Electron-scale sheets of whistlers close to the magnetopause

Stenberg, G.; Oscarsson, T.; André, Mats; Vaivads, A.; Cornilleau‐Wehrlin, N.; Fazakerley, A. N.; Lavraud, B.; Décréau, Pierrette

doi:10.5194/angeo-23-3715-2005

Cited by 16 publications

(37 citation statements)

References 47 publications

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“…This event is extensively presented in Stenberg et al (2005), and at first sight very similar to the event just discussed; waves in the whistler-mode frequency range are detected within a boundary region on the magnetospheric side of the magnetopause boundary. The particle data reveal a mixture of magnetospheric and magnetosheath plasma.…”

Section: Boundary Layer Whistlersmentioning

confidence: 92%

“…The particle data reveal a mixture of magnetospheric and magnetosheath plasma. The reader is referred to Stenberg et al (2005) for details and figures corresponding to Fig. 1.…”

Section: Boundary Layer Whistlersmentioning

confidence: 99%

“…At 100 Hz this corresponds to a wavelength of 100 km. We note that a corresponding analysis for the March 2-event is performed in Stenberg et al (2005), where the parallel wavelength is found to be about 50-200 km at 100 Hz. In that case the whistler waves instead propagates anti-parallel to the ambient magnetic field.…”

Section: Wave Properties and Generation Regionsmentioning

confidence: 99%

“…In this paper we examine the whistler wave-sheets reported by Stenberg et al (2005) in closer detail. In particular, we determine the extension of these sheets in all three spatial dimensions and we investigate the internal structure of the presumed wave generating regions.…”

Section: Introductionmentioning

confidence: 99%

“…André et al, 2004;Vaivads et al, 2004b andRetinò et al, 2006). Stenberg et al (2005) show that whistler mode waves observed in the boundary layer on the magnetospheric side of the magnetopause are generated in thin (electron-scale) sheets. Furthermore, they suggest that although the sheets of whistler waves are observed thousands of kilometers from the magnetopause, they are still directly related to the diffusion region.…”

Section: Introductionmentioning

confidence: 99%

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Internal structure and spatial dimensions of whistler wave regions in the magnetopause boundary layer

et al. 2007

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Abstract. We use whistler waves observed close to the magnetopause as an instrument to investigate the internal structure of the magnetopause-magnetosheath boundary layer. We find that this region is characterized by tube-like structures with dimensions less than or comparable with an ion inertial length in the direction perpendicular to the ambient magnetic field. The tubes are revealed as they constitute regions where whistler waves are generated and propagate. We believe that the region containing tube-like structures extend several Earth radii along the magnetopause in the boundary layer. Within the presumed wave generating regions we find current structures moving at the whistler wave group velocity in the same direction as the waves.

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Section: Boundary Layer Whistlersmentioning

confidence: 92%

“…The particle data reveal a mixture of magnetospheric and magnetosheath plasma. The reader is referred to Stenberg et al (2005) for details and figures corresponding to Fig. 1.…”

Section: Boundary Layer Whistlersmentioning

confidence: 99%

Section: Wave Properties and Generation Regionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Internal structure and spatial dimensions of whistler wave regions in the magnetopause boundary layer

et al. 2007

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Wave normal angles of whistler mode chorus rising and falling tones

et al. 2014

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We present a study of wave normal angles (θk) of whistler mode chorus emission as observed by Time History of Events and Macroscale Interactions during Substorms (THEMIS) during the year 2008. The three inner THEMIS satellites THA, THD, and THE usually orbit Earth close to the dipole magnetic equator (±20°), covering a large range of L shells from the plasmasphere out to the magnetopause. Waveform measurements of electric and magnetic fields enable a detailed polarization analysis of chorus below 4 kHz. When displayed in a frequency‐θk histogram, four characteristic regions of occurrence are evident. They are separated by gaps at f/fc,e≈0.5 (f is the chorus frequency, fc,e is the local electron cyclotron frequency) and at θk∼40°. Below θk∼40°, the average value for θk is predominantly field aligned, but slightly increasing with frequency toward half of fc,e (θk up to 20°). Above half of fc,e, the average θk is again decreasing with frequency. Above θk∼40°, wave normal angles are usually close to the resonance cone angle. Furthermore, we present a detailed comparison of electric and magnetic fields of chorus rising and falling tones. Falling tones exhibit peaks in occurrence solely for θk>40° and are propagating close to the resonance cone angle. Nevertheless, when comparing rising tones to falling tones at θk>40°, the ratio of magnetic to electric field shows no significant differences. Thus, we conclude that falling tones are generated under similar conditions as rising tones, with common source regions close to the magnetic equatorial plane.

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Whistler emission in the separatrix regions of asymmetric magnetic reconnection

et al. 2016

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At Earth's dayside magnetopause asymmetric magnetic reconnection occurs between the cold dense magnetosheath plasma and the hot tenuous magnetospheric plasma, which differs significantly from symmetric reconnection. During magnetic reconnection the separatrix regions are potentially unstable to a variety of instabilities. In this paper observations of the separatrix regions of asymmetric reconnection are reported as Cluster crossed the magnetopause near the subsolar point. The small relative motion between the spacecraft and plasma allows spatial changes of electron distributions within the separatrix regions to be resolved over multiple spacecraft spins. The electron distributions are shown to be unstable to the electromagnetic whistler mode and the electrostatic beam mode. Large‐amplitude whistler waves are observed in the magnetospheric and magnetosheath separatrix regions, and outflow region. In the magnetospheric separatrix regions the observed whistler waves propagate toward the X line, which are shown to be driven by the loss in magnetospheric electrons propagating away from the X line and are enhanced by the presence of magnetosheath electrons. The beam mode waves are predicted to be produced by beams of magnetosheath electrons propagating away from the X line and potentially account for some of the electrostatic fluctuations observed in the magnetospheric separatrix regions.

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Electron-scale sheets of whistlers close to the magnetopause

Cited by 16 publications

References 47 publications

Internal structure and spatial dimensions of whistler wave regions in the magnetopause boundary layer

Internal structure and spatial dimensions of whistler wave regions in the magnetopause boundary layer

Wave normal angles of whistler mode chorus rising and falling tones

Whistler emission in the separatrix regions of asymmetric magnetic reconnection

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