity cone angle for the whistler wave regime of reconnection.

Original language	English
Article number	A07216
Pages (from-to)	-
Number of pages	7
Journal	Journal of Geophysical Research: Space Physics
Volume	114
Issue number	A7
DOIs	https://doi.org/10.1029/2008JA013197
Publication status	Published - 2009

Keywords

Hybrid drift instability
Earth's magnetosphere
Cluster
Field
Topology
Flare

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Deng, X. H., Zhou, M., Li, S. Y., Baumjohann, W., Andre, M., Cornilleau, N., Santolik, O., Pontin, D. I., Reme, H., Lucek, E., Fazakerley, A. N., Decreau, P., Daly, P., Nakamura, R., Tang, R. X., Hu, Y. H., Pang, Y., Buechner, J., Zhao, H., ... Wang, J. F. (2009). Dynamics and waves near multiple magnetic null points in reconnection diffusion region. Journal of Geophysical Research: Space Physics, 114(A7), -. Article A07216. https://doi.org/10.1029/2008JA013197

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title = "Dynamics and waves near multiple magnetic null points in reconnection diffusion region",

abstract = "Identifying the magnetic structure in the region where the magnetic field lines break and how reconnection happens is crucial to improving our understanding of three-dimensional reconnection. Here we show the in situ observation of magnetic null structures in the diffusion region, the dynamics, and the associated waves. Possible spiral null pair has been identified near the diffusion region. There is a close relation among the null points, the bipolar signature of the Z component of the magnetic field, and enhancement of the flux of energetic electrons up to 100 keV. Near the null structures, whistler-mode waves were identified by both the polarity and the power law of the spectrum of electric and magnetic fields. It is found that the angle between the fans of the nulls is quite close to the theoretically estimated maximum value of the group-velocity cone angle for the whistler wave regime of reconnection.",

keywords = "Hybrid drift instability, Earth's magnetosphere, Cluster, Field, Topology, Flare",

author = "Deng, {X. H.} and M. Zhou and Li, {S. Y.} and W. Baumjohann and M. Andre and N. Cornilleau and O. Santolik and Pontin, {D. I.} and H. Reme and E. Lucek and Fazakerley, {A. N.} and P. Decreau and P. Daly and R. Nakamura and Tang, {R. X.} and Hu, {Y. H.} and Y. Pang and J. Buechner and H. Zhao and A. Vaivads and Pickett, {J. S.} and Ng, {C. S.} and X. Lin and S. Fu and Yuan, {Z. G.} and Su, {Z. W.} and Wang, {J. F.}",

year = "2009",

doi = "10.1029/2008JA013197",

language = "English",

volume = "114",

pages = "--",

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

issn = "0148-0227",

publisher = "American Geophysical Union",

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Deng, XH, Zhou, M, Li, SY, Baumjohann, W, Andre, M, Cornilleau, N, Santolik, O, Pontin, DI, Reme, H, Lucek, E, Fazakerley, AN, Decreau, P, Daly, P, Nakamura, R, Tang, RX, Hu, YH, Pang, Y, Buechner, J, Zhao, H, Vaivads, A, Pickett, JS, Ng, CS, Lin, X, Fu, S, Yuan, ZG, Su, ZW & Wang, JF 2009, 'Dynamics and waves near multiple magnetic null points in reconnection diffusion region', Journal of Geophysical Research: Space Physics, vol. 114, no. A7, A07216, pp. -. https://doi.org/10.1029/2008JA013197

TY - JOUR

T1 - Dynamics and waves near multiple magnetic null points in reconnection diffusion region

AU - Deng, X. H.

AU - Zhou, M.

AU - Li, S. Y.

AU - Baumjohann, W.

AU - Andre, M.

AU - Cornilleau, N.

AU - Santolik, O.

AU - Pontin, D. I.

AU - Reme, H.

AU - Lucek, E.

AU - Fazakerley, A. N.

AU - Decreau, P.

AU - Daly, P.

AU - Nakamura, R.

AU - Tang, R. X.

AU - Hu, Y. H.

AU - Pang, Y.

AU - Buechner, J.

AU - Zhao, H.

AU - Vaivads, A.

AU - Pickett, J. S.

AU - Ng, C. S.

AU - Lin, X.

AU - Fu, S.

AU - Yuan, Z. G.

AU - Su, Z. W.

AU - Wang, J. F.

PY - 2009

Y1 - 2009

N2 - Identifying the magnetic structure in the region where the magnetic field lines break and how reconnection happens is crucial to improving our understanding of three-dimensional reconnection. Here we show the in situ observation of magnetic null structures in the diffusion region, the dynamics, and the associated waves. Possible spiral null pair has been identified near the diffusion region. There is a close relation among the null points, the bipolar signature of the Z component of the magnetic field, and enhancement of the flux of energetic electrons up to 100 keV. Near the null structures, whistler-mode waves were identified by both the polarity and the power law of the spectrum of electric and magnetic fields. It is found that the angle between the fans of the nulls is quite close to the theoretically estimated maximum value of the group-velocity cone angle for the whistler wave regime of reconnection.

AB - Identifying the magnetic structure in the region where the magnetic field lines break and how reconnection happens is crucial to improving our understanding of three-dimensional reconnection. Here we show the in situ observation of magnetic null structures in the diffusion region, the dynamics, and the associated waves. Possible spiral null pair has been identified near the diffusion region. There is a close relation among the null points, the bipolar signature of the Z component of the magnetic field, and enhancement of the flux of energetic electrons up to 100 keV. Near the null structures, whistler-mode waves were identified by both the polarity and the power law of the spectrum of electric and magnetic fields. It is found that the angle between the fans of the nulls is quite close to the theoretically estimated maximum value of the group-velocity cone angle for the whistler wave regime of reconnection.

KW - Hybrid drift instability

KW - Earth's magnetosphere

KW - Cluster

KW - Field

KW - Topology

KW - Flare

U2 - 10.1029/2008JA013197

DO - 10.1029/2008JA013197

M3 - Article

SN - 0148-0227

VL - 114

SP - -

JO - Journal of Geophysical Research: Space Physics

JF - Journal of Geophysical Research: Space Physics

IS - A7

M1 - A07216

ER -

Dynamics and waves near multiple magnetic null points in reconnection diffusion region

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Keywords

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