Solar Wind Parameters Influencing Magnetosheath Jet Formation: Low and High IMF Cone Angle Regimes

Vuorinen, Laura; Hietala, Heli; LaMoury, Adrian T.; Plaschke, Ferdinand

doi:10.1029/2023ja031494

Cited by 3 publications

(1 citation statement)

References 51 publications

(111 reference statements)

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“…Recent studies have shed light on a crucial characteristic of the bow shock: the occurrence of jets in its downstream region (see, e.g. 1 – 5 ). Jets are transient enhancements in plasma dynamic pressure which typically surpass the dynamic pressure of the upstream solar wind 6 .…”

Section: Introductionmentioning

confidence: 99%

Magnetosheath jets at Jupiter and across the solar system

Zhou,

Raptis,

Wang

et al. 2024

Nat Commun

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The study of jets in the Earth’s magnetosheath has been a subject of extensive investigation for over a decade due to their profound impact on the geomagnetic environment and their close connection with shock dynamics. While the variability of the solar wind and its interaction with Earth’s magnetosphere provide valuable insights into jets across a range of parameters, a broader parameter space can be explored by examining the magnetosheath of other planets. Here we report the existence of anti-sunward and sunward jets in the Jovian magnetosheath and show their close association with magnetic discontinuities. The anti-sunward jets are possibly generated by a shock–discontinuity interaction. Finally, through a comparative analysis of jets observed at Earth, Mars, and Jupiter, we show that the size of jets scales with the size of bow shock.

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Section: Introductionmentioning

confidence: 99%

Magnetosheath jets at Jupiter and across the solar system

Zhou,

Raptis,

Wang

et al. 2024

Nat Commun

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Jets Downstream of Collisionless Shocks: Recent Discoveries and Challenges

Krämer,

Koller,

Suni

et al. 2024

Space Sci Rev

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Plasma flows with enhanced dynamic pressure, known as magnetosheath jets, are often found downstream of collisionless shocks. As they propagate through the magnetosheath, they interact with the surrounding plasma, shaping its properties, and potentially becoming geoeffective upon reaching the magnetopause. In recent years (since 2016), new research has produced vital results that have significantly enhanced our understanding on many aspects of jets. In this review, we summarise and discuss these findings. Spacecraft and ground-based observations, as well as global and local simulations, have contributed greatly to our understanding of the causes and effects of magnetosheath jets. First, we discuss recent findings on jet occurrence and formation, including in other planetary environments. New insights into jet properties and evolution are then examined using observations and simulations. Finally, we review the impact of jets upon interaction with the magnetopause and subsequent consequences for the magnetosphere-ionosphere system. We conclude with an outlook and assessment on future challenges. This includes an overview on future space missions that may prove crucial in tackling the outstanding open questions on jets in the terrestrial magnetosheath as well as other planetary and shock environments.

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Candidates for downstream jets at interplanetary shocks

Hietala,

Trotta,

Fedeli

et al. 2024

Monthly Notices of the Royal Astronomical Society

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Localised dynamic pressure enhancements arising from kinetic processes are frequently observed downstream of the Earth’s bow shock. These structures, called jets, modify their plasma surroundings and participate in particle energisation. Here, we report the first observations of jet-like structures at a non-planetary shock environment: downstream of interplanetary shocks. We introduce an analysis approach suitable for such conditions and apply it to Wind spacecraft data. We present one event with a Mach number similar to the Earth’s bow shock as a benchmark, as well as two low Mach number, low beta shocks: a parameter range that is difficult to access at planets. The jet-like structures we find are tens of ion inertial lengths in size, and some are observed further away from the shock than in a limited magnetosheath. We find that their properties are similar to those of magnetosheath jets: in the frame of the shock these structures are fast, cold, and most have no strong magnetic field variations. All three interplanetary shocks feature foreshock activity, but no strongly compressive waves. We discuss the implications these findings have for the proposed jet formation mechanisms.

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Solar Wind Parameters Influencing Magnetosheath Jet Formation: Low and High IMF Cone Angle Regimes

Cited by 3 publications

References 51 publications

Magnetosheath jets at Jupiter and across the solar system

Magnetosheath jets at Jupiter and across the solar system

Jets Downstream of Collisionless Shocks: Recent Discoveries and Challenges

Candidates for downstream jets at interplanetary shocks

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