Lower Hybrid Drift Waves: Space Observations

Norgren, Cecilia; Vaivads, A.; Khotyaintsev, Yuri V.; André, Mats

doi:10.1103/physrevlett.109.055001

Cited by 101 publications

(167 citation statements)

References 17 publications

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“…[1][2][3] Indeed, electromagnetic fluctuations in the lower-hybrid frequency range are frequently observed in the vicinity of reconnection sites in both space (e.g., Refs. [4][5][6][7][8][9] and laboratory plasmas (e.g., Refs. [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic instability of thin reconnection layers: Comparison of three-dimensional simulations with MRX observations

et al. 2013

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The influence of current-aligned instabilities on magnetic reconnection in weakly collisional regimes is investigated using experimental observations from Magnetic Reconnection Experiment (MRX) [M. Yamada et al., Phys. Plasmas 4, 1936(1997] and large-scale fully kinetic simulations. In the simulations as well as in the experiment, the dominant instability is localized near the center of the reconnection layer, produces large perturbations of the magnetic field, and is characterized by the wavenumber that is a geometric mean between electron and ion gyroradii k $ ðq e q i Þ À1=2 . However, both the simulations and the experimental observations suggest the instability is not the dominant reconnection mechanism under parameters typical of MRX. V C 2013 AIP Publishing LLC.

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Section: Introductionmentioning

confidence: 99%

Electromagnetic instability of thin reconnection layers: Comparison of three-dimensional simulations with MRX observations

et al. 2013

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“…Figure 7f presents the fluctuations of the electric field in the wave propagation direction (δE k ) and parallel magnetic field (δB || ) with a bandpass filtering for frequencies 10 Hz < f < 300 Hz. Then the wave potential is estimated by B = (B 0 /n e eµ 0 )δB || (Norgren et al, 2012;Divin et al, 2015), which peaks at ∼ 20 eV as shown in Fig. 7g.…”

Section: Observationmentioning

confidence: 99%

Magnetic depression and electron transport in an ion-scale flux rope associated with Kelvin–Helmholtz waves

Tang

Wang

et al. 2018

Ann. Geophys.

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Abstract. We report an ion-scale magnetic flux rope (the size of the flux rope is ∼ 8.5 ion inertial lengths) at the trailing edge of Kelvin-Helmholtz (KH) waves observed by the Magnetospheric Multiscale (MMS) mission on 27 September 2016, which is likely generated by multiple X-line reconnection. The currents of this flux rope are highly filamentary: in the central flux rope, the current flows are mainly parallel to the magnetic field, supporting a local magnetic field increase at about 7 nT, while at the edges the current filaments are predominantly along the antiparallel direction, which induce an opposing field that causes a significant magnetic depression along the axis direction (> 20 nT), meaning the overall magnetic field of this flux rope is depressed compared to the ambient magnetic field. Thus, this flux rope, accompanied by the plasma thermal pressure enhancement in the center, is referred to as a crater type. Intense lower hybrid drift waves (LHDWs) are found at the magnetospheric edge of the flux rope, and the wave potential is estimated to be ∼ 17 % of the electron temperature. Though LHDWs may be stabilized by the mechanism of electron resonance broadening, these waves could still effectively enable diffusive electron transports in the cross-field direction, corresponding to a local density dip. This indicates LHDWs could play important roles in the evolution of crater flux ropes.

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“…When C3 and C4 were at 40 km from each other in the magnetotail in August 2007 (number 11 in Fig. 2), lower hybrid drift waves, a special type of plasma wave that develops in thin boundaries both in space and in the laboratory, were detected and characterised by Norgren et al (2012). These waves were detected at a sharp gradient in density and magnetic field.…”

Section: Plasma Sheet Dynamicsmentioning

confidence: 93%

Recent highlights from Cluster, the first 3-D magnetospheric mission

et al. 2015

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Abstract. The Cluster mission has been operated successfully for 14 years. During this time period, the evolution of the orbit has enabled Cluster to sample many more magnetospheric regions than was initially anticipated. So far, the separation of the Cluster spacecraft has been changed more than 30 times and has ranged from a few kilometres up to 36 000 km. These orbital changes have enabled the science team to address a wide variety of scientific objectives in key regions of Earth's geospace environment: the solar wind and bow shock, the magnetopause, polar cusps, magnetotail, plasmasphere and the auroral acceleration region. Recent results have shed new light on solar wind turbulence. They showed that the magnetosheath can be asymmetric under low Mach number and that it can contain density enhancement that may affect the magnetosphere. The magnetopause was found to be thinner and to have a higher current density on the duskside than on the dawnside. New methods have been used to obtain characteristic of the magnetotail current sheet and high-temporal-resolution measurements of electron pitch angle within flux transfer events (FTEs). Plasmaspheric wind has been discovered, and the refilling of the plasmasphere was observed for the first time over a very wide range of L shells. New models of global electric and magnetic fields of the magnetosphere have been obtained where Cluster, due to its polar orbit, has been essential. Finally, magnetic reconnection was viewed for the first time with high-resolution wave and electron measurements and acceleration of plasma was observed during times of varying rate of magnetic reconnection. The analysis of Cluster data was facilitated by the creation of the Cluster Science Data System (CSDS) and the Cluster Science Archive (CSA). Those systems were implemented to provide, for the first time for a plasma physics mission, a long-term public archive of all calibrated highresolution data from all instruments.

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Lower Hybrid Drift Waves: Space Observations

Cited by 101 publications

References 17 publications

Electromagnetic instability of thin reconnection layers: Comparison of three-dimensional simulations with MRX observations

Electromagnetic instability of thin reconnection layers: Comparison of three-dimensional simulations with MRX observations

Magnetic depression and electron transport in an ion-scale flux rope associated with Kelvin–Helmholtz waves

Recent highlights from Cluster, the first 3-D magnetospheric mission

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