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  Magnetosheath jets observed by Cluster: Dawn/dusk asymmetries and kinetic effects

Echim, M., Mirela, V., Gabriel, V., Costel, M., Eliza, T., Catalin, N. (2023): Magnetosheath jets observed by Cluster: Dawn/dusk asymmetries and kinetic effects, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-4497

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5021924 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5021924_1
Genre: Conference Paper

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 Creators:
Echim, Marius1, Author
Mirela, Voiculescu1, Author
Gabriel, Voitcu1, Author
Costel, Munteanu1, Author
Eliza, Teodorescu1, Author
Catalin, Negrea1, Author
Affiliations:
1IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations, ou_5011304              

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 Abstract: We analyse magnetosheath data recorded by Cluster-3 spacecraft in 2007 and 2008. We applied an algorithm to detect magnetosheath jets based on searching localised enhancements of the dynamic pressure. The analysis is performed in coherence with previous strategies adopted for jet detection and provides a number of 960 magnetosheath jets (354 events in 2007 versus 606 events in 2008). The self-consistency of magnetosheath jets and the preservation of their physical identity (shape and physical properties), implicitly assumed in many recent experimental studies, results as a consequence of kinetic processes at the edges of the jets. Theoretical models provide evidence for the fundamental role played by a polarization electric field sustaining the forward motion of the jet with respect to the background plasma. The conservation of the magnetic moment of ions leads to a decrease of jets forward speed when it moves into increasing magnetic field. We found evidence for deceleration and perpendicular heating of jets with decreasing distance to the Earth. The braking of jets is correlated with the variation of the magnetic field intensity: the stronger the magnetic field gradient, the more efficient is the jet breaking. The perturbative effects of jets on the background magnetosheath density/temperature are stronger in the dusk/dawn flank. An increased number of magnetosheath jets is found in the dawn flank.

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Language(s): eng - English
 Dates: 2023-07-112023-07-11
 Publication Status: Finally published
 Pages: -
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 Rev. Type: -
 Identifiers: DOI: 10.57757/IUGG23-4497
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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Place of Event: Berlin
Start-/End Date: 2023-07-11 - 2023-07-20

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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Source Genre: Proceedings
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Publ. Info: Potsdam : GFZ German Research Centre for Geosciences
Pages: - Volume / Issue: - Sequence Number: - Start / End Page: - Identifier: -