Cluster observations of fast magnetosonic waves in the heliosphere current sheet

Dai, Lei; Wygant, J. R.; Cattell, C. A.; Thaller, S. A.; Kersten, K.; Breneman, A. W.; Tang, Xiangwei

doi:10.1002/2014gl059223

Cited by 10 publications

(7 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the upstream solar wind, the Curlometer has also been used to determine J in current sheets on a variety of scales, as well as through the heliospheric current sheet (Dai et al., 2014; Eastwood et al., 2002), and at the quasi‐perpendicular bow shock, the method has also enabled the investigation of the cross shock electric field (Eastwood et al., 2007), and other large scale structures, as well as for intense current sheets (Artemyev, Pritchett, et al., 2018; Artemyev, Anton, et al., 2018). Thin current sheets have also been seen in the magnetosheath (Chasapis et al., 2015; Yordanova et al., 2016).…”

Section: Application By Regionsmentioning

confidence: 99%

Curlometer Technique and Applications

Dunlop

Dong²,

Wang³

et al. 2021

JGR Space Physics

View full text Add to dashboard Cite

We review the range of applications and use of the curlometer, initially developed to analyze Cluster multi‐spacecraft magnetic field data; but more recently adapted to other arrays of spacecraft flying in formation, such as MMS small‐scale, 4‐spacecraft configurations; THEMIS close constellations of 3–5 spacecraft, and Swarm 2–3 spacecraft configurations. Although magnetic gradients require knowledge of spacecraft separations and the magnetic field, the structure of the electric current density (for example, its relative spatial scale), and any temporal evolution, limits measurement accuracy. Nevertheless, in many magnetospheric regions the curlometer is reliable (within certain limits), particularly under conditions of time stationarity, or with supporting information on morphology (for example, when the geometry of the large scale structure is expected). A number of large‐scale regions have been covered, such as: the cross‐tail current sheet, ring current, the current layer at the magnetopause and field‐aligned currents. Transient and smaller scale current structures (e.g., reconnected flux tube or dipolarisation fronts) and energy transfer processes. The method is able to provide estimates of single components of the vector current density, even if there are only two or three satellites flying in formation, within the current region, as can be the case when there is a highly irregular spacecraft configuration. The computation of magnetic field gradients and topology in general includes magnetic rotation analysis and various least squares approaches, as well as the curlometer, and indeed the added inclusion of plasma measurements and the extension to larger arrays of spacecraft have recently been considered.

show abstract

Section: Application By Regionsmentioning

confidence: 99%

Curlometer Technique and Applications

Dunlop

Dong²,

Wang³

et al. 2021

JGR Space Physics

View full text Add to dashboard Cite

show abstract

“…The intense electric fields are one of the important factors affecting relativistic electron injections in the outer radiation belt. Previous studies have shown that the intense substorm electric fields or enhanced transient electric fields could accelerate injected electrons in the outer radiation belt (e.g., Mithaiwala and Horton, 2005;Gabrielse et al, 2012;Dai L et al, 2014Dai L et al, , 2015Tang CL et al, 2016b). Besides, some other factors (the characteristics of the injection region before electron injections and the source populations) may affect ~ 600 keV electron injections in the outer radiation belt.…”

Section: Discussion and Summarymentioning

confidence: 99%

“…Previous observations have shown that energetic electrons in the mid-tail or the near-Earth magnetotail during geomagnetic activities are the source population of injected MeV electrons in the outer radiation belt (e.g., Taylor et al, 2004;Lui ATY et al, 2012;Dai L et al, 2014;Tang CL et al, 2016b). During the injection of energetic electrons, these electrons moved earthward and entered the region of a stronger magnetic field (mainly the Bz component, as shown in Tverskoy (1969)).…”

Section: Discussion and Summarymentioning

confidence: 99%

The 600 keV electron injections in the Earth’s outer radiation belt: A statistical study

Tang¹,

Wang²,

Ni³

et al. 2022

Earth and Planetary Physics

View full text Add to dashboard Cite

1. 600 keV electron injections are observed at 4.5 < L < 6.4 under different geomagnetic conditions of 450 nT < AE < 1450 nT.2. Before the electron injections, the flux negative L shell gradient for ≤ 0.6 MeV electrons or the low electron fluxes in the injected region are observed.3. For 600 keV electron injections at different L shells, the source populations from the Earth's 1 plasma sheet are different.

show abstract

“…The resonance energy and free energy for n =0 and n =±1 resonance in the events is summarized in the schematic Figure i. The n =0 resonance velocity v ‖ = ω / k ‖ is estimated through the Maxwell equation from the perpendicular wave field as

ω false/ k_{‖} = \frac{false| δ E_{⊥} false|}{false| δ B_{⊥} false|}

(e.g., Dai et al, ). The root‐mean‐square of the field with a 0.05‐s window has been used to compute the wave amplitude.…”

Section: Observations and Analysismentioning

confidence: 99%

Whistler Waves Driven by Field‐Aligned Streaming Electrons in the Near‐Earth Magnetotail Reconnection

Ren

Dai

et al. 2019

Geophysical Research Letters

View full text Add to dashboard Cite

We analyze Magnetospheric Multiscale Mission observations of whistler waves and associated electron field‐aligned crescent distribution in the vicinity of the magnetotail near‐Earth X‐line. The whistler waves propagate outward from the X‐line in the neutral sheet. The associated field‐aligned streaming electrons exhibit a crescent‐like shape, with an inverse slope (df/d|v|||>0) at 1–5 keV. The parallel phase velocity of the waves is in the range (1–5 keV) of the inverse slope of the field‐aligned crescents in the velocity space. We demonstrate that the observed whistler waves are driven by the electron field‐aligned crescents through Landau resonance. The cyclotron resonance is at the high‐energy tail with negligible free energy of pitch angle anisotropy in these events.

show abstract

Cluster observations of fast magnetosonic waves in the heliosphere current sheet

Cited by 10 publications

References 36 publications

Curlometer Technique and Applications

Curlometer Technique and Applications

The 600 keV electron injections in the Earth’s outer radiation belt: A statistical study

Whistler Waves Driven by Field‐Aligned Streaming Electrons in the Near‐Earth Magnetotail Reconnection

Contact Info

Product

Resources

About