KINETIC TURBULENCE IN THE TERRESTRIAL MAGNETOSHEATH:
                    <i>CLUSTER</i>
                    OBSERVATIONS

Huang, Suming; Sahraoui, Fouad; Deng, Xiaohua; He, Jie; Yuan, Zhigang; Zhou, Meng; Pang, Y.; Fu, H. S.

doi:10.1088/2041-8205/789/2/l28

Cited by 93 publications

(111 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Note that other physical effects such as Landau damping Sulem et al 2016)) and intermittency corrections associated with coherent structures, such as current sheets (Boldyrev et al 2013), can also lead to steeper spectra. It should be stressed that both phenomenological arguments and numerical simulations predict a transition at d e , while observational spectra in the terrestrial magnetosheath only display a transition at ρ e (Huang et al 2014), associated with electron demagnetization. In fact, a transition at d e is more clearly observed at the level of the magnetic compressibility (Chen & Boldyrev 2017).…”

Section: Resultsmentioning

confidence: 98%

Electron-scale reduced fluid models with gyroviscous effects

2017

View full text Add to dashboard Cite

Reduced fluid models for collisionless plasmas including electron inertia and finite Larmor radius corrections are derived for scales ranging from the ion to the electron gyroradii. Based either on pressure balance or on the incompressibility of the electron fluid, they respectively capture kinetic Alfvén waves (KAWs) or whistler waves (WWs), and can provide suitable tools for reconnection and turbulence studies. Both isothermal regimes and Landau fluid closures permitting anisotropic pressure fluctuations are considered. For small values of the electron beta parameter β e , a perturbative computation of the gyroviscous force valid at scales comparable to the electron inertial length is performed at order O(β e ), which requires second-order contributions in a scale expansion. Comparisons with kinetic theory are performed in the linear regime. The spectrum of transverse magnetic fluctuations for strong and weak turbulence energy cascades is also phenomenologically predicted for both types of waves. In the case of moderate ion to electron temperature ratio, a new regime of KAW turbulence at scales smaller than the electron inertial length is obtained, where the magnetic energy spectrum decays like k −13/3 ⊥ , thus faster than the k −11/3 ⊥ spectrum of WW turbulence.

show abstract

Section: Resultsmentioning

confidence: 98%

Electron-scale reduced fluid models with gyroviscous effects

2017

View full text Add to dashboard Cite

show abstract

“…Note that when such a separation is not performed (e.g. Huang et al 2014), some care must probably be used in the interpretation of the results. Moreover, while the example shown in Fig.…”

Section: Discussionmentioning

confidence: 99%

“…Spectra of the magnetic field from MHD to sub-ion scales in the magnetosheath have been reported by Alexandrova, Lacombe & Mangeney (2008a) using the Cluster spacecraft, and on kinetic scales by e.g. Sundkvist et al (2007) and Huang et al (2014); see also Zimbardo et al (2010) for a review on magnetic turbulence in this region. Properties of electric and magnetic spectra between ion and electron scales have been previously studied by Mangeney et al (2006) and Lacombe et al (2006), confirming that this regime can be well resolved in the magnetosheath using Cluster.…”

Section: Introductionmentioning

confidence: 99%

Electric and magnetic spectra from MHD to electron scales in the magnetosheath

Matteini

Alexandrova

Chen

et al. 2016

Mon. Not. R. Astron. Soc.

View full text Add to dashboard Cite

We investigate the transition of the turbulence from large to kinetic scales using Cluster observations. Simultaneous spectra of magnetic and electric fields in the Earth's magnetosheath from magnetohydrodynamic (MHD) to electron scales are presented for the first time. While the two spectra have approximatively similar behaviour in the fluid-MHD regime, they show different trends in the kinetic range. As the magnetic field spectrum steepens at ion scales, the electric field spectrum is characterized by a shallower power law continuing down to electron scales. Such an evolution is consistent with theoretical expectations, assuming that the turbulence is dominated by highly oblique k-vectors and that between ion and electron scales the electric field is governed by the non-ideal terms in the generalized Ohm's law. This leads to an expected linear increase of the electric-to-magnetic ratio of fluctuations, consistent with observations presented here. The influence of local whistler wave activity on electron-scale spectra is also discussed.

show abstract

“…Major differences with the solar wind do exist, however, e.g., (i) magnetosheath turbulence evolves in a 'confined' space limited by the bow shock and the magnetopause and these boundaries may influence the anisotropy of the turbulence (Sahraoui et al 2006;Yordanova et al 2008), and, (ii) in contrast to the solar wind, the fluctuations are dominated by zero-frequency compressible fluctuations (e.g., mirror modes Sahraoui et al 2006). In a recent large survey of STAFF waveform data obtained in the magnetosheath, Huang et al (2014) quantified the differences in spectral slopes found in the solar wind and magnetosheath in the magnetic energy spectra between the ion and electrons scales (see Fig. 20).…”

Section: Electron Scale Turbulencementioning

confidence: 99%

“…On the other hand, the slopes at the electron break in the two regions were generally steeper in the magnetosheath where the distribution peaks near −5.5 and slopes can be as steep as −7. A possible explanation of this discrepancy was suggested by Huang et al (2014) based on the differences in the (Kintner and Seyler 1985;Sundkvist et al 2005), shear flows (Tajima et al 1991;Rankin et al 1997), magnetic bubbles (Birn et al 2004), and reconnection (Matthaeus 1982;Matthaeus and Lamkin 1985;Hwang et al 2013). It was only with the launch of Cluster that the ability to measure directly local vorticity became possible (albeit only by using moments of the electron distribution function) by computing the spatial variation in the velocity within the volume defined by the Cluster spacecraft (see Sec.…”

Section: Electron Scale Turbulencementioning

confidence: 99%

Multipoint observations of plasma phenomena made in space by Cluster

et al. 2015

Self Cite

View full text Add to dashboard Cite

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.

show abstract

KINETIC TURBULENCE IN THE TERRESTRIAL MAGNETOSHEATH: CLUSTER OBSERVATIONS

Cited by 93 publications

References 40 publications

Electron-scale reduced fluid models with gyroviscous effects

Electron-scale reduced fluid models with gyroviscous effects

Electric and magnetic spectra from MHD to electron scales in the magnetosheath

Multipoint observations of plasma phenomena made in space by Cluster

Contact Info

Product

Resources

About