Investigating the Role of Magnetosheath High‐Speed Jets in Triggering Dayside Ground Magnetic Ultra‐Low Frequency Waves

Wang, B.; Nishimura, Y.; Hietala, Heli; Angelopoulos, Vassilis

doi:10.1029/2022gl099768

Cited by 15 publications

(11 citation statements)

References 56 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, due to the small MLT‐coverage of IMAGE stations, the MLT‐dependence in the ground‐based magnetometer data is absence (e.g., Figure 6b). Foreshock transients (e.g., Eastwood et al., 2008; Zhang et al., 2022) like the hot flow presented in Figure 5 or magnetosheath structures such as high‐speed jets (e.g., B. Wang et al., 2022) could be potential sources for the impulses.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Ion Acceleration and Corresponding Bounce Echoes Induced by Electric Field Impulses: MMS Observations

Li,

Liu,

Zong

et al. 2024

JGR Space Physics

View full text Add to dashboard Cite

Dayside magnetosphere interactions are essential for energy and momentum transport between the solar wind and the magnetosphere. In this study, we investigate a new phenomenon within this regime. Sudden enhancements of ion fluxes followed by repeating dropouts and recoveries were observed by Magnetospheric Multiscale on 5 November 2016, which is the very end of the recovery phase from a moderate geomagnetic storm. These repetitive flux variations display energy‐dispersive characteristics with periods relevant to ion bounce motion, suggesting they are corresponding echoes. Alongside the flux variations, bipolar electric field impulses originating from external sources were detected. We traced the source region of the initial injection and found it is located near the spacecraft's position. To elucidate the underlying physics, a test‐particle simulation is conducted. The results reveal that radial transport resulting from impulse‐induced acceleration can give rise to these echoes. Observations demonstrate dayside magnetosphere interactions are more common than we previously considered, which warrants further research.

show abstract

Section: Resultsmentioning

confidence: 99%

“…Foreshock transients (e.g., Eastwood et al, 2008;Zhang et al, 2022) like the hot flow presented in Figure 5 or magnetosheath structures such as high-speed jets (e.g., B. Wang et al, 2022) could be potential sources for the impulses.…”

Section: Observationsmentioning

confidence: 99%

Ion Acceleration and Corresponding Bounce Echoes Induced by Electric Field Impulses: MMS Observations

Li,

Liu,

Zong

et al. 2024

JGR Space Physics

View full text Add to dashboard Cite

show abstract

“…In a recent study, Wang et al. ( 2022 ) reported that jets can trigger ultra low frequency ground waves. It is expected that jets occur at other planetary and astrophysical bow shocks, see for example, Karlsson et al.…”

Section: Introductionmentioning

confidence: 99%

“…Ionospheric flow enhancements have been also associated to jets (Hietala et al, 2012;Ng et al, 2021), and a study by Han et al (2017) has suggested that dayside auroras known as "throat" auroras may be caused by jet interaction with the magnetopause. In a recent study, Wang et al (2022) reported that jets can trigger ultra low frequency ground waves. It is expected that jets occur at other planetary and astrophysical bow shocks, see for example, Karlsson et al (2016) who studied jets in Mercury's environment.…”

mentioning

confidence: 99%

Jets and Mirror Mode Waves in Earth's Magnetosheath

et al. 2023

View full text Add to dashboard Cite

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.

show abstract

“…There can be several causes for ULF pulsations, all of which are not always directly associated with established ionospheric current systems such as the ones discussed above. They can, for example, be caused by rapid compressions of the magnetosphere (sudden impulses) (e.g., Shi et al., 2013) and by magnetosheath jets impacting the magnetopause (e.g., Archer et al., 2013; Norenius et al., 2021; Wang et al., 2022). In the first case, it is primarily current systems associated with the magnetopause and the ring current that are affected, while in the latter case, ionospheric currents can be directly affected, for example, in the generation of ionospheric auroral features such as traveling convection vortices (TCVs) (Archer et al., 2013) and throat auroras (Han et al., 2015).…”

Section: Introductionmentioning

confidence: 99%

Space Weather Disturbances in Non‐Stormy Times: Occurrence of dB/dt Spikes During Three Solar Cycles

Hamrin,

Schillings,

Opgenoorth

et al. 2023

JGR Space Physics

View full text Add to dashboard Cite

Spatio‐temporal variations of ionospheric currents cause rapid magnetic field variations at ground level and Geomagnetically Induced Currents (GICs) that can be harmful for human infrastructure. The risk for large excursions in the magnetic field time derivative, “dB/dt spikes”, is known to be high during geomagnetic storms and substorms. However, less is known about the occurrence of spikes during non‐stormy times. We use data from ground‐based globally covering magnetometers (SuperMAG database) from the years 1985–2021. We investigate the spike occurrence (|dB/dt| > 100 nT/min) as a function of magnetic local time (MLT), magnetic latitude (Mlat), and the solar cycle phases during non‐stormy times (−15 nT ≤ SYM‐H < 0). We sort our data into substorm (AL < 200 nT) intervals (“SUB”) and less active intervals between consecutive substorms (“nonSUB”). We find that spikes commonly occur in both SUBs and nonSUBs during non‐stormy times (3–23 spikes/day), covering 18–12 MLT and 65°–80° Mlat. This also implies a risk for infrastructure damage during non‐stormy times, especially when several spikes occur nearby in space and time, possibly causing infrastructure weathering. We find that spikes are more common in the declining phase of the solar cycle, and that the occurrence of SUB spikes propagates from one midnight to one morning hotspot with ∼10 min in MLT for each minute in universal time (UTC). Finally, we discuss causes for the spikes in terms of spatio‐temporal variations of ionospheric currents.

show abstract

Investigating the Role of Magnetosheath High‐Speed Jets in Triggering Dayside Ground Magnetic Ultra‐Low Frequency Waves

Cited by 15 publications

References 56 publications

Ion Acceleration and Corresponding Bounce Echoes Induced by Electric Field Impulses: MMS Observations

Ion Acceleration and Corresponding Bounce Echoes Induced by Electric Field Impulses: MMS Observations

Jets and Mirror Mode Waves in Earth's Magnetosheath

Space Weather Disturbances in Non‐Stormy Times: Occurrence of dB/dt Spikes During Three Solar Cycles

Contact Info

Product

Resources

About