Aspects of magnetopause/magnetosphere response to interplanetary discontinuities, and features of magnetopause Kelvin–Helmholtz waves

Farrugia, Charles J.; Gratton, F. T.

doi:10.1016/j.jastp.2009.10.008

Cited by 11 publications

(20 citation statements)

References 48 publications

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“…(3) we use results from (Spreiter et al, 1966). The importance of the inertia for the problem was recognized also in other studies (Smit, 1968;Freeman et al, 1995). The numerical studies (Spreiter et al, 1966) indicate that typical values are D ≈ R/4 (consistent with observations by e.g.…”

Section: Oscillations Without Dampingsupporting

confidence: 72%

“…Correspondence to: H. L. Pécseli (hans.pecseli@fys.uio.no) In a recent publication (Farrugia and Gratton, 2011) it was demonstrated that such SI-events are followed by large amplitude oscillations of ∼5 min periods. These are observed, for instance, by satellites in the cold, dense magnetosheath and in the hot and tenuous magnetosphere plasmas, consistent with other related observations (Plaschke et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

“…Other models consider waves propagating in the equatorial plane between the flanks of the bow shock and a turning point deep within the magnetosphere . Another approach considers the magnetopause surface analogous to an elastic membrane, obtaining its natural modes of oscillation (Freeman et al, 1995).…”

Section: Introductionmentioning

confidence: 99%

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Minute-scale period oscillations of the magnetosphere

et al. 2011

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Abstract.Oscillations with periods on the order of 5-10 min have been observed by instrumented spacecrafts in the Earth's magnetosphere. These oscillations often follow sudden impacts related to coronal mass ejections. It is demonstrated that a simple model is capable of explaining these oscillations and give a scaling law for their basic characteristics in terms of the basic parameters of the problem. The period of the oscillations and their anharmonic nature, in particular, are accounted for. The model has no free adjustable numerical parameters. The results agree well with observations. The analysis is supported by numerical simulations solving the Magneto-Hydro-Dynamic (MHD) equations in two spatial dimensions, where we let a solar wind interact with a magnetic dipole representing a magnetized Earth. We consider two tilt-angles of the magnetic dipole axis. We find the formation of a magnetosheath with the magnetopause at a distance corresponding well to the analytical results. Sudden pulses in the model solar wind sets the model magnetosphere into damped oscillatory motions and quantitatively good agreement with the analytical results is achieved.

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Section: Oscillations Without Dampingsupporting

confidence: 72%

Section: Introductionmentioning

confidence: 99%

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Minute-scale period oscillations of the magnetosphere

et al. 2011

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“…These are quasi-periodic perturbations in the few R E (Earth radius) wavelength range at the MP flank and BL when the IMF points strongly north. A meaningful example of this phenomenon, with a precise correlation of the frequencies of power spectrum peaks of GOES 8 (Geostationary Operational Environmental Satellites), and of ground magnetometers of the CANOPUS X meridional chain, with the characteristic frequency of the activity observed "in situ" by Cluster 3 is reported in [26,27]. The presence of such signatures constitutes a severe constraint on any interpretation that does not somehow involve the KH instability mechanism.…”

Section: The Aims Of This Workmentioning

confidence: 96%

“…How does the broadening of the flank BL produced by the KH instability depend on (i) the local orientation of B and V; (ii) the physical conditions at the boundary; and (iii) its distance from the subsolar point? Some of these questions have been addressed by members of our team, and by coworkers in recent studies [1,23,24,26,27,28,29,30].…”

Section: The Aims Of This Workmentioning

confidence: 99%

The Magnetosphere Mixing Layer: Observations, MHD Stability, and Large Eddy Simulations

Gratton

Bilbao

Gnavi

et al. 2011

J. Phys.: Conf. Ser.

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Abstract.The work is about the evolution of large vortices in the boundary layer of the terrestrial magnetopause studied by computational physics, in support of interpretive analysis of spacecraft data from an event observed on December 7, 2000. The distinctive features of the configuration examined are i) the very small magnetic shear across the boundary, and ii) the dynamics concerns mainly the vorticity. The magnetic field is only fluted during the process, but it determines the direction of the vortex axis. Considering new elements from computer simulations and observations, an extension of the research of a recent publication in this journal is reported. A magnetohydrodynamic code for large eddy simulations is used to examine the influence of supersonic, and superAlfvénic speeds, on the dynamics of the boundary layer. Correlations of data are studied to identify signatures of the Kelvin-Helmholtz instability, and the presence of whirling plasma. The aim is to improve the understanding of factors that govern the tailward growth of the low latitude boundary layer, and the potentiality of plasma entry into the magnetosphere, during periods of northward interplanetary magnetic field.

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Role of Low‐Frequency Boundary Waves in the Dynamics of the Dayside Magnetopause and the Inner Magnetosphere

Hwang

Sibeck

2016

Low‐Frequency Waves in Space Plasmas

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Aspects of magnetopause/magnetosphere response to interplanetary discontinuities, and features of magnetopause Kelvin–Helmholtz waves

Cited by 11 publications

References 48 publications

Minute-scale period oscillations of the magnetosphere

Minute-scale period oscillations of the magnetosphere

The Magnetosphere Mixing Layer: Observations, MHD Stability, and Large Eddy Simulations

Role of Low‐Frequency Boundary Waves in the Dynamics of the Dayside Magnetopause and the Inner Magnetosphere

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