Chris Crabtree
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View article: Direct observation of strong wave/particle interactions in electron-beam-driven plasma wave bursts
Direct observation of strong wave/particle interactions in electron-beam-driven plasma wave bursts Open
We present detailed observations of bursting wave behavior at f≃fpe/2 driven by an electron beam in a laboratory plasma, including high-time-resolution measurements of the wave bursts' interaction with the electron beam. A burst of wave ac…
View article: Nonlinear evolution, propagation, electron-trapping, and damping effects of ion-acoustic solitons using fully kinetic PIC simulations
Nonlinear evolution, propagation, electron-trapping, and damping effects of ion-acoustic solitons using fully kinetic PIC simulations Open
We investigate ion acoustic solitary waves (solitons) of varying amplitudes in a one-dimensional plasma using fully kinetic particle-in-cell simulations. The initial soliton conditions are based on the Korteweg–de Vries (KdV) equation, tre…
View article: 2D kinetic simulations of whistler wave generation by nonlinear scattering of lower-hybrid waves in turbulent plasmas
2D kinetic simulations of whistler wave generation by nonlinear scattering of lower-hybrid waves in turbulent plasmas Open
Turbulent plasmas in space, laboratory experiments, and astrophysical domains can often be described by weak turbulence theory, which can be characterized as a broad spectrum of incoherent interacting waves. We investigate a fundamental no…
View article: Synchronization of dust acoustic waves in a forced Korteweg–de Vries–Burgers model
Synchronization of dust acoustic waves in a forced Korteweg–de Vries–Burgers model Open
The synchronization of dust acoustic waves to an external periodic source is studied in the framework of a driven Korteweg-de Vries-Burgers equation that takes into account the appropriate nonlinear and dispersive nature of low-frequency w…
View article: Dust Ejecta in Impact Plasmas
Dust Ejecta in Impact Plasmas Open
View article: Whistler Waves from an Artificial Ion Ring in the Ionosphere: Nonlinear Scattering, Energy Conversion Efficiency, and Propagation into the Magnetosphere
Whistler Waves from an Artificial Ion Ring in the Ionosphere: Nonlinear Scattering, Energy Conversion Efficiency, and Propagation into the Magnetosphere Open
View article: Electromagnetic pinned solitons for space debris detection
Electromagnetic pinned solitons for space debris detection Open
Electromagnetic “pinned” solitons in the form of stationary nonlinear waves are studied within the framework of an inertial magneto-hydrodynamic model. These structures, that can arise when a charged source moves in a magnetized plasma, ha…
View article: Synchronization of Dust Acoustic Waves in a forced Korteweg-de Vries-Burgers model
Synchronization of Dust Acoustic Waves in a forced Korteweg-de Vries-Burgers model Open
The synchronization of dust acoustic waves to an external periodic source is studied in the framework of a driven Korteweg-de Vries-Burgers equation that takes into account the appropriate nonlinear and dispersive nature of low frequency w…
View article: MMS Observations of a Compressed Current Sheet: Importance of the Ambipolar Electric Field
MMS Observations of a Compressed Current Sheet: Importance of the Ambipolar Electric Field Open
Spacecraft data reveals a nonuniform ambipolar electric field transverse to the magnetic field in a thin magnetotail current sheet that leads to intense ExB velocity shear and non-gyrotropic particle distributions. The ExB drift far exceed…
View article: Cross-scale energy cascade powered by magnetospheric convection
Cross-scale energy cascade powered by magnetospheric convection Open
Plasma convection in the Earth’s magnetosphere from the distant magnetotail to the inner magnetosphere occurs largely in the form of mesoscale flows, i.e., discrete enhancements in the plasma flow with sharp dipolarizations of magnetic fie…
View article: Van Allen Probes Observations of Symmetric Stormtime Compressional ULF Waves
Van Allen Probes Observations of Symmetric Stormtime Compressional ULF Waves Open
Previous spacecraft studies showed that stormtime poloidal ultralow‐frequency (ULF) waves in the ring current region have an antisymmetric (second harmonic) mode structure about the magnetic equator. This paper reports Van Allen Probes obs…
View article: MMS Observations of a Compressed Current Sheet: Importance of the\n Ambipolar Electric Field
MMS Observations of a Compressed Current Sheet: Importance of the\n Ambipolar Electric Field Open
Spacecraft data reveals a nonuniform ambipolar electric field transverse to\nthe magnetic field in a thin magnetotail current sheet that leads to intense\nExB velocity shear and non-gyrotropic particle distributions. The ExB drift far\nexc…
View article: Magnetospheric Convection: From Mesoscale Flows To Microscale Instabilities
Magnetospheric Convection: From Mesoscale Flows To Microscale Instabilities Open
Plasma convection in the Earth’s magnetosphere from the distant magnetotail to the inner magnetosphere occurs largely in the form of mesoscale flows, i.e., discrete enhancements in the plasma flow with sharp dipolarizations of magnetic fie…
View article: Development of an Injection-Seeded Tunable OPO for Doppler Global Velocimetry.
