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Simulation studies of a recorder in three dimensions 

Giordano, Nicholas J. (2015-10-12)
The aeroacoustics of a recorder are explored using a direct numerical simulation based on the Navier–Stokes equations in three dimensions. The qualitative behavior is studied using spatial maps of the air pressure and ...

Explaining the Railsback stretch in terms of the inharmonicity of piano tones and sensory dissonance 

Giordano, Nicholas J. (2015-10-26)
The perceptual results of Plomp and Levelt for the sensory dissonance of a pair of pure tones are used to estimate the dissonance of pairs of piano tones. By using the spectra of tones measured for a real piano, the effect ...

Free-Boundary Axisymmetric MHD Equilibrium 

Guazzotto, Luca (2018-07-09)
The calculation of equilibrium conditions is a common task in the study and modeling of magnetic-confinement experiments for con- trolled nuclear fusion, in which a high-temperature plasma is confined in a finite region ...

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

Wu, S; Denton, R; Liu, K; Hudson, M; 0000-0001-5882-1328 (2022-09-29)
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 ...

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

Weichao, Tu; Cowee, M; Liu, K; 0000-0003-3117-4030; 0000-0001-5882-1328; 0000-0003-4547-3269 (2022-09-30)
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 ...

Signatures of electron Landau resonant interactions with chorus waves from THEMIS observations 

Min, Kyungguk; Kaijun, Liu; Li, Wen; 0000-0001-5882-1328 (2022-10-04)
Simultaneous observations of electron phase space density (PSD) and chorus waves for more than 4 years by the Time History of Events and Macroscale Interactions during Substorms (THEMIS) are analyzed to identify signatures ...

A study of the electromagnetic proton cyclotron instability as a generation mechanism for EMIC waves in the Earth's magnetosphere using SCATHA data 

Nguyen, Son; Perez, J; Fennell, Joseph (2022-10-04)
Using 59 days of magnetic field data from SCATHA, a study of the electromagnetic proton cyclotron instability as a generation mechanism for EMIC waves in the Earth's magnetosphere has been conducted. From 1181 events found, ...

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 ...

SIMULATION STUDY OF THE RIEMANN PROBLEM ASSOCIATED WITH THE MAGNETOTAIL RECONNECTION 

Lin, Y; Lee, L; 0000-0003-4012-991X (2022-10-11)
The structure of reconnection layer in the distant magnetotail is studied by solving the Riemann problem for the evolution of an initial current sheet using one-dimensional MHD and hybrid simulations. Initially, the current ...

Investigation of the Interaction Between Magnetosheath Reconnection and Magnetopause Reconnection Driven by Oblique Interplanetary Tangential Discontinuity Using Three-Dimensional Global Hybrid Simulation 

Guo, Zhifang; Yu, Lin; Xueyi, Wang; 0000-0002-3728-6319 (2022-09-28)
Magnetosheath reconnection due to the interaction of an interplanetary directional discontinuity with the bow shock and Earth's magnetosphere under an initially northward interplanetary magnetic field (IMF) has been ...

Global-scale simulation of foreshock structures at the quasi-parallel bow shock 

Lin, Yu (2022-09-29)
A two-dimensional, global-scale hybrid simulation is carried out to study the kinetic structure of the quasi-parallel bow shock. In the simulation the bow shock forms by the interaction of the supersonic solar wind and the ...

The Silurian to Permian history of a metamorphic core complex in Lofoten, northern Scandinavian Caledonides 

Steltenpohl, Mark; Hames, Willis; Andresen, Arild (2022-09-29)
[1] The Lofoten archipelago exposes Precambrian Baltic basement and Caledonian allochthonous sequences within a 1000 km long chain of gravity and magnetic highs and structural culminations along the extended, British and ...

Kinetic Alfven Waves From Magnetotail to the Ionosphere in Global Hybrid Simulation Associated With Fast Flows 

Cheng, Lei; Lin, Yu; Perez, J; Johnson, Jay; Wang, Xueyi; 0000-0002-9562-1103; 0000-0002-5619-9093 (2022-09-29)
We have used the Auburn Global Hybrid Code in 3-D to study the generation, dynamics, and global structure of kinetic Alfven waves (KAWs) from the magnetotail to the ionosphere. Our results show that KAWs are generated in ...

Quantification of the Atmospheric Relativistic Electron Precipitation on 17 January 2013 

Shekhar, S; Millan, R; Woodger, L; Qin, M; 0000-0002-5770-6261; 0000-0002-2815-4998 (2022-09-29)
On 17 January 2013, relativistic electron precipitation (REP) was observed on Balloon Array for Radiation Belt Relativistic Electron Losses (BARREL) payloads, National Oceanic and Atmospheric Administration Polar orbiting ...

Reversal of magnetic field rotation in the reconnection layer due to shear flow effects 

Sun, Xiaoxia; Lin, Yu; Wang, Xiaogang (2022-09-29)
We investigate the effects of shear flows on the so-called component reconnection, in which the guide field B-y not equal 0, by solving a one-dimensional Riemann problem for magnetopause reconnection using a resistive MHD ...

A two-dimensional hybrid simulation of the magnetotail reconnection layer 

Lin, Y; Swift, D (2022-09-29)
Two-dimensional (2-D) hybrid simulations are carried out to study the structure of the reconnection layer in the distant magnetotail. In the simulation an initial current sheet separates the two lobes with antiparallel ...

Global Hybrid Simulations of Interaction Between Interplanetary Rotational Discontinuity and Bow Shock/Magnetosphere: Can Ion-Scale Magnetic Reconnection be Driven by Rotational Discontinuity Downstream of Quasi-Parallel Shock? 

Guo, Zhifang; Lin, Yu; Wang, X; 0000-0002-3728-6319 (2022-09-29)
Ion-scale magnetic reconnection has been observed downstream of the terrestrial quasi-parallel (Q-parallel to) shock. Whether it is driven by interplanetary discontinuities or turbulent Q-parallel to shock, however, is ...

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 ...

Generation of near-Earth reconnection by divergent flows in the plasma sheet 

Lin, Y; Swift, D (2022-10-04)
[1] A global two-dimensional hybrid simulation is carried out to study the evolution of the near-Earth plasma sheet. It is shown that reconnection X lines and plasmoids can be generated by diverging flows in the plasma ...

Understanding the growth rate patterns of ion Bernstein instabilities driven by ring-like proton velocity distributions 

Min, Kyungguk; Liu, Kaijun; 0000-0001-5882-1328; 0000-0001-5882-1328 (2022-09-20)
Fast magnetosonic waves in Earth's inner magnetosphere, which have as their source ion Bernstein instabilities, are driven by hot proton velocity distributions (f(p)) with partial derivative f(p)(v(perpendicular to))/partial ...