Hybrid simulation of mode conversion at the magnetopause

Lin, Y.; Wang, X. Y.

doi:10.1029/2009ja014524

Cited by 37 publications

(61 citation statements)

References 81 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The ratio |δE |/|δE x | in the resulting KAW is found to be linearly proportional to T e0 /T i0 [48], consistent with the linear two-fluid theory with gyrokinetic closure for the ion pressure [44,51,52].…”

Section: -D Simulation Resultsmentioning

confidence: 49%

“…The strongest wave excitation is clearly coincident with the predicted Alfvén resonance position X r , and upstream radiation of the waves is seen to some spatial extent. On the magnetospheric (right) side of X r , the structure shows a pure spatial decay [48].…”

Section: -D Simulation Resultsmentioning

confidence: 99%

“…For the cases shown in this paper, the magnetic fields in the magnetosheath and magnetosphere point along z and are parallel to each other. Effects of the background magnetic field oblique to z can be seen in Lin et al [48].…”

Section: Hybrid Simulation Modelmentioning

confidence: 97%

“…The 2-D simulation [48] is performed in the xz plane, with x being the direction normal to the magnetopause and z the direction of wave vector tangential to the magnetopause. Initially, the magnetopause current sheet in slab geometry is assumed to be centered at x = 0 in the middle of the simulation domain, separating two uniform plasma regions of the magnetosheath (x < 0) with a high density and low magnetic field strength and magnetosphere (x > 0) with a low density and high magnetic field.…”

Section: Hybrid Simulation Modelmentioning

confidence: 99%

“…In this paper, our recent two-dimensional (2-D) [48] and 3-D hybrid simulations are shown for evolution of an incident compressional fast mode wave at the dayside magnetopause. The hybrid model solves fully kinetic equations governing the ions and a fluid model for electrons including electron pressure effects.…”

mentioning

confidence: 99%

See 4 more Smart Citations

Simulation of mode conversion at the magnetopause

Lin

Wang

2012

Chin. Sci. Bull.

View full text Add to dashboard Cite

Two-dimensional (2-D) and three-dimensional (3-D) hybrid simulations are carried out for mode conversion from fast mode compressional wave to kinetic Alfvén waves (KAWs) at the inhomogeneous magnetopause boundary. For cases in which the incident fast wave propagates in the xz plane, with the magnetopause normal along x and the background magnetic field pointing along z, the 2-D (xz) simulation shows that KAWs with large wave number k x ρ i ∼ 1 are generated near the Alfvén resonance surface, where ρ i is the ion Larmor radius. Several nonlinear wave properties are manifest in the mode conversion process. Harmonics of the driver frequency are generated. As a result of nonlinear wave interaction, the mode conversion region and its spectral width are broadened. In the 3-D simulation, after this first stage of the mode conversion to KAWs with large k x , a subsequent generation of KAW modes of finite k y is observed in the later stage, through a nonlinear parametric decay process. Since the nonlinear cascade to k y can lead to massive transport at the magnetopause, the simulation results provide an effective transport mechanism at the plasma boundaries in space as well as laboratory plasmas.

show abstract

Section: -D Simulation Resultsmentioning

confidence: 49%

Section: -D Simulation Resultsmentioning

confidence: 99%

Section: Hybrid Simulation Modelmentioning

confidence: 97%

Section: Hybrid Simulation Modelmentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

Simulation of mode conversion at the magnetopause

Lin

Wang

2012

Chin. Sci. Bull.

View full text Add to dashboard Cite

show abstract

Magnetospheric boundary perturbations on MHD and kinetic scales

Chen

Fok

2015

JGR Space Physics

View full text Add to dashboard Cite

To study the magnetopause on both MHD and kinetic scales, we have analyzed two Time History of Events and Macroscale Interactions during Substorms/Acceleration, Reconnection, Turbulence, and Electrodynamics of the Moon' s Interaction with the Sun magnetopause crossings under steady slow-solar wind and minimum magnetic shear conditions. These events approximate a ground state of the magnetospheric boundary with minimum influences from large-solar wind disturbances and magnetic reconnection. Our observations reveal evidence for the Kelvin-Helmholtz instability, the quasi-periodicity of magnetopause surface waves accompanied by highly asymmetrical plasma signatures between the inbound (from magnetosheath to low-latitude boundary layer (LLBL)) and the outbound (from LLBL to magnetosheath) magnetopause crossings. Stronger plasma and magnetic gradients were observed during the outbound crossings but more gradual and volatile variations at higher frequencies during the inbounds. The scale lengths of the magnetic and plasma gradients were comparable or less than the proton gyroradius. Enhancements of lower hybrid waves occurred at the locations of strong gradients or variations. We interpreted the collocations of the lower hybrid waves and plasma gradients and their variations in terms of (1) lower hybrid instabilities that directly convert solar wind flow energy into lower hybrid waves and other wave modes in the LLBL, or (2) Kelvin-Helmholtz instability and magnetic reconnection which produce the conditions for the lower hybrid instabilities to grow. The rate of ion diffusion across the magnetopause caused by the lower hybrid instability is marginally sufficient to populate the LLBL. The diffusion coefficient of O + is~30 times larger than that of H + . The lower hybrid waves could contribute to the energy dissipation at plasma gradients in magnetopause surface wave structures and limit Kelvin-Helmholtz instability growth further downstream.

show abstract

Global modeling of ULF waves at Mercury

Kim

Valeo

Phillips

2015

Geophysical Research Letters

View full text Add to dashboard Cite

ULF waves in the ion cyclotron frequency range waves are regularly observed at Mercury's magnetosphere. Although previous statistical studies have shown that ULF waves are primarily compressional near the equator and transverse with linear polarization at higher latitude, the underlying reason for this distribution of wave polarization has not been understood. In order to address this key question, we have developed a two‐dimensional, finite element code that solves the full wave equations in global magnetospheric geometry. Using this code, we show that (1) efficient mode conversion from the fast compressional waves to the ion‐ion hybrid resonance occurs at Mercury consistent with previous calculations; (2) such mode‐converted waves globally oscillate similar to field line resonance at Earth; and (3) compressional wave energy is primarily localized near the equator, while field‐aligned transverse, linearly polarized waves generated by mode conversion at the ion‐ion hybrid resonance radiate to higher latitude. Based on these wave solutions, we suggest that the strong transverse component of observed ULF waves at Mercury in high magnetic latitude can be explained as excitation of the field line resonant waves at the ion‐ion hybrid resonance.

show abstract

Hybrid simulation of mode conversion at the magnetopause

Cited by 37 publications

References 81 publications

Simulation of mode conversion at the magnetopause

Simulation of mode conversion at the magnetopause

Magnetospheric boundary perturbations on MHD and kinetic scales

Global modeling of ULF waves at Mercury

Contact Info

Product

Resources

About