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Communication Dans Un Congrès Année : 2017

Multi-scale multi-point observation of dipolarization in the near-Earth's magnetotail

R. Nakamura
A. Varsani
K. Genestreti
  • Fonction : Auteur
T. Nakamura
  • Fonction : Auteur
W. Baumjohann
Joachim Birn
  • Fonction : Auteur
Olivier Le Contel
T. Nagai

Résumé

We report on evolution of the dipolarization in the near-Earth plasma sheet during two intense substorms based on observations when the four spacecraft of the Magnetospheric Multiscale (MMS) together with GOES and Geotail were located in the near Earth magnetotail. These multiple spacecraft together with the ground-based magnetogram enabled to obtain the location of the large- scale substorm current wedge (SCW) and overall changes in the plasma sheet configuration. MMS was located in the southern hemisphere at the outer plasma sheet and observed fast flow disturbances associated with dipolarizations. The high time-resolution measurements from MMS enable us to detect the rapid motion of the field structures and the flow disturbances separately and to resolve signatures below the ion-scales. We found small-scale transient field-aligned current sheets associated with upward streaming cold plasmas and Hall-current layers in the fast flow shear region. Observations of these current structures are compared with simulations of reconnection jets.
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Dates et versions

hal-02752284 , version 1 (03-06-2020)

Identifiants

  • HAL Id : hal-02752284 , version 1

Citer

R. Nakamura, A. Varsani, K. Genestreti, T. Nakamura, W. Baumjohann, et al.. Multi-scale multi-point observation of dipolarization in the near-Earth's magnetotail. AGU Fall Meeting, Dec 2017, New Orleans, Louisiane, United States. ⟨hal-02752284⟩
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