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Poster De Conférence Année : 2023

Two classes of magnetotail Dipolarization Fronts observed by MagnetosphericMultiscale Mission: A statistical overview

Soboh Alqeeq
Olivier Le Contel
Alessandro Retinò
Rumi Nakamura
  • Fonction : Auteur
Narges Ahmadi
  • Fonction : Auteur
Frederick Wilder
  • Fonction : Auteur
Daniel Gershman
Yuri Khotyaintsev
Per Arne Lindqvist
Robert Ergun
  • Fonction : Auteur
James Burch
  • Fonction : Auteur
Roy Torbert
  • Fonction : Auteur
Stephen Fuselier
  • Fonction : Auteur
Christopher Russell
Hanying Wei
  • Fonction : Auteur
Robert Strangeway
  • Fonction : Auteur

Résumé

We carried out a statistical study of 132 Dipolarization Fronts (DFs) events detected by the Magnetospheric Multiscale mission (MMS) during the full 2017 Earth’s magnetotail season. We found that two DF classes can be distinguished: class I (74.4%) corresponds to the standard DF properties and energy dissipation whereas a new class II (25.6%), which includes the six DF discussed in S. Alqeeq et al. 2022, corresponds to a bump of the magnetic field associated with a minimum of the ion and electron pressures and a reversal of the energy conversion process. For both classes we found that ions are mostly decoupled from the magnetic field by the Hall fields. The electron pressure gradient term is also contributing to the ion decoupling and likely responsible for an electron decoupling at DF. Both DF classes show that the energy conversion process in the spacecraft frame is driven by the diamagnetic current dominated by the ion pressure gradient. In the fluid frame, it is driven by the electron pressure gradient. In addition, we have shown that the energy conversion processes are not homogeneous at the electron scale mostly due to the variations of the electric fields for both DF classes.
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Dates et versions

hal-04289511 , version 1 (20-02-2024)

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Citer

Soboh Alqeeq, Olivier Le Contel, Patrick Canu, Alessandro Retinò, Thomas Chust, et al.. Two classes of magnetotail Dipolarization Fronts observed by MagnetosphericMultiscale Mission: A statistical overview. EGU General Assembly 2023, Apr 2023, Vienna (Austria), Austria. 2023, ⟨10.5194/egusphere-egu23-7317⟩. ⟨hal-04289511⟩
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