Kinetic structure and wave properties associated with sharp dipolarization front observed by Cluster

Huang, Suming; Zhou, Meng; Deng, Xiaohua; Yuan, Zhigang; Pang, Y.; Wei, Qianqian; Su, Wen-Qing; Li, H. M.; Wang, Q. Q.

doi:10.5194/angeo-30-97-2012

Cited by 135 publications

(178 citation statements)

References 44 publications

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“…A number of case studies [Le Contel et al, 2009;Deng et al, 2010;Khotyaintsev et al, 2011;Huang et al, 2012] reported observations of whistlers in relation to DFs. In particular, they found whistlers in the magnetic flux pileup region (FPR), where the electron distribution has a perpendicular anisotropy, which is large enough to drive whistlers via the whistler anisotropy instability [Le Contel et al, 2009].…”

Section: Introductionmentioning

confidence: 99%

Whistler mode waves at magnetotail dipolarization fronts

et al. 2014

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We report the statistics of whistler mode waves observed in relation to dipolarization fronts (DFs) in Earth's magnetotail using data from the four Cluster spacecraft spanning a period of 9 years, 2001-2009. We show that whistler mode waves are common in a vicinity of DFs: between 30 and 60% of all DFs are associated with whistlers. Whistlers are about 7 times more likely to be observed near a DF than at any random location in the magnetotail. Therefore, whistlers are a characteristic signature of DFs. We find that whistlers are most often detected in the flux pileup region (FPR) following the DF, close to the center of the current sheet (B x ∼ 0) and in association with anisotropic electron distributions (T ⟂ > T ∥ ). This suggests that we typically observe emissions in the source region where they are generated by the anisotropic electrons produced by the betatron process inside the FPR.

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Section: Introductionmentioning

confidence: 99%

Whistler mode waves at magnetotail dipolarization fronts

et al. 2014

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“…The term dipolarization front was first proposed by Nakamura et al [6] when studying the motion of a DF during a flow burst event and has since been studied extensively, both statistically [7,8] and in multicase analysis [9,10]. Observations have shown that DFs are earthward-propagating structures with thicknesses comparable to ion gyroradii and are usually associated with large amplitude transient electric fields [8,11,12], waves [13][14][15], and electric current systems [8,12,16].…”

Section: Introductionmentioning

confidence: 99%

Ion flux dropout observed near dipolarization front

et al. 2014

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An ion flux dropout near the dipolarization front (DF) at around X GSM = -11 R E in the Earth's plasma sheet was observed by Time History of Events and Macroscale Interaction during substorms (THEMIS) on March 31, 2009. The ion differential energy fluxes at energies from 450 eV to 150 keV measured by the ESA and SST instruments from THC began to decrease about 2 s before the detection of the DF and reached a local minimum 6 s later. Then, the ion fluxes gradually increased to form a dropout around the DF. The spatial extent of the dropout was about 4,000 km. For energies above 20 keV, the ion fluxes after the dropout are greater than those before it, contrary to the fluxes at energies below 20 keV. The associated ion density variation indicates that the ion flux dropout coincides with the ion density dropout. Taking advantage of multipoint observations, THD, THC, and THE detected the same DF consecutively. Only THC detected an obvious ion flux dropout; THD observed an indistinct one about 2 s before THC; no high-energy (E [ 30 keV) ion flux dropout was observed by THE. Our study suggests that the ion flux dropout may evolve with the earthward-propagating DF, and its properties can depend on locations relative to the DF.

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“…Behind the fronts, active wave emissions in the whistler frequency range are observed (Deng et al 2010a,b;Hwang et al 2011a;Huang et al 2012;Hwang et al 2014a;Viberg et al 2014). Deng et al (2010b) and Huang et al (2012) attributed the generation of the whistler waves to the electron temperature anisotropy (T ⊥ > T || ) caused by the pileup of the magnetic field lines, similar to the whistlers observed in the downstream region of the reconnection jet (Fujimoto and Sydora 2008).…”

Section: Betatron and Stochastic Accelerationmentioning

confidence: 89%

“…These wave emissions often appear to be coincident with the magnetic field maxima, being possibly related to changes in electron gyromotion occasioned by the increased magnetic strength. Huang et al (2012) showed wave activity near the ion cyclotron frequency that arose from an Alfvén ion cyclotron instability driven by the cross-field ion drift in the front layer of a DF.…”

Section: Betatron and Stochastic Accelerationmentioning

confidence: 99%

Multipoint observations of plasma phenomena made in space by Cluster

et al. 2015

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Plasmas are ubiquitous in nature, surround our local geospace environment, and permeate the universe. Plasma phenomena in space give rise to energetic particles, the aurora, solar flares and coronal mass ejections, as well as many energetic phenomena in interstellar space. Although plasmas can be studied in laboratory settings, it is often difficult, if not impossible, to replicate the conditions (density, temperature, magnetic and electric fields, etc.) of space. Single-point space missions too numerous to list have described many properties of near-Earth and heliospheric plasmas as measured both in situ and remotely (see http://www.nasa.gov/missions/#.U1mcVmeweRY for a list of NASA-related missions). However, a full description of our plasma environment requires three-dimensional spatial measurements. Cluster is the first, and until data begin flowing from the Magnetospheric Multiscale Mission (MMS), the only mission designed to describe the three-dimensional spatial structure of plasma phenomena in geospace. In this paper, we concentrate on some of the many plasma phenomena that have been studied using data from Cluster. To date, there have been more than 2000 refereed papers published using Cluster data but in this paper we will, of necessity, refer to only a small fraction of the published work. We have focused on a few basic plasma phenomena, but, for example, have not dealt with most of the vast body of work describing dynamical phenomena in Earth's magnetosphere, including the dynamics of current sheets in Earth's magnetotail and the morphology of the dayside high latitude cusp. Several review articles and special publications are available that describe aspects of that research in detail and interested readers are referred to them (see for example, Escoubet et al.

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Kinetic structure and wave properties associated with sharp dipolarization front observed by Cluster

Cited by 135 publications

References 44 publications

Whistler mode waves at magnetotail dipolarization fronts

Whistler mode waves at magnetotail dipolarization fronts

Ion flux dropout observed near dipolarization front

Multipoint observations of plasma phenomena made in space by Cluster

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