Development of an Injection-Seeded Tunable OPO for Doppler Global Velocimetry. Open
View article: On the rate of energy deposition by an ion ring velocity beam
On the rate of energy deposition by an ion ring velocity beam Open
Using a novel three-dimensional electromagnetic hybrid code, XHYPERS, we simulate the generation of lower hybrid oscillations in a magnetized plasma by a heavy ion beam with a ring-shaped velocity distribution over much longer periods of t…
View article: Lower-hybrid wave instability due to multiple fast heavy ion ring distributions in the SMART experiment
Lower-hybrid wave instability due to multiple fast heavy ion ring distributions in the SMART experiment Open
Development and stability of heavy ion ring beams created by high speed neutral atom injection in the Earth's ionosphere is analyzed in view of the upcoming space measurement of a rocket-released turbulence (SMART) mission. It is found tha…
View article: Behavior of compressed plasmas in magnetic fields
Behavior of compressed plasmas in magnetic fields Open
View article: A forced Korteweg–de Vries model for nonlinear mixing of oscillations in a dusty plasma
A forced Korteweg–de Vries model for nonlinear mixing of oscillations in a dusty plasma Open
Nonlinear mixing of oscillations in a dusty plasma due to the harmonic time varying modulation of a nonlinear compressional oscillation is analyzed using a simple mathematical model consisting of a forced Korteweg–de Vries equation. An exa…
View article: Maestro: a new python framework for orchestrating ray tracing simulations of radio frequency plasma waves in the magnetosphere
Maestro: a new python framework for orchestrating ray tracing simulations of radio frequency plasma waves in the magnetosphere Open
We are studying the generation and propagation of whistler-mode waves from the upper ionosphere into the magnetosphere. We are using a ray-tracing approach to solve the wave propagation problem, which enables low computational-cost, rapid …
View article: Early Time Evolution of Turbulence in the Space Environment by Neutral Beam Injection
Early Time Evolution of Turbulence in the Space Environment by Neutral Beam Injection Open
The Space Measurement of A Rocket‐released Turbulence mission will demonstrate the production and evolution of turbulence in the space environment via a cascade of plasma physics processes. A sounding rocket will inject neutral barium atom…
View article: Particle Dynamics in the Earth's Radiation Belts: Review of Current Research and Open Questions
Particle Dynamics in the Earth's Radiation Belts: Review of Current Research and Open Questions Open
The past decade transformed our observational understanding of energetic particle processes in near‐Earth space. An unprecedented suite of observational systems was in operation including the Van Allen Probes, Arase, Magnetospheric Multisc…
View article: Understanding and Harnessing the Dual Electrostatic/Electromagnetic Character of Plasma Turbulence in the Near‐Earth Space Environment
Understanding and Harnessing the Dual Electrostatic/Electromagnetic Character of Plasma Turbulence in the Near‐Earth Space Environment Open
The ability to morph electrostatic plasma turbulence into electromagnetic has promising applications, including the possibility of actively influencing the near‐Earth plasma state, aka the space weather. This dual (electrostatic/electromag…
View article: A New Perspective for Dipolarization Front Dynamics: Electromagnetic Effects of Velocity Inhomogeneity
A New Perspective for Dipolarization Front Dynamics: Electromagnetic Effects of Velocity Inhomogeneity Open
The stability of a quasi‐static near‐Earth dipolarization front (DF) is investigated with a two‐dimensional electromagnetic particle‐in‐cell model. Strongly localized ambipolar electric fields self‐consistently generate a highly sheared da…
View article: Kinetic Equilibrium and Stability Analysis of Dipolarization Fronts
Kinetic Equilibrium and Stability Analysis of Dipolarization Fronts Open
Dipolarization fronts are typically observed with a density gradient of scale size comparable to an ion gyroradius, which naturally results in an ambipolar electric field in the direction of the gradient. Prevailing models ignore this ambi…
View article: Kinetic Equilibrium of Dipolarization Fronts
Kinetic Equilibrium of Dipolarization Fronts Open
View article: Experimental observation of cnoidal waveform of nonlinear dust acoustic waves
Experimental observation of cnoidal waveform of nonlinear dust acoustic waves Open
The experimentally measured waveform of nonlinear dust acoustic waves in a plasma is shown to be accurately described by a cnoidal function. This function, which is predicted by nonlinear theory, has broad minima and narrow peaks. Fitting …
View article: Nonlinear Generation of Electromagnetic Waves through Induced Scattering by Thermal Plasma
Nonlinear Generation of Electromagnetic Waves through Induced Scattering by Thermal Plasma Open