Browsing Physics by Author "Liu, Kaijun"

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Equatorial Evolution of the Fast Magnetosonic Mode in the Source Region: Observation-Simulation Comparison of the Preferential Propagation Direction

Min, Kyungguk; Boardsen, Scott A.; Denton, Richard E.; Liu, Kaijun; 0000-0001-5882-1328 (2020-05-28)

Recent analysis of an event observed by the Van Allen Probes in the source region outside the plasmapause has shown that fast magnetosonic waves (also referred to as equatorial noise) propagate preferentially in the azimuthal ...

Equatorial Evolution of the Fast Magnetosonic Mode in the Source Region: Observation-Simulation Comparison of the Preferential Propagation Direction

Min, Kyungguk; Boardsen, Scott; Denton, Richard; Liu, Kaijun; 0000-0001-5882-1328 (2023-01-25)

Fast magnetosonic waves driven by shell velocity distributions

Min, Kyungguk; Liu, Kaijun; 0000-0001-5882-1328 (2022-09-29)

Using linear dispersion theory and particle-in-cell simulations, we explore the ion Bernstein instability driven by the shell-type ion velocity distribution which is related to the excitation of fast magnetosonic waves in ...

Fast magnetosonic waves driven by shell velocity distributions

Min, Kyungguk; Liu, Kaijun; 0000-0001-5882-1328 (2022-09-29)

Fast magnetosonic waves driven by shell velocity distributions

Min, Kyungguk; Liu, Kaijun; 0000-0002-2095-8529; 0000-0001-5882-1328 (2020-06-05)

Fast Magnetosonic Waves Observed by Van Allen Probes: Testing Local Wave Excitation Mechanism

Min, Kyungguk; Liu, Kaijun; Wang, Xueyi; Chen, Lunjin; Denton, Richard E.; 0000-0001-5882-1328; 0000-0001-5533-5981 (2020-05-28)

Linear Vlasov theory and particle-in-cell (PIC) simulations for electromagnetic fluctuations in a homogeneous, magnetized, and collisionless plasma are used to investigate a fast magnetosonic wave event observed by the Van ...

Fast Magnetosonic Waves Observed by Van Allen Probes: Testing Local Wave Excitation Mechanism

Min, Kyungguk; Liu, Kaijun; Wang, Xueyi; Chen, Lunjin; Denton, Richard; 0000-0001-5882-1328; 0000-0001-5882-1328; 0000-0003-2489-3571 (2022-12-01)

Ion Bernstein instability as a possible source for oxygen ion cyclotron harmonic waves

Min, Kyungguk; Denton, Richard E.; Liu, Kaijun; Gary, S. Peter; Spence, Harlan E.; 0000-0001-5882-1328 (2020-06-01)

This paper demonstrates that an ion Bernstein instability can be a possible source for recently reported electromagnetic waves with frequencies at or near the singly ionized oxygen ion cyclotron frequency, Omega(+)(O), and ...

Ion Bernstein instability as a possible source for oxygen ion cyclotron harmonic waves

Min, Kyungguk; Denton, Richard; Liu, Kaijun; Gary, S. Peter; Spence, Harlan; 0000-0001-5882-1328; 0000-0001-5882-1328; 0000-0002-2526-2205; 0000-0002-4655-2316 (2023-01-18)

Ion Bernstein instability dependence on the proton-to-electron mass ratio: Linear dispersion theory

Min, Kyungguk; Liu, Kaijun; 0000-0001-5882-1328 (2022-10-04)

Fast magnetosonic waves, which have as their source ion Bernstein instabilities driven by tenuous ring-like proton velocity distributions, are frequently observed in the inner magnetosphere. One major difficulty in the ...

Ion Bernstein instability dependence on the proton-to-electron mass ratio: Linear dispersion theory

Min, Kyungguk; Liu, Kaijun; 0000-0002-2095-8529; 0000-0001-5882-1328 (2020-06-03)

Modeling the loss of inner belt protons by magnetic field line curvature scattering

Tu, Weichao; Cowee, M. M.; Liu, Kaijun; 0000-0001-5882-1328 (2020-06-05)

The sudden loss of energetic protons in the inner radiation belt has been observed during geomagnetic storms. It is hypothesized that this sudden loss occurs because of changes in the geomagnetic field configuration which ...

One- and two-dimensional hybrid simulations of whistler mode waves in a dipole field

Wu, S.; Denton, R. E.; Liu, Kaijun; Hudson, M. K.; 0000-0001-5882-1328 (2020-06-05)

We simulate whistler mode waves using a hybrid code. There are four species in the simulations, hot electrons initialized with a bi-Maxwellian distribution with temperature in the direction perpendicular to background ...

Particle-in-Cell Simulations of the Fast Magnetosonic Mode in a Dipole Magnetic Field: 1-D Along the Radial Direction

Min, Kyungguk; Liu, Kaijun; Denton, Richard E.; Boardsen, Scott A.; 0000-0001-5882-1328 (2020-05-28)

An electromagnetic particle-in-cell code is used to investigate self-consistent evolution of the fast magnetosonic mode in a one-dimensional configuration along the radial direction in a dipole background magnetic field. ...

Particle-in-Cell Simulations of the Fast Magnetosonic Mode in a Dipole Magnetic Field: 1-D Along the Radial Direction

Min, Kyungguk; Liu, Kaijun; Denton, Richard; Boardsen, Scott; 0000-0001-5882-1328 (2023-01-26)

Pickup proton instabilities and scattering in the distant solar wind and the outer heliosheath: Hybrid simulations

Liu, Kaijun; Mobius, Eberhard; Gary, S. Peter; Winske, Dan; 0000-0001-5882-1328 (2020-06-09)

The growth of magnetic field fluctuations driven by the injection of pickup ions perpendicular to a background magnetic field in a homogeneous, collisionless plasma is studied using one-dimensional hybrid simulations. ...

Pickup proton instabilities and scattering in the distant solar wind and the outer heliosheath: Hybrid simulations

Liu, Kaijun; Eberhard, Möbius; Gary, S. Peter; Winske, Dan; 0000-0001-5882-1328; 0000-0002-2745-6978 (2022-10-27)

Proton velocity ring-driven instabilities and their dependence on the ring speed: Linear theory

Min, Kyungguk; Liu, Kaijun; Gary, Peter; 0000-0002-4655-2316; 0000-0001-5882-1328 (2022-10-12)

Linear dispersion theory is used to study the Alfven-cyclotron, mirror and ion Bernstein instabilities driven by a tenuous (1%) warm proton ring velocity distribution with a ring speed, v(r), varying between 2v(A) and ...

Proton velocity ring-driven instabilities and their dependence on the ring speed: Linear theory

Min, Kyungguk; Liu, Kaijun; Gary, S. Peter; 0000-0001-5882-1328 (2020-05-28)

Proton velocity ring-driven instabilities in the inner magnetosphere: Linear theory and particle-in-cell simulations

Min, Kyungguk; Liu, Kaijun; 0000-0001-5882-1328 (2022-09-29)

Linear dispersion theory and electromagnetic particle-in-cell (PIC) simulations are used to investigate linear growth and nonlinear saturation of the proton velocity ring-driven instabilities, namely, ion Bernstein instability ...