Browsing Physics by Author "Min, Kyungguk"

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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)

Externally driven plasmaspheric ULF waves observed by the Van Allen Probes

Takashashi, Kazue; Min, Kyungguk; MacDowall, Robert; 0000-0002-2095-8529 (2020-06-05)

We analyze data acquired by the Van Allen Probes on 8 November 2012, during a period of extended low geomagnetic activity, to gain new insight into plasmaspheric ultralow frequency (ULF) waves. The waves exhibited strong ...

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)

Field line distribution of mass density at geostationary orbit

Denton, R. E.; Takahashi, Kazue; Lee, Jimyoung; Zeitler, C. K.; Wimer, N. T.; Litscher, L. E.; Singer, H. J.; Min, Kyungguk; 0000-0002-2095-8529 (2020-06-05)

The distribution of mass density along the field lines affects the ratios of toroidal (azimuthally oscillating) Alfven frequencies, and given the ratios of these frequencies, we can get information about that distribution. ...

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)

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)

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 ...

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

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

Quiet time equatorial mass density distribution derived from AMPTE/CCE and GOES using the magnetoseismology technique

Min, Kyungguk; Bortnik, Jacob; Denton, Richard E.; Takahashi, Kazue; Lee, Jeongwoo; Singer, Howard J.; 0000-0002-2095-8529 (2020-06-05)

An inversion technique for estimating the properties of the magnetospheric plasma from the harmonic frequencies of the toroidal standing Alfven waves has been used to derive the global equatorial mass density covering ...