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Physics: Recent submissions

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Generation of anomalous flows near the bow shock by its interaction with interplanetary discontinuities 

Lin, Yu; 0000-0001-8003-9252 (2020-06-30)
Two-dimensional hybrid simulations using a curvilinear coordinate system are carried out to study the interaction of the Earth's bow shock (BS) with an interplanetary directional discontinuity. In particular, plasma flow ...

Three-dimensional MHD simulations of interplanetary rotational discontinuities impacting the Earth's bow shock and magnetosheath 

Cable, S.; Lin, Y.; 0000-0001-8003-9252 (2020-06-30)
The first ever fully three-dimensional magnetohydrodynamic (MHD) simulations of the detailed effects of MHD discontinuities on the magnetosheath have been performed. The simulation results predict that the interaction ...

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 ...

Magnetic field rotation and transition width in rotational discontinuities and Alfven wave trains 

Lin, Y.; Lee, LC.; 0000-0001-8003-9252 (2020-06-30)
A hybrid simulation is carried out to study the evolution of magnetic field rotations in rotational discontinuities (RDs) and large-amplitude Alfven wave trains (AWTs) whose initial field rotation angle \Delta Phi\ > 180 ...

Two-dimensional hybrid simulation of the dayside reconnection layer and associated ion transport 

Xie, H.; Lin, Y.; 0000-0001-8003-9252 (2020-06-30)
The structure of the reconnection layer at the dayside magnetopause is studied by using a two-dimensional (2-D) hybrid code. The simulation domain is a rectangle in the at plane around an X line at the magnetopause. In our ...

Two-dimensional global hybrid simulation of pressure evolution and waves in the magnetosheath 

Lin, Y; Denton, RE; Lee, LC; Chao, JK; 0000-0001-8003-9252 (2020-06-30)
A two-dimensional hybrid simulation is carried out for the global structure of the magnetosheath. Quasi-perpendicular magnetosonic/fast mode waves with large-amplitude in-phase oscillations of the magnetic field and the ...

Lattice thermal conductivity of MgO at conditions of Earth's interior 

Tang, Xiaoli; Dong, Jianjun (2020-06-29)
Thermal conductivity of the Earth’s lower mantle greatly impacts the mantle convection style and affects the heat conduction from the core to the mantle. Direct laboratory measurement of thermal conductivity of mantle ...

Global hybrid simulation of the dayside reconnection layer and associated field-aligned currents 

Lin, Y.; 0000-0001-8003-9252 (2020-06-26)
A two-dimensional global hybrid simulation is carried out to study the structure of the magnetopause boundary layer in the noon-midnight meridian plane associated with the dayside reconnection. In the simulation the bow ...

Outflow from the ionosphere in the vicinity of the cusp 

Valek, PW; Perez, JD; Jahn, JM; Pollock, CJ; Wuest, MP; Friedel, RHW; Moore, TE; Peterson, WK (2020-06-26)
Low-energy ion outflows from the ionosphere are known to be an important source of plasma for the magnetosphere. The objective of this study is to describe the spatial relationships between low-energy ionospheric outflows ...

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

Lin, Y.; Swift, DW; 0000-0001-8003-9252 (2020-06-25)
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 sheet. ...

DAVIS: A direct algorithm for velocity-map imaging system 

Harrison, G. R.; Vaughan, J. C.; Hidle, B.; Laurent, G. M.; https://orcid.org/0000-0002-3700-7412 (2020-06-25)
In this work, we report a direct (non-iterative) algorithm to reconstruct the three-dimensional (3D) momentum-space picture of any charged particles collected with a velocity-map imaging system from the two-dimensional ...

DAVIS: A direct algorithm for velocity-map imaging system 

Harrison, G. R.; Vaughan, J. C.; Hidle, B.; Laurent, G. M.; https://orcid.org/0000-0002-3700-7412 (2020-06-25)
In this work, we report a direct (non-iterative) algorithm to reconstruct the three-dimensional (3D) momentum-space picture of any charged particles collected with a velocity-map imaging system from the two-dimensional ...

Radiation pressure measurements on micron-size individual dust grains 

Abbas, MM; Thomas, E.; 0000-0002-7747-0284 (2020-06-18)
Measurements of electromagnetic radiation pressure have been made on individual silica (SiO2) particles levitated in an electrodynamic balance. These measurements were made by inserting single charged particles of known ...

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

Lin, Yu; 0000-0001-8003-9252 (2020-06-18)
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 ...

Dynamics of ring current ions as obtained from IMAGE HENA and MENA ENA images 

Perez, JD; Zhang, XX; Brandt, PCS; Mitchell, DG; Jahn, JM; Pollock, CJ (2020-06-18)
Ion distributions from three storms in the year 2000 have been obtained from HENA and MENA ENA images at 27-39 keV and 5-12 keV, respectively. The observed motion of the ring current is compared with calculations of expected ...

Trapped and precipitating protons in the inner magnetosphere as seen by IMAGE 

Perez, JD; Zhang, XX; Brandt, PC; Mitchell, DG; Jahn, JM; Pollock, CJ; Mende, SB (2020-06-18)
[1] Images from the IMAGE satellite of precipitating protons (SU12/FUV) and trapped protons at 8.5 (MENA) and 33 keV (HENA) are compared during three periods: ( 1) 12 August 2000 from 1000 UT to 1145 UT just after the peak ...

Global patterns of Joule heating in the high-latitude ionosphere 

Zhang, XX; Wang, C.; Chen, T.; Wang, YL; Tan, A; Wu, TS; Germany, GA; Wang, W (2020-06-18)
[1] A compiled empirical global Joule heating (CEJH) model is described in this study. This model can be used to study Joule heating patterns, Joule heating power, potential drop, and polar potential size in the high-latitude ...

Three-dimensional global hybrid simulation of dayside dynamics associated with the quasi-parallel bow shock 

Lin, Y.; Wang, XY; 0000-0001-8003-9252; 0000-0001-5533-5981 (2020-06-18)
A three-dimensional global-scale hybrid simulation is carried out, for the first time, for dynamics of the dayside bow shock-magnetosphere system associated with the quasi-parallel bow shock. A case with IMF along the ...

Overlap of the plasmasphere and ring current: Relation to subauroral ionospheric heating 

Gurgiolo, C.; Sandel, BR; Perez, JD; Mitchell, DG; Pollock, CJ; Larsen, BA (2020-06-18)
The overlap of the ring current with the outer plasmasphere is thought to play a major role in storm-time related increases in the subauroral ambient topside electron temperature. Instabilities generated within the overlap ...

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

Sun, Xiaoxia; Lin, Yu; Wang, Xiaogang; 0000-0001-8003-9252 (2020-06-18)
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 ...