Mechanisms and Evolution of Geoeffective Large-Scale Plasma Jets in the Magnetosheath

Дмитриев, А. В.; Lalchand, Bhavana; Ghosh, Sayantan

doi:10.3390/universe7050152

Cited by 9 publications

(7 citation statements)

References 60 publications

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“…All events have durations larger than the average 30 s reported for jets downstream of the quasi‐parallel shock (Archer & Horbury, 2013 ), and rather fit the durations found by Dmitriev et al. ( 2021 ) for larger scale jets. They show enhancements in speed and magnetic field magnitude.…”

Section: Discussionsupporting

confidence: 81%

“…Such jets have average duration of ∼30 s. On the other hand the existence of large scale jets with durations from 30 s to 3 min peaking at 80 s has been shown by Dmitriev et al. ( 2021 ). These authors show that in contrast to the smaller scale jets which occur predominantly in the subsolar region, the large jets have been observed in a wide longitudinal range of ∼70°, which can include the quasi‐perpendicular magnetosheath.…”

Section: Introductionmentioning

confidence: 77%

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Jets and Mirror Mode Waves in Earth's Magnetosheath

et al. 2023

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Magnetosheath jets are localized plasma structures with high dynamic pressure which are frequently observed downstream of the Earth's bow shock. In this work we analyze Magnetospheric MultiScale magnetic field and plasma data and show that jets can be found in the quasi‐perpendicular magnetosheath in regions permeated by Mirror mode waves (MMWs). We show that structures identified as jets by their enhanced dynamic pressure can have very different internal structure, with variable signatures in magnetic field magnitude and components, velocity, and density and can be associated to ion distribution functions of various types. This suggests that jets observed in the quasi‐perpendicular magnetosheath are generated by different mechanisms. We find that jets can be related to traveling foreshocks, flux transfer events, and some have MMWs inside them. Our results suggest that some jets have a local source and their formation does not depend on upstream structures. We find that different types of ion distributions can exist inside the jets, while in some cases anisotropic distributions are present, in others counterstreaming distributions exist. We also show that for jets with MMWs inside them, ion distributions can be modulated. This highlights the importance of using ion distributions to identify and classify different types of jets.

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Section: Discussionsupporting

confidence: 81%

Section: Introductionmentioning

confidence: 77%

Jets and Mirror Mode Waves in Earth's Magnetosheath

et al. 2023

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“…There are several causes suggested for their formation including the BS ripples (Hietala et al, 2009;Hietala et al, 2012) and interaction of the SW discontinuities with the BS (Němeček et al, 1998;Savin et al, 2004;Savin et al 2011;Savin et al 2012;Dmitriev et al, 2021). A full overview of the phenomena can be found in Plaschke et al (2018) and Dmitriev et al (2021). Here, we highlight the results referring to the dependence of the jets on the SW parameters.…”

Section: Msh Jets and Their Dependence On The Sw Parametersmentioning

confidence: 85%

“…Presence of jets, usually described as transient enhancements of the dynamic pressure or density, is an important phenomenon in the magnetosheath as they can lead to local deformations in the magnetopause and plasma penetration (Lemaire, 1977;Lemaire and Roth, 1978;Dmitriev and Suvorova, 2015). There are several causes suggested for their formation including the BS ripples (Hietala et al, 2009;Hietala et al, 2012) and interaction of the SW discontinuities with the BS (Němeček et al, 1998;Savin et al, 2004;Savin et al 2011;Savin et al 2012;Dmitriev et al, 2021). A full overview of the phenomena can be found in Plaschke et al (2018) and Dmitriev et al (2021).…”

Section: Msh Jets and Their Dependence On The Sw Parametersmentioning

confidence: 99%

Role of the variable solar wind in the dynamics of small-scale magnetosheath structures

Rakhmanova

Рязанцева

Zastenker

et al. 2023

Front. Astron. Space Sci.

