Bursty magnetic reconnection at the Earth's magnetopause triggered by high-speed jets

Ng, Jonathan; Chen, L.-J.; Omelchenko, Y. A.

doi:10.1063/5.0054394

Cited by 25 publications

(40 citation statements)

References 48 publications

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“…Similar magnetosheath fluctuations are identified in the global hybrid simulation by Ng et al. ( 2021 ), where the driving IMF was steadily southward with a large radial component, like the observed IMF. Figure 4m presents the wavelet amplitudes of Ng et al.…”

Section: Potential Drivers Of Reconnection Variabilitysupporting

confidence: 84%

“…Given that the fluctuating Bz structures in Ng et al. ( 2021 ) result from the transmission of foreshock waves, we postulate that the foreshock waves may be the driver of the observed magnetosheath fluctuations and the unsteady reconnection.…”

Section: Potential Drivers Of Reconnection Variabilitymentioning

confidence: 67%

“…The good consistency indicates that the observation and the simulation likely capture the same physical process. Given that the fluctuating Bz structures in Ng et al (2021) result from the transmission of foreshock waves, we postulate that the foreshock waves may be the driver of the observed magnetosheath fluctuations and the unsteady reconnection.…”

Section: Potential Drivers Of Reconnection Variabilitymentioning

confidence: 91%

“…HSJs are localized enhancements of dynamic pressure in the magnetosheath (Němeček et al., 1998 ; Savin et al., 2008 ) and they tend to occur during intervals of stable radial IMF (Archer & Horbury, 2013 ; LaMoury et al., 2021 ; Plaschke et al., 2013 ). As HSJs impinge on the magnetopause, they cause boundary indentations (e.g., Amata et al., 2011 ; Shue et al., 2009 ), and can trigger local reconnection as demonstrated by multi‐spacecraft observations (Hietala et al., 2018 ) and a global hybrid simulation (Ng et al., 2021 ).…”

Section: Potential Drivers Of Reconnection Variabilitymentioning

confidence: 99%

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Unsteady Magnetopause Reconnection Under Quasi‐Steady Solar Wind Driving

Zou

Walsh

Chen

et al. 2022

Geophysical Research Letters

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Despite the consensus that magnetic reconnection at the sun and in the Earth's magnetotail typically occurs in a highly bursty manner, whether the same is true for magnetopause reconnection remains an outstanding question. Numerous efforts have been made to understand whether magnetopause reconnection is intrinsically intermittent by examining accelerated plasma jets at the magnetopause, precipitating ions in the cusp, and auroras and plasma flows in the ionosphere. Through these modes of experimental study, contrasting evidence has been found.At the magnetopause, intermittent or bursty reconnection manifests as flux transfer events (FTEs) (Russell & Elphic, 1978). Continuous reconnection is often difficult to track, because spacecraft usually cross the magnetopause fleetingly and the crossings are often far apart in time, yet occasionally the spacecraft orbit parallels the magnetopause, permitting nearly continuous observation. Reconnection-accelerated jets have been reported to persist from one to 16 h (

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Section: Potential Drivers Of Reconnection Variabilitysupporting

confidence: 84%

Section: Potential Drivers Of Reconnection Variabilitymentioning

confidence: 67%

Section: Potential Drivers Of Reconnection Variabilitymentioning

confidence: 91%

Section: Potential Drivers Of Reconnection Variabilitymentioning

confidence: 99%

See 2 more Smart Citations

Unsteady Magnetopause Reconnection Under Quasi‐Steady Solar Wind Driving

Zou

Walsh

Chen

et al. 2022

Geophysical Research Letters

Self Cite

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“… 2018 ; Ng et al. 2021 ), or an impulsive penetration may occur when a magnetosheath jet impinges on the magnetopause (Dmitriev and Suvorova 2015 ).…”

Section: Transient Dayside Magnetopause Processes and Transportmentioning

confidence: 99%

Dayside Transient Phenomena and Their Impact on the Magnetosphere and Ionosphere

et al. 2022

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Dayside transients, such as hot flow anomalies, foreshock bubbles, magnetosheath jets, flux transfer events, and surface waves, are frequently observed upstream from the bow shock, in the magnetosheath, and at the magnetopause. They play a significant role in the solar wind-magnetosphere-ionosphere coupling. Foreshock transient phenomena, associated with variations in the solar wind dynamic pressure, deform the magnetopause, and in turn generates field-aligned currents (FACs) connected to the auroral ionosphere. Solar wind dynamic pressure variations and transient phenomena at the dayside magnetopause drive magnetospheric ultra low frequency (ULF) waves, which can play an important role in the dynamics of Earth’s radiation belts. These transient phenomena and their geoeffects have been investigated using coordinated in-situ spacecraft observations, spacecraft-borne imagers, ground-based observations, and numerical simulations. Cluster, THEMIS, Geotail, and MMS multi-mission observations allow us to track the motion and time evolution of transient phenomena at different spatial and temporal scales in detail, whereas ground-based experiments can observe the ionospheric projections of transient magnetopause phenomena such as waves on the magnetopause driven by hot flow anomalies or flux transfer events produced by bursty reconnection across their full longitudinal and latitudinal extent. Magnetohydrodynamics (MHD), hybrid, and particle-in-cell (PIC) simulations are powerful tools to simulate the dayside transient phenomena. This paper provides a comprehensive review of the present understanding of dayside transient phenomena at Earth and other planets, their geoeffects, and outstanding questions.

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