Elastic scattering of electron in neutral plasma: Interaction model and plasma environment effects

2020 ◽  
Vol 27 (11) ◽  
pp. 112701
Author(s):  
W. L. Quan ◽  
X. W. Sun ◽  
Q. F. Chen
Keyword(s):  
Elastic Scattering ◽  
Interaction Model ◽  
Plasma Interaction ◽  
Plasma Environment ◽  
Environment Effects ◽  
Neutral Plasma

scholarly journals Plasma environment effects on K lines of astrophysical interest

2020 ◽  
Vol 643 ◽  
pp. A57
Author(s):  
J. Deprince ◽  
M. A. Bautista ◽  
S. Fritzsche ◽  
J. A. García ◽  
T. R. Kallman ◽  
...  
Keyword(s):  
Accretion Disks ◽  
Compact Object ◽  
Plasma Electron ◽  
Compact Objects ◽  
Emission Rates ◽  
Plasma Environment ◽  
Environment Effects ◽  
Decay Parameters ◽  
Threshold Energies ◽  
Fe Ions

Aims. Within the framework of compact-object accretion disks, we calculate plasma environment effects on the atomic structure and decay parameters used in the modeling of K lines in lowly charged iron ions, namely Fe II–Fe VIII. Methods. For this study, we used the fully relativistic multiconfiguration Dirac–Fock method approximating the plasma electron–nucleus and electron-electron screenings with a time-averaged Debye-Hückel potential. Results. We report modified ionization potentials, K-threshold energies, wavelengths, radiative emission rates, and Auger widths for plasmas characterized by electron temperatures and densities in the ranges 105 − 107 K and 1018 − 1022 cm−3. In addition, we propose two universal fitting formulae to predict the IP and K-threshold lowerings in any elemental ion. Conclusions. We conclude that the high-resolution X-ray spectrometers onboard the future XRISM and ATHENA space missions will be able to detect the lowering of the K edges of these Fe ions due to the extreme plasma conditions occurring in the accretion disks around compact objects.

scholarly journals Real-time 3-D hybrid simulation of Titan's plasma interaction during a solar wind excursion

2009 ◽  
Vol 27 (9) ◽  
pp. 3349-3365 ◽  
Author(s):  
S. Simon
Keyword(s):  
Magnetic Field ◽  
Solar Wind ◽  
Real Time ◽  
Plasma Flow ◽  
Time Scale ◽  
Hybrid Simulation ◽  
The Moon ◽  
Plasma Interaction ◽  
Plasma Environment ◽  
The Magnetic Field

Abstract. The plasma environment of Saturn's largest satellite Titan is known to be highly variable. Since Titan's orbit is located within the outer magnetosphere of Saturn, the moon can leave the region dominated by the magnetic field of its parent body in times of high solar wind dynamic pressure and interact with the thermalized magnetosheath plasma or even with the unshocked solar wind. By applying a three-dimensional hybrid simulation code (kinetic description of ions, fluid electrons), we study in real-time the transition that Titan's plasma environment undergoes when the moon leaves Saturn's magnetosphere and enters the supermagnetosonic solar wind. In the simulation, the transition between both plasma regimes is mimicked by a reversal of the magnetic field direction as well as a change in the composition and temperature of the impinging plasma flow. When the satellite enters the solar wind, the magnetic draping pattern in its vicinity is reconfigured due to reconnection, with the characteristic time scale of this process being determined by the convection of the field lines in the undisturbed plasma flow at the flanks of the interaction region. The build-up of a bow shock ahead of Titan takes place on a typical time scale of a few minutes as well. We also analyze the erosion of the newly formed shock front upstream of Titan that commences when the moon re-enters the submagnetosonic plasma regime of Saturn's magnetosphere. Although the model presented here is far from governing the full complexity of Titan's plasma interaction during a solar wind excursion, the simulation provides important insights into general plasma-physical processes associated with such a disruptive change of the upstream flow conditions.

Satellite SGEMP Response in a Neutral Plasma Environment

1980 ◽  
Vol 27 (6) ◽  
pp. 1560-1565 ◽  
Author(s):  
T. A. Tumolillo ◽  
J. P. Wondra ◽  
D. Walters
Keyword(s):  
Plasma Environment ◽  
Neutral Plasma

scholarly journals Plasma-environment effects on K lines of astrophysical interest

2020 ◽  
Vol 635 ◽  
pp. A70
Author(s):  
J. Deprince ◽  
M. A. Bautista ◽  
S. Fritzsche ◽  
J. A. García ◽  
T. R. Kallman ◽  
...  
Keyword(s):  
Accretion Disks ◽  
Plasma Electron ◽  
Compact Objects ◽  
Emission Rates ◽  
Plasma Environment ◽  
Black Hole Accretion ◽  
Environment Effects ◽  
Threshold Energies ◽  
Hole Accretion ◽  
Atomic Parameters