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Varying solar wind plays a crucial role in the processes inside the magnetosphere. Statistical studies generally reveal the geoeffectiveness of solar wind streams of different origins and types, characterized by various parameters such as dynamic pressure and magnetic field orientation. However, the predictions of the space weather are still not completely reliable. Small-scale structures (observed as high-amplitude variations with frequencies above 0.01 Hz) involved in the turbulent flow of the solar wind and in the magnetosheath may contribute to the models’ inaccuracies. Spacecraft measurements obtained during last 2 decades provide a great amount of new information about small-scale plasma processes in near-Earth space. However, the influence of solar wind on the dynamics of the small-scale structures in the magnetosheath has been rarely addressed. The present review summarizes experimental studies on this influence including features of turbulence around ion scales. The study aims to give a general picture of the problem and underline the gaps in current understanding of the role of the dynamics of the small-scale structures and turbulence in the solar–terrestrial relations.

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“…In the following we will use the term "magnetosheath jet" (MSHJ) for the magnetosheath plasma structures characterized by an excess of the dynamics pressure compared to a background value. Studies of magnetosheath jets benefit from high resolution, multi-point measurements provided by spacecraft like Cluster, THEMIS and MMS during the minimum and/or maximum phase of the solar cycle (Shue et al, 2009;Archer et al, 2012;Plaschke et al, 2013;Plaschke et al, 2016;Plaschke et al, 2020;Plaschke et al, 2018;Karlsson et al, 2018;Raptis et al, 2019;Raptis et al, 2020;Vuorinen et al, 2019;Goncharov et al, 2020;Escoubet et al, 2020;Dmitriev et al, 2021;Koller et al, 2022, see Plaschke et al, 2018 for a review). High resolution data allow for a better sampling of plasma parameters and a better statistics for jet detection.…”

Section: Methodsmentioning

confidence: 99%

On the phenomenology of magnetosheath jets with insight from theory, modelling, numerical simulations and observations by Cluster spacecraft

Echim

Voiculescu²,

Munteanu³

et al. 2023

Front. Astron. Space Sci.

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Introduction: During recent years magnetosheath plasma structures called “jets” are identified in spacecraft data as localized regions in the magnetosheath where the dynamic pressure is enhanced compared to the background. Although the nomenclature and detection algorithms vary from author to author, magnetosheath jets are part of a larger class of phenomena which can be globally called magnetosheath irregularities. In this review we focus on elements of jets phenomenology less discussed in the literature, though sustained by theoretical models for solar wind magnetosphere interaction, numerical studies based on Vlasov equilibrium models or kinetic numerical simulations.Methods: The self-consistency of magnetosheath jets and the preservation of their physical identity (shape and physical properties), implicitly assumed in many recent experimental studies, is discussed in modelling and simulations studies and results as a consequence of kinetic processes at the edges of the jets. These studies 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. Another natural consequence is the backward motion of surrounding magnetosheath plasma at the edges of jets. The conservation of magnetic moment of ions leads to a decrease of jets forward speed when it moves into increasing magnetic field. Our review is complemented by an analysis of magnetosheath data recorded by Cluster in 2007 and 2008. We applied an algorithm to detect jets based on searching localized enhancements of the dynamic pressure.Results: This algorithm identifies a number of 960 magnetosheath jets (354 events in 2007 versus 606 events in 2008). A statistical analysis of jet plasma properties reveals an asymmetric distribution of the number of jets as well as a dawn-dusk asymmetry of jets temperature and density. The perturbative effects of jets on the background magnetosheath density/temperature are stronger in the dusk/dawn flank. We also 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.

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Mechanisms and Evolution of Geoeffective Large-Scale Plasma Jets in the Magnetosheath

Cited by 9 publications

References 60 publications

Jets and Mirror Mode Waves in Earth's Magnetosheath

Jets and Mirror Mode Waves in Earth's Magnetosheath

Role of the variable solar wind in the dynamics of small-scale magnetosheath structures

On the phenomenology of magnetosheath jets with insight from theory, modelling, numerical simulations and observations by Cluster spacecraft

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