scholarly journals Heliospheric energetic neutral atoms: Non-stationary modelling and comparison with IBEX-Hi data

2020 ◽  
Vol 499 (1) ◽  
pp. 441-454
Author(s):  
I I Baliukin ◽  
V V Izmodenov ◽  
D B Alexashov
Keyword(s):  
Magnetic Field ◽  
Velocity Distribution Function ◽  
Neutral Atoms ◽  
Thermal Component ◽  
Pickup Ions ◽  
Model Calculations ◽  
Energetic Neutral Atoms ◽  
Key Factor ◽  
Globally Distributed ◽  
Good Agreement

ABSTRACT The interstellar boundary explorer (IBEX) has been measuring fluxes of the energetic neutral atoms (ENAs) using the IBEX-Hi (0.3–6 keV) instrument since 2008. We have developed a numerical time-depended code to calculate globally distributed flux (GDF) of hydrogen ENAs employing both (1) 3D kinetic-MHD model of the global heliosphere and (2) reconstruction of atom trajectories from 1 au, where they are observed by IBEX, to the point of their origin in the inner heliosheath (IHS). The key factor in the simulation is a detailed kinetic consideration of the pickup ions (PUIs), the supra-thermal component of protons in the heliosphere, which is ‘parental’ to the ENAs and originates in the region of the supersonic solar wind being picked by the heliospheric magnetic field. As a result of our study, we have concluded that (1) the developed model is able to reproduce the geometry of the multilobe structure seen in the IBEX-Hi GDF maps, (2) the GDF is extremely sensitive to the form of the velocity distribution function of PUIs in the IHS, and the accounting for the existence of an additional energetic population of PUIs is essential to explain the data, (3) despite a relatively good agreement, there are some quantitative differences between the model calculations and IBEX-Hi data. Possible reasons for these differences are discussed.

scholarly journals CHARTING THE INTERSTELLAR MAGNETIC FIELD CAUSING THEINTERSTELLAR BOUNDARY EXPLORER(IBEX) RIBBON OF ENERGETIC NEUTRAL ATOMS

2015 ◽  
Vol 814 (2) ◽  
pp. 112 ◽  
Author(s):  
P. C. Frisch ◽  
A. Berdyugin ◽  
V. Piirola ◽  
A. M. Magalhaes ◽  
D. B. Seriacopi ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Neutral Atoms ◽  
Energetic Neutral Atoms

PICKUP IONS FROM ENERGETIC NEUTRAL ATOMS

2010 ◽  
Vol 712 (2) ◽  
pp. L157-L159 ◽  
Author(s):  
N. A. Schwadron ◽  
D. J. McComas
Keyword(s):  
Neutral Atoms ◽  
Pickup Ions ◽  
Energetic Neutral Atoms

Effect of Magnetic Fields on the Resistance and Microstructure of Al-Cu Alloy during Solidification Processing

2011 ◽  
Vol 287-290 ◽  
pp. 2916-2920
Author(s):  
Chun Yan Ban ◽  
Peng Qian ◽  
Xu Zhang ◽  
Qi Xian Ba ◽  
Jian Zhong Cui
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Turning Points ◽  
Probe Method ◽  
Solidification Processing ◽  
Ac Magnetic Field ◽  
Dc Magnetic Field ◽  
Cu Alloy ◽  
The Difference ◽  
Good Agreement

The resistance of Al-21%Cu alloy under no magnetic field, DC magnetic field and AC magnetic field from liquid to solid was measured by a four-probe method. The difference of resistance versus temperature curves (R-T curves) was analyzed. It is found that the R-T curves of Al-21%Cu alloy are monotone decreasing and have two obvious turning points. Under DC magnetic field, the liquidus and solidus temperatures of the alloy both decrease, while under AC magnetic field, the liquidus and solidus temperatures both increase. There is a good agreement between the microstructure of quenching sample and R-T curves. The mechanism of the effect of magnetic fields was discussed.

Research on a Magnetic-Electrochemical Compound Polishing Head

2014 ◽  
Vol 800-801 ◽  
pp. 858-863
Author(s):  
Li Min Shi
Keyword(s):  
Magnetic Field ◽  
Electrochemical Reaction ◽  
Electrical Field ◽  
Key Factor ◽  
Polishing Tool

In the paper, a new polishing head is researched and developed. How to set a magnetic feild is a key factor in magnetic-electrochemical compound polishing. To add a magnetic field that is parallel to electrical field, the electrochemical reaction can be changed greatly. Additionally, to add a magnetic field whose direction is changed to and fro, the efficiency of the polishing can be improved especially. In order to adapt to this theory, a new polishing head in magnec-electrochemical compound polishing is required resarch and development. Furthermore,the tool can be fixed on spindle of CNC easily and the tool is flexible so it can make the polishing head and workpiece touch evenly each other. Especially being noticed, the head of magnetic-electrochemical compound polishing tool is a series in order that the head can be replaced conveniently according to different surface. At last, the tool is tested and its function is perfect.

Effects of repeated interactions and correlational disintegration on kinetic and transport properties of a non-neutral plasma in strong fields

1990 ◽  
Vol 44 (1) ◽  
pp. 167-190 ◽  
Author(s):  
Alf H. Øien
Keyword(s):  
Magnetic Field ◽  
Particle Transport ◽  
Axial Magnetic Field ◽  
Debye Length ◽  
Electron Plasma ◽  
Larmor Radius ◽  
Equilibration Time ◽  
Cylindrically Symmetric ◽  
Electric Potentials ◽  
Good Agreement

Collisions in a cylindrically symmetric non-neutral (electron) plasma, where the Larmor radius is much smaller than the Debye length, and the consequent particle transport, are studied. The plasma is confined radially by a strong axial magnetic field and axially by electric potentials. Hence two particles may interact repeatedly. Eventually they drift too far away from each other poloidally to interact any more, owing to shear in the E × B drift. The consequent build-up of correlation is limited by correlational disintegration due to collisions with ‘third particles’ between the repeated interactions. A kinetic equation including these effects is derived, and the cross-field particle transport along the density gradient is found. An associated equilibration time is shown to scale as B and to be in good agreement with the experimentally obtained values of Briscoli, Malmberg and Fine.

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