Aims. In the context of black-hole accretion disks, we aim to compute the plasma-environment effects on the atomic parameters used to model the decay of K-vacancy states in moderately charged iron ions, namely Fe IX – Fe XVI. Methods. We used the fully relativistic multiconfiguration Dirac–Fock method approximating the plasma electron–nucleus and electron–electron screenings with a time-averaged Debye–Hückel potential. Results. We report modified ionization potentials, K-threshold energies, wavelengths, radiative emission rates, and Auger widths for plasmas characterized by electron temperatures and densities in the ranges 105−107 K and 1018−1022 cm−3. Conclusions. This study confirms that the high-resolution X-ray spectrometers onboard the future XRISM and Athena space missions will be capable of detecting the lowering of the K edges of these ions due to the extreme plasma conditions occurring in accretion disks around compact objects.

scholarly journals Plasma environment effects on K lines of astrophysical interest

2019 ◽  
Vol 624 ◽  
pp. A74 ◽  
Author(s):  
J. Deprince ◽  
M. A. Bautista ◽  
S. Fritzsche ◽  
J. A. García ◽  
T. R. Kallman ◽  
...  
Keyword(s):  
Black Hole ◽  
Electron Temperature ◽  
Accretion Disks ◽  
Atomic Structure ◽  
Radiative Transition ◽  
Ionization Potentials ◽  
Plasma Environment ◽  
Black Hole Accretion ◽  
Environment Effects ◽  
Hole Accretion

Aims. In the context of black-hole accretion disks, the main goal of the present study is to estimate the plasma environment effects on the atomic structure and radiative parameters associated with the K-vacancy states in ions of the oxygen isonuclear sequence. Methods. We used a time-averaged Debye–Hückel potential for both the electron–nucleus and the electron–electron interactions implemented in the fully relativistic multiconfiguration Dirac–Fock (MCDF) method. Results. Modified ionization potentials, K thresholds, Auger widths, and radiative transition wavelengths and rates are reported for O I–O VII in plasma environments with electron temperature and density ranges 105−107 K and 1018−1022 cm−3.

scholarly journals Plasma environment effects on K lines of astrophysical interest

2019 ◽  
Vol 626 ◽  
pp. A83 ◽  
Author(s):  
J. Deprince ◽  
M. A. Bautista ◽  
S. Fritzsche ◽  
J. A. García ◽  
T. Kallman ◽  
...  
Keyword(s):  
Accretion Disks ◽  
Electron Plasma ◽  
Compact Objects ◽  
Emission Rates ◽  
Astrophysical Plasmas ◽  
X Ray ◽  
Radiative Emission ◽  
Plasma Environment ◽  
Environment Effects ◽  
Atomic Parameters

Aims. In the context of accretion disks around black holes, we estimate plasma-environment effects on the atomic parameters associated with the decay of K-vacancy states in highly charged iron ions, namely Fe XVII – Fe XXV. Methods. Within the relativistic multiconfiguration Dirac–Fock (MCDF) framework, the electron–nucleus and electron–electron plasma screenings were approximated with a time-averaged Debye–Hückel potential. Results. Modified ionization potentials, K thresholds, wavelengths, radiative emission rates, and Auger widths are reported for astrophysical plasmas characterized by electron temperatures and densities in the ranges 105 − 107 K and 1018 − 1022 cm−3, respectively. Conclusions. We conclude that the high-resolution microcalorimeters on board future X-ray missions such as XRISM and ATHENA are expected to be sensitive to the lowering of the iron K edge due to the extreme plasma conditions occurring in accretion disks around compact objects.

scholarly journals Linear conversion theory on the second harmonic emission from a plasma filament

1989 ◽  
Vol 7 (1) ◽  
pp. 131-138 ◽  
Author(s):  
Tan Weihan ◽  
Gu Min
Keyword(s):  
Energy Flux ◽  
Second Harmonic ◽  
Interaction Model ◽  
Incident Laser ◽  
Plasma Interaction ◽  
Plasma Filament ◽  
Harmonic Emission ◽  
Linear Conversion ◽  
Plasma Filaments ◽  
Planar Wave

The linear conversion theory of laser produced plasma filaments is studied in this paper. By calculations for the energy flux of the second harmonic emission on the basis of the planar wave-plasma interaction model, it has been found that there exists no 2ω0 harmonic emission in the direction perpendicular to the incident laser, in contradiction with the experiments. Therefore, we have proposed a linear conversion theory on the second harmonic emission from a plasma filament and discovered the intense 2ω0 harmonic emission in the direction perpendicular to the incident laser, which is in agreement with the experiments.

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