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Scalings for the Alfven-cyclotron instability: Linear dispersion theory and hybrid particle-in-cell simulations 

Gary, S. Peter; Fu, Xiangrong; Cowee, Misa M.; Winske, Dan; Liu, Kaijun; 0000-0001-5882-1328 (2020-06-01)
The Alfven-cyclotron instability is driven by an ion temperature anisotropy such that T-perpendicular to/T-|| >1 where and || denote directions perpendicular and parallel to a uniform background magnetic field B-o, ...

Scalings for the Alfven-cyclotron instability: Linear dispersion theory and hybrid particle-in-cell simulations 

Gary, S. Peter; Fu, Xiangrong; Cowee, Misa M.; Winske, Dan; Liu, Kaijun; 0000-0003-3117-4030; 0000-0001-5882-1328; 0000-0002-4305-6624; 0000-0002-4655-2316 (2022-10-27)
The Alfven-cyclotron instability is driven by an ion temperature anisotropy such that T-perpendicular to/T-|| >1 where and || denote directions perpendicular and parallel to a uniform background magnetic field B-o, ...

Scalings of Alfven-cyclotron and ion Bernstein instabilities on temperature anisotropy of a ring-like velocity distribution in the inner magnetosphere 

Gary, Peter; Min, Kyungguk; Liu, Kaijun; 0000-0001-5882-1328 (2022-09-29)
A ring-like proton velocity distribution with f(p)(v)/v>0 and which is sufficiently anisotropic can excite two distinct types of growing modes in the inner magnetosphere: ion Bernstein instabilities with multiple ion ...

Scalings of Alfven-cyclotron and ion Bernstein instabilities on temperature anisotropy of a ring-like velocity distribution in the inner magnetosphere 

Min, Kyungguk; Liu, Kaijun; Gary, S. Peter; 0000-0002-2095-8529; 0000-0001-5882-1328 (2020-06-03)
A ring-like proton velocity distribution with f(p)(v)/v>0 and which is sufficiently anisotropic can excite two distinct types of growing modes in the inner magnetosphere: ion Bernstein instabilities with multiple ion ...

Semiautomated Identification and Characterization of Dunes at Hargraves Crater, Mars 

Emran, A; Marzen, L; King, D; 0000-0002-4420-0595 (2022-09-29)
The Mars Global Digital Dune Database (MGD(3)) contains information on Martian dune fields and prepared manually from the Thermal Emission Imaging System (THEMIS; 100 m/pixel) images. Although the MGD(3)outlines dune fields, ...

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 ...

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

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

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 ...

Simulation of pressure pulses in the bow shock and magnetosheath driven by variations in interplanetary magnetic field direction 

Lin, Y; Swift, DW; Lee, LC; 0000-0003-4012-991X (2022-10-25)
Two-dimensional (2-D) hybrid simulations are carried out to study the effects of the variation in the interplanetary magnetic field (IMF) direction on the bow shock, magnetosheath, and magnetosphere. A curvilinear coordinate ...

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 ...

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 ...

Solar cycle variation of plasma mass density in the outer magnetosphere: Magnetoseismic analysis of toroidal standing Alfven waves detected by Geotail 

Takahashi, Kazue; Denton, Richard E.; Hirahara, Masafumi; Min, Kyungguk; Ohtani, Shin-ichi; Sanchez, Ennio; 0000-0002-2095-8529 (2020-06-05)
We study the variation of plasma mass density in the outer magnetosphere over a solar cycle using mass density estimated from the frequency of fundamental toroidal standing Alfven waves observed by the Geotail spacecraft. ...

Solitary potential structures associated with ion and electron beams near 1 R-E altitude 

Bounds, SR; Pfaff, Rf; Knowlton, SF; Mozer, FS; Temerin, MA; Kletzing, CA (2020-06-30)
Small-scale solitary electric potential structures are commonly observed on auroral field lines with the Polar Electric Field Instrument (EFI). This study focuses on observations of solitary structures in the southern ...

Solitary potential structures associated with ion and electron beams near 1 R-E altitude 

Bounds, Scott; Pfaff, Robert; Knowlton, Stephen; Mozer, Forrest; Temerin, Michael; Kletzing, Craig; 0000-0002-4881-9715 (2022-10-27)
Small-scale solitary electric potential structures are commonly observed on auroral field lines with the Polar Electric Field Instrument (EFI). This study focuses on observations of solitary structures in the southern ...

Spectral properties and associated plasma energization by magnetosonic waves in the Earth's magnetosphere: Particle-in-cell simulations 

Sun, Jicheng; Gao, Xinliang; Lu, Quanming; Chen, Lunjin; Liu, Xu; Wang, Xueyi; Tao, Xin; Wang, Shui; 0000-0001-5533-5981 (2020-06-01)
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 ...

Spectral properties and associated plasma energization by magnetosonic waves in the Earth's magnetosphere: Particle-in-cell simulations 

Sun, Jicheng; Gao, Xinliang; Lu, Quanming; Chen, Lunjin; Liu, Xu; Wang, Xueyi; Tao, Xin; Wang, Shui; 0000-0003-2489-3571; 0000-0002-7211-0546; 0000-0002-5059-5394; 0000-0003-3041-2682 (2022-12-01)
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 ...

Statistical correlation of low-altitude ENA emissions with geomagnetic activity from IMAGE/MENA observations 

Mackler, D. A.; Jahn, J-M; Perez, J. D.; Pollock, C. J.; Valek, P. W. (2020-06-03)
Plasma sheet particles transported Earthward during times of active magnetospheric convection can interact with exospheric/thermospheric neutrals through charge exchange. The resulting Energetic Neutral Atoms (ENAs) are ...

Statistical correlation of low-altitude ENA emissions with geomagnetic activity from IMAGE/MENA observations 

Mackler, D; Jahn, J; Perez, J; Pollock, C; Valek, P; 0000-0002-2318-8750 (2022-12-02)
Plasma sheet particles transported Earthward during times of active magnetospheric convection can interact with exospheric/thermospheric neutrals through charge exchange. The resulting Energetic Neutral Atoms (ENAs) are ...

Statistical Study of Foreshock Transients in the Midtail Foreshock 

Liu, Terry; Zhang, Hui; Wang, Chih-Ping; Angelopoulos, Vassilis; Vu, Andrew; Wang, Xueyi; Lin, Yu; 0000-0001-5346-7112; 0000-0003-1778-4289; 0000-0003-2393-6808 (2022-11-08)
In the dayside foreshock, many foreshock transients have been observed and simulated. Because of their strong dynamic pressure perturbations, foreshock transients can disturb the local bow shock, magnetosheath, magnetopause, ...

Statistically Determining the Spatial Extent of Relativistic Electron Precipitation Events Using 2-s Polar-Orbiting Satellite Data 

Gasque, L. Claire; Millan, Robyn; Shekhar, Sapna; 0000-0002-9000-7630; 0000-0002-2815-4998 (2022-10-27)
Relativistic electron precipitation (REP) from the outer radiation belt into Earth's atmosphere poses risks for satellites and affects Earth's climate, producing ozone-destroying compounds. Characterizing the spatial extent ...