Chen, Lunjin
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Lunjin Chen is an Assistant Professor of Physics. His interest is in the interaction between electromagnetic waves and charged particles in the Earth's magnetosphere. Dr. Chen's research areas include:
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Recent Submissions
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Observational Evidence of the Drift-Mirror Plasma Instability in Earth's Inner Magnetosphere
We report on evidence for the generation of an ultra-low frequency plasma wave by the drift-mirror plasma instability in the dynamic plasma environment of Earth's inner magnetosphere. The plasma measurements are obtained ... -
Instability in a Relativistic Magnetized Plasma
We present a general relativistic linear growth rate formula of electromagnetic waves for any wave normal angle and a general distribution function in a uniform magnetized plasma with a dominant cold plasma component and ... -
Two-Dimensional Particle-In-Cell Simulation of Magnetosonic Wave Excitation in a Dipole Magnetic Field
The excitation of magnetosonic waves in the meridian plane of a rescaled dipole magnetic field is investigated, for the first time, using a general curvilinear particle-in-cell simulation. Our simulation demonstrates that ... -
Statistical Properties of Plasmaspheric Hiss from Van Allen Probes Observations
Van Allen Probes observations are used to statistically investigate plasmaspheric hiss wave properties. This analysis shows that the wave normal direction of plasmaspheric hiss is predominantly field aligned at larger L ... -
Generation of Lower Harmonic Magnetosonic Waves through Nonlinear Wave-Wave Interactions
Although magnetosonic waves in the Earth's magnetosphere have been well understood by the linear theory, low harmonic magnetosonic waves, which often lack of free energy, can be unusually present. By employing a 1-D ... -
Eigenmode Analysis of Compressional Poloidal Modes in a Self-Consistent Magnetic Field
In this study, we simulate a self-consistent magnetic field that satisfies force balance with a model ring current that is radially localized, axisymmetric, and has anisotropic plasma pressure. We find that the magnetic ... -
One-Dimensional Full Wave Simulation of Equatorial Magnetosonic Wave Propagation in an Inhomogeneous Magnetosphere
The effect of the plasmapause on equatorially radially propagating fast magnetosonic (MS) waves in the Earth's dipole magnetic field is studied by using finite difference time domain method. We run 1-D simulation for three ... -
Fast Magnetosonic Waves Observed by Van Allen Probes: Testing Local Wave Excitation Mechanism
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 ... -
On the Diffusion Rates of Electron Bounce Resonant Scattering by Magnetosonic Waves
Magnetosonic waves have been demonstrated as effective for bounce resonant scattering. Electron scattering rates due to bounce resonance interaction with magnetosonic waves are derived in a general form, where the effects ... -
Coherently Modulated Whistler Mode Waves Simultaneously Observed over Unexpectedly Large Spatial Scales
Utilizing simultaneous twin Van Allen Probes observations of whistler mode waves at variable separations, we are able to distinguish the temporal variations from spatial variations, determine the coherence spatial scale, ... -
The Characteristic Response of Whistler Mode Waves to Interplanetary Shocks
(Amer Geophysical Union, 2018-11-05)Magnetospheric whistler mode waves play a key role in regulating the dynamics of the electron radiation belts. Recent satellite observations indicate a significant influence of interplanetary (IP) shocks on whistler mode ... -
On the Origin of Ionospheric Hiss: A Conjugate Observation
(Amer Geophysical Union, 2018-11-05)We present a conjugate observation on whistler mode electromagnetic hiss from the low Earth orbit satellite Detection of Electro-Magnetic Emissions Transmitted from Earthquake Regions (DEMETER) and the high-altitude ... -
The Radiation Belt Electron Scattering by Magnetosonic Wave: Dependence on Key Parameters
(Amer Geophysical Union, 2018-10-22)Magnetosonic (MS) waves have been found capable of creating radiation belt electron butterfly distributions in the inner magnetosphere. To investigate the physical nature of the interactions between radiation belt electrons ... -
Propagation Characteristics of Plasmaspheric Hiss: Van Allen Probe Observations and Global Empirical Models
(Amer Geophysical Union, 2017-03-13)Based on the Van Allen Probe A observations from 1 October 2012 to 31 December 2014, we develop two empirical models to respectively describe the hiss wave normal angle (WNA) and amplitude variations in the Earth's ... -
Relativistic Electron's Butterfly Pitch Angle Distribution Modulated by Localized Background Magnetic Field Perturbation Driven by Hot Ring Current Ions
(Amer Geophysical Union, 2017-05-21)Dayside modulated relativistic electron's butterfly pitch angle distributions (PADs) from ~ 200 keV to 2.6 MeV were observed by Van Allen Probe B at L = 5.3 on 15 November 2013. They were associated with localized magnetic ... -
Spectral Properties and Associated Plasma Energization by Magnetosonic Waves in the Earth's Magnetosphere: Particle-In-Cell Simulations
(Amer Geophysical Union, 2017-05-24)In this paper, we perform a 1-D particle-in-cell (PIC) simulation model consisting of three species, cold electrons, cold ions, and energetic ion ring, to investigate spectral structures of magnetosonic waves excited by ... -
Observations of Discrete Harmonics Emerging from Equatorial Noise
(Nature Publishing Group, 2015-07-14)A number of modes of oscillations of particles and fields can exist in space plasmas. Since the early 1970s, space missions have observed noise-like plasma waves near the geomagnetic equator known as 'equatorial noise'. ... -
A Parametric Study for the Generation of Ion Bernstein Modes from a Discrete Spectrum to a Continuous One in the Inner Magnetosphere. II. Particle-In-Cell Simulations
(American Institute of Physics Inc, 2016-02-10)In this paper, we perform one-dimensional particle-in-cell simulations to investigate the properties of perpendicular magnetosonic waves in a plasma system consisting of three components: cool electrons, cool protons, and ... -
Generation of Magnetosonic Waves Over a Continuous Spectrum
(Blackwell Publishing Ltd, 2016-01-08)Magnetosonic waves, also known as equatorial noise emission, were found to have discrete frequency structures, which is consistent with instability caused by proton ring distribution. Nonetheless, nondiscrete structure, ...
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