Eigenmode analysis of compressional waves in the magnetosphere

Cheng, C. Z.; Lin, C. S.

doi:10.1029/gl014i008p00884

Cited by 62 publications

(76 citation statements)

References 12 publications

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“…Note that in the work by Cheng and Lin [1987a], Re[m] < 0 was assumed, and accordingly the sign of the azimuthal component shown above is opposite to that given in their Figure 2. which has an antisymmetric structure [Takahashi et al, 1987a]. Note that in the work by Cheng and Lin [1987a], Re[m] < 0 was assumed, and accordingly the sign of the azimuthal component shown above is opposite to that given in their Figure 2. which has an antisymmetric structure [Takahashi et al, 1987a].…”

Section: T •Otmentioning

confidence: 91%

“…The polarization is a consequence of westward propagation with oo/kll < VA [Takahashi et al, 1987a;Cheng and Lin, 1987a]. We assume that the wave propagation in the plasma rest frame is strictly westward, i.e., k•_ = -k_c•y with k•_ > 0, and that the wave phase velocity gph --l oo/kml is of the order of 10 km/s.…”

Section: In This Section We Describe a Phenomenological Model For Thementioning

confidence: 99%

“…For example, the drift mirror instability generates a westward propagating wave ff the plasma pressure has an inward gradient [Cheng and Lin, 1987a]. For example, the drift mirror instability generates a westward propagating wave ff the plasma pressure has an inward gradient [Cheng and Lin, 1987a].…”

Section: Drift Mirror Instability In a Realistic Field Geometrymentioning

confidence: 99%

“…Pressure They found that the unstable drift mirror wave has an antisymmetric standing wave structure of 8B II along the ambient magnetic field, as illustrated in Figure 12. In the work by Cheng and Lin [1987a] the westward propagating wave was generated at the outer edge of the ring current. In the work by Cheng and Lin [1987a] the westward propagating wave was generated at the outer edge of the ring current.…”

Section: Drift Mirror Instability In a Realistic Field Geometrymentioning

confidence: 99%

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Observation and theory of Pc 5 waves with harmonically related transverse and compressional components

et al. 1990

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The properties of 23 magnetic pulsation events observed by the AMPTE CCE spacecraft are studied. These events are selected on the basis of the field magnitude which oscillated at the second harmonic of a simultaneously present transverse oscillation. The events have a second harmonic period of 80–600 s (roughly the Pc 5 range), are observed in cluster in the dawn (0300–0800 magnetic local time, MLT) and dusk (1600–2100 MLT) sectors, and are localized near the magnetic equator. Although the azimuthal wave number, m, estimated from an ion finite Larmor radius effect, is generally large (|m| ∼ 50), there is a marked difference between the events observed in the dawn and dusk sectors. In the dawn sector the waves have low frequencies (1–5 mHz), indicate left‐hand polarization with respect to the ambient magnetic field, and propagate eastward with respect to the spacecraft. In the dusk sector the waves have high frequencies (5–15 mHz), indicate right‐hand polarization, and propagate westward. We suggest that the waves are all westward propagating in the plasma rest frame and that local‐time‐dependent Doppler shift is the reason for the local time dependence of the wave properties. The drift mirror instability is considered to be the mechanism for exciting the westward propagating waves. An analytical formula for the ion flux oscillations is derived on the basis of the nonlinear gyrokinetic theory. The observed correlation between the ion flux and the parallel magnetic field perturbation δB∥ can be adequately explained with this analytical formula.

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Section: T •Otmentioning

confidence: 91%

Section: In This Section We Describe a Phenomenological Model For Thementioning

confidence: 99%

Section: Drift Mirror Instability In a Realistic Field Geometrymentioning

confidence: 99%

Section: Drift Mirror Instability In a Realistic Field Geometrymentioning

confidence: 99%

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Observation and theory of Pc 5 waves with harmonically related transverse and compressional components

et al. 1990

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“…For example, the pioneering works of Cheng and Lin (1987); Cheng and Qian (1994) on the effect of parallel inhomogeneity need to be further developed. Even if near the equator the mirror instability condition is satisfied, τ < 0, it becomes close to τ 1 near the ionosphere because the β parameter quickly grows towards the ionosphere due to field line convergence.…”

Section: Drift Mirror Modesmentioning

confidence: 99%

Magnetohydrodynamic Oscillations in the Solar Corona and Earth’s Magnetosphere: Towards Consolidated Understanding

Nakariakov

Пилипенко

Heilig³

et al. 2016

Space Sci Rev

181

128

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Magnetohydrodynamic (MHD) oscillatory processes in different plasma systems, such as the corona of the Sun and the Earth's magnetosphere show interesting similarities and differences, which so far received little attention and remain underexploited. The successful commissioning within the past ten years of SDO, Hinode, STEREO and THEMIS spacecraft, in combination with matured analysis of data from earlier spacecraft (Wind, SOHO, ACE, Cluster, TRACE and RHESSI) makes it very timely to survey the breadth of observations giving evidence for MHD oscillatory processes in solar and space plasmas, and state-of-the-art theoretical modelling. The paper reviews several important topics, such as Alfvénic resonances and mode conversion; MHD waveguides, such as the magnetotail, coronal loops, coronal streamers; mechanisms for periodicities produced in energy releases during substorms and solar flares, possibility of Alfvénic resonators along open field lines; possible drivers of MHD waves; diagnostics of plasmas with MHD waves; interaction of MHD waves with partly-ionised boundaries (ionosphere and chromosphere). The review is mainly oriented to specialists in magnetospheric physics and solar physics, but not familiar with specifics of the adjacent research fields.

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THEMIS observations of compressional poloidal pulsations in the dawnside magnetosphere: A case study

et al. 2013

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[1] We present results from a case study of compressional poloidal pulsations with periods ranging from 5 to 12 min in the dawn magnetosphere from 1630 to 2000 UT on 27 February 2011. However, we employ THEMIS (Time History of Events and Macroscale Interactions during Substorms) magnetic field, plasma, and energetic particle observations to determine azimuthal wavelengths (7000-27,000 km) and velocities (9-28 km/s) consistent with previous work. We then apply a new method invoking the north to south motion of the THEMIS spacecraft and the fact that the equatorial node exhibited north-south oscillations to derive the meridional structure of the wave in great detail. We determined that the amplitude of the meridional motion of the equatorial node was~0.8 R E , and that the meridional wave length exceeded 3 R E .

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Eigenmode analysis of compressional waves in the magnetosphere

Cited by 62 publications

References 12 publications

Observation and theory of Pc 5 waves with harmonically related transverse and compressional components

Observation and theory of Pc 5 waves with harmonically related transverse and compressional components

Magnetohydrodynamic Oscillations in the Solar Corona and Earth’s Magnetosphere: Towards Consolidated Understanding

THEMIS observations of compressional poloidal pulsations in the dawnside magnetosphere: A case study

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