Slow mode transition in the frontside magnetosheath

Song, P.; Russell, C. T.; Thomsen, M. F.

doi:10.1029/92ja00381

Cited by 172 publications

(173 citation statements)

References 21 publications

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“…These simulations bear a remarkable resemblance to the observations of the slow-mode transition by Song et al (1992a). The question of whether there are any observations of modes matching more closely slow-mode wave trains remains an open one.…”

Section: Mirror Modesmentioning

confidence: 71%

“…Each such nonlinear front can amplify or modify the waves passing through it. There is some evidence for a standing slow mode structure (Song et al, 1992a). The detection of slow mode waves, which should be heavily Landau damped in the high magnetosheath plasma, downstream of this transition is less conclusive at this stage.…”

Section: The Magnetopause Itselfmentioning

confidence: 99%

“…However, along the stagnation line the bulk flow clearly drops below the slow mode speed. A standing slow mode front is expected and observed (Song et al, 1992a;Song et al, 1995;Southwood and Kivelson, 1992;Yan and Lee, 1994). Thus, the magnetopause is clearly capable of generating a slow mode disturbance of some kind, although a single standing front (shock?)…”

Section: Mirror Modesmentioning

confidence: 99%

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Low-frequency waves in the Earth's magnetosheath: present status

1996

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Abstract. The terrestrial magnetosheath contains a rich variety of low-frequency (: proton gyrofrequency) fluctuations. Kinetic and fluid-like processes at the bow shock, within the magnetosheath plasma, and at the magnetopause all provide sources of wave energy. The dominance of kinetic features such as temperature anisotropies, coupled with the high-conditions, complicates the wave dispersion and variety of instabilities to the point where mode identification is difficult. We review here the observed fluctuations and attempts to identify the dominant modes, along with the identification tools. Alfve´n/ioncyclotron and mirror modes are generated by ¹ ,

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Section: Mirror Modesmentioning

confidence: 71%

Section: The Magnetopause Itselfmentioning

confidence: 99%

Section: Mirror Modesmentioning

confidence: 99%

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Low-frequency waves in the Earth's magnetosheath: present status

1996

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“…The second kind of tube is just convected downstream with the ambient plasma. This is a possible qualitative explanation of the existence of slow modes of the enhanced plasma pressure and density in the subsolar magnetosheath, which look similar to the socalled "slow mode transition regions" observed in the magnetosheath (Song et al, 1992).…”

Section: Discussionmentioning

confidence: 85%

“…Gradients of perturbations of the magnetic field, plasma pressure, and density are increasing very strongly while the perturbations are being convected towards the magnetopause. In particular, this can be the reason for slow mode perturbations observed in the magnetosheath (Song et al, 1992). The variation of the IMF from north to south brings about a transition current layer which is convecting from the bow shock towards the magnetopause.…”

Section: A Current Layer Moving From the Bow Shock Towards The Magnetmentioning

confidence: 99%

Interchange instability of a curved current layerconvecting in the magnetosheath from the bow shock towards themagnetopause

2004

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Abstract. This paper deals with nonsteady perturbations of the magnetosheath parameters which are related to variations of the interplanetary magnetic field from north to south under a constant solar wind dynamic pressure. The magnetic field changes its direction within a thin layer which is convected with the plasma from the bow shock to the ionopause. In the course of time, this current layer is amplified during its motion towards the magnetopause. The intensity of the current is increasing, the layer thickness is decreasing, and the gradients of parameters are becoming much sharper while the layer is approaching the magnetopause. The curvature radius of this layer is decreasing while it is draping around the magnetopause. This curved layer structure with reversed magnetic field in the magnetosheath is found to be unstable with respect to the interchange instability. The growth rate of the instability is obtained for different positions of the layer.

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Slow mode structure in the nightside magnetosheath related to IMF draping

et al. 2014

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We apply a semianalytic magnetohydrodynamic approach to describe effects in the nightside magnetosheath related to accelerated magnetosheath flows caused by the draping of interplanetary magnetic field (IMF). Assuming a northward IMF direction, we show the development of slow mode fronts in the far tail (tailward of approximately −60 R m E). We find that accelerated flows north and south of the equator start to converge toward lower latitudes. The ensuing plasma compression gives rise to slow mode waves in the equatorial region which, further down the tail, evolve into slow mode shocks. These fronts propagating along the magnetic field lines are characterized by sharp increases of plasma density, pressure, and temperature and a decrease in the magnetic field strength. The magnetic pressure exhibits an anticorrelation with the plasma pressure, but the total pressure is fairly constant across the fronts. The field-aligned plasma velocity component anticorrelates with the plasma density, while the perpendicular velocity component does not have sharp variations at the fronts. For northward IMF, these fronts appear near the equatorial region and then propagate to higher latitudes. This effect is not very sensitive to the particular shape of the magnetopause. Lowering the upstream Alfvén Mach number increases the strength of the slow mode waves, which also develop closer to Earth. We predict that this effect can be observed by space probes skimming the far tail.

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Slow mode transition in the frontside magnetosheath

Cited by 172 publications

References 21 publications

Low-frequency waves in the Earth's magnetosheath: present status

Low-frequency waves in the Earth's magnetosheath: present status

Interchange instability of a curved current layerconvecting in the magnetosheath from the bow shock towards themagnetopause

Slow mode structure in the nightside magnetosheath related to IMF draping

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