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Two Classes of Equatorial Magnetotail Dipolarization Fronts Observed by Magnetospheric Multiscale Mission: A Statistical Overview
Univ Paris Saclay, Inst Polytech Paris, UMR7648, Lab Phys Plasmas LPP,CNRS,Sorbonne Univ,Observ Par, Paris, France..
Univ Paris Saclay, Inst Polytech Paris, UMR7648, Lab Phys Plasmas LPP,CNRS,Sorbonne Univ,Observ Par, Paris, France..
Univ Paris Saclay, Inst Polytech Paris, UMR7648, Lab Phys Plasmas LPP,CNRS,Sorbonne Univ,Observ Par, Paris, France..
Univ Paris Saclay, Inst Polytech Paris, UMR7648, Lab Phys Plasmas LPP,CNRS,Sorbonne Univ,Observ Par, Paris, France..
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2023 (English)In: Journal of Geophysical Research - Space Physics, ISSN 2169-9380, E-ISSN 2169-9402, Vol. 128, no 10, article id e2023JA031738Article in journal (Refereed) Published
Abstract [en]

We carried out a statistical study of equatorial dipolarization fronts (DFs) detected by the Magnetospheric Multiscale mission during the full 2017 Earth's magnetotail season. We found that two DF classes are distinguished: class I (74.4%) corresponds to the standard DF properties and energy dissipation and a new class II (25.6%). This new class includes the six DF discussed in Alqeeq et al. (2022, ) and corresponds to a bump of the magnetic field associated with a minimum in the ion and electron pressures and a reversal of the energy conversion process. The possible origin of this second class is discussed. 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.

Place, publisher, year, edition, pages
American Geophysical Union (AGU), 2023. Vol. 128, no 10, article id e2023JA031738
Keywords [en]
dipolarization fronts, energy conversion, Earth's magnetotail, Earth's magnetosphere, plasma transport
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:uu:diva-515051DOI: 10.1029/2023JA031738ISI: 001077963700001OAI: oai:DiVA.org:uu-515051DiVA, id: diva2:1809475
Available from: 2023-11-03 Created: 2023-11-03 Last updated: 2023-11-03Bibliographically approved

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Khotyaintsev, Yuri V.

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Swedish Institute of Space Physics, Uppsala Division
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