Ionospheric plasma flow over large high‐voltage space platforms. I: Ion‐plasma–time scale interactions of a plate at zero angle of attack

1992 ◽  
Vol 4 (6) ◽  
pp. 1597-1614 ◽  
Author(s):  
J. Wang ◽  
D. E. Hastings
Keyword(s):  
High Voltage ◽  
Plasma Flow ◽  
Time Scale ◽  
Ionospheric Plasma ◽  
Angle Of Attack ◽  
Scale Interactions ◽  
Ion Plasma

Ground studies of ionospheric plasma interactions with a high voltage solar array

1990 ◽  
Vol 27 (4) ◽  
pp. 417-424 ◽  
Author(s):  
H. Kuninaka ◽  
Y. Nozaki ◽  
S. Satori ◽  
K. Kuriki
Keyword(s):  
High Voltage ◽  
Ionospheric Plasma ◽  
Solar Array ◽  
Plasma Interactions

scholarly journals Beltrami fields in a hot electron–positron–ion plasma

2012 ◽  
Vol 78 (3) ◽  
pp. 207-210 ◽  
Author(s):  
M. IQBAL ◽  
P. K. SHUKLA
Keyword(s):  
Magnetic Field ◽  
Plasma Flow ◽  
Strong Interaction ◽  
Field Configuration ◽  
Hot Electron ◽  
Magnetic Field Configuration ◽  
Beltrami Fields ◽  
Ion Plasma ◽  
Electron Positron ◽  
Laboratory Plasmas

AbstractA possibility of relaxation of relativistically hot electron and positron (e − p) plasma with a small fraction of hot or cold ions has been investigated analytically. It is observed that a strong interaction of plasma flow and field leads to a non-force-free relaxed magnetic field configuration governed by the triple curl Beltrami (TCB) equation. The triple curl Beltrami (TCB) field composed of three different Beltrami fields gives rise to three multiscale relaxed structures. The results may have the strong relevance to some astrophysical and laboratory plasmas.

scholarly journals Study of the ion plasma flow generated by a high-current vacuum arc

2019 ◽  
Vol 1393 ◽  
pp. 012015 ◽  
Author(s):  
P A Morozov ◽  
I F Punanov ◽  
R V Emlin ◽  
I L Muziukin ◽  
S A Chaikovsky ◽  
...  
Keyword(s):  
Plasma Flow ◽  
Vacuum Arc ◽  
High Current ◽  
Ion Plasma

Optimal perturbation guidance with constraints on terminal flight-path angle and angle of attack

2019 ◽  
Vol 233 (12) ◽  
pp. 4436-4446
Author(s):  
Penglei Zhao ◽  
Wanchun Chen ◽  
Wenbin Yu
Keyword(s):  
Optimal Control ◽  
Singular Perturbation ◽  
Time Scale ◽  
Angle Of Attack ◽  
Flight Path ◽  
Superior Performance ◽  
Optimal Perturbation ◽  
Optimal Guidance ◽  
Flight Path Angle ◽  
Guidance Problem

This paper presents the design of a singular-perturbation-based optimal guidance with constraints on terminal flight-path angle and angle of attack. By modeling the flight-control system dynamics as a first-order system, the angle of attack is introduced into the performance index as a state variable. To solve the resulting high-order optimal guidance problem analytically, the posed optimal guidance problem is divided into two sub-problems by utilizing the singular perturbation method according to two time scales: range, altitude, and flight-path angle are the slow time-scale variables while the angle of attack is the fast time-scale variable. The outer solutions are the optimal control of the slow-scale subsystem. Thereafter, by applying the stretching transformation, the fast-scale subsystem establishes the relationships between the outer solutions and acceleration command. Then, the optimal command can be obtained by solving the fast-scale subsystem also using the optimal control theory. The proposed guidance can achieve a near-zero terminal acceleration as well as a small miss distance. The superior performance of the guidance is demonstrated by adequate trajectory simulations.

Two‐Dimensional Maps of In Situ Ionospheric Plasma Flow Data Near Auroral Arcs Using Auroral Imagery

2019 ◽  
Author(s):  
Robert Clayton ◽  
Kristina Lynch ◽  
Matt Zettergren ◽  
Meghan Burleigh ◽  
Mark Conde ◽  
...  
Keyword(s):  
Plasma Flow ◽  
Ionospheric Plasma ◽  
Two Dimensional ◽  
Flow Data ◽  
Auroral Arcs

scholarly journals Control-Induced Time-Scale Separation for Multiterminal High-Voltage Direct Current Systems Using Droop Control

2020 ◽  
Vol 28 (3) ◽  
pp. 967-983 ◽  
Author(s):  
Yijing Chen ◽  
Miguel Jimenez Carrizosa ◽  
Gilney Damm ◽  
Francoise Lamnabhi-Lagarrigue ◽  
Ming Li ◽  
...  
Keyword(s):  
High Voltage ◽  
Direct Current ◽  
Time Scale ◽  
Droop Control ◽  
Scale Separation ◽  
High Voltage Direct Current ◽  
Time Scale Separation ◽  
Current Systems

Crustal magnetic field advection on Mars from MAVEN observations

2020 ◽  
Author(s):  
Isabela de Oliveira ◽  
Markus Fränz ◽  
Adriane Franco ◽  
Ezequiel Echer
Keyword(s):  
Magnetic Field ◽  
Plasma Flow ◽  
Ionospheric Plasma ◽  
Global Analysis ◽  
Dynamic Pressure ◽  
General Idea ◽  
Mars Atmosphere ◽  
Low Intensity ◽  
Single Orbit ◽  
Field Lines

<p>The plasma environment of Mars is highly influenced by regions of remnant magnetism in the planetary crust, above which mini-magnetospheres are created. In this work, we study whether the ionospheric plasma flow can move crustal magnetic field lines, by the process of advection. According to this hypothesis, the magnetic field lines are dragged away in anti-solar direction, westward at dawn and eastward at dusk-side, due to the day-to-night flow of the ionospheric plasma. The altitude of interest is between 200 km and 1000 km, because the plasma flow velocity is significant in this region.</p><p>MAVEN (Mars Atmosphere and Volatile EvolutioN) data is used for a direct comparison between magnetic field data and a crustal magnetic field model. The difference between the observed and the model field at each point of the grid is a measure of the sum of the induced day magnetic field and the possible displacement of the crustal field lines by advection. The results of the analysis show that, except for the lowest altitude range, minimum value of this difference is always observed for westward shift at dawn-side and eastward shift at dusk-side, in agreement with the expected motion of the crustal magnetic field lines.</p><p>For a general idea of the relative forces between the moving plasma and the crustal fields, we use MAVEN data to analyze the pressures involved in the advection process. These are the dynamic pressure of the ionospheric plasma flow, the magnetic pressure of the field lines and the thermal pressure of the plasma related to the mini-magnetospheres. The balance between these quantities should dictate the occurrence of advection. This analysis suggests that advection could take place at low altitude (up to ~450 km) dawn-side regions above low intensity magnetic fields.</p><p>Although the global analysis results showed agreement with our hypothesis, we could not observe evidence of advection from the local observations in order to unambiguously prove the occurrence of this process. Future works include the investigation of single orbit data in regions of low intensity magnetic field, especially at dawn-side, and also magnetohydrodynamic modeling of the process using the plasma conditions prevalent in the Martian ionosphere.</p>

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