New methodology for measuring electron density perturbations caused by plasma coherent modes using profile reflectometry: Magnitudes and radial profiles in DIII-D

2021 ◽  
Vol 92 (4) ◽  
pp. 043550
Author(s):  
L. Zeng ◽  
N. A. Crocker ◽  
T. L. Rhodes ◽  
W. A. Peebles
Keyword(s):  
Electron Density ◽  
Radial Profiles ◽  
Density Perturbations

Radial Profiles of Electron Density and Current Components at Cathode Surface in LaB6Hollow Cathode Arc

1987 ◽  
Vol 26 (Part 1, No. 6) ◽  
pp. 919-923 ◽  
Author(s):  
Setsuo Suzuki ◽  
Toshiaki Asano ◽  
Osami Morimiya
Keyword(s):  
Electron Density ◽  
Cathode Surface ◽  
Radial Profiles ◽  
Cathode Arc

EISCAT observations of large scale electron temperture and electron density perturbations caused by high power HF radio waves

1992 ◽  
Vol 54 (11-12) ◽  
pp. 1555-1572 ◽  
Author(s):  
A.J. Stocker ◽  
F. Honary ◽  
T.R. Robinson ◽  
T.B. Jones ◽  
P. Stubbe ◽  
...  
Keyword(s):  
Electron Density ◽  
High Power ◽  
Large Scale ◽  
Radio Waves ◽  
Density Perturbations

scholarly journals The intracluster magnetic field in the double relic galaxy cluster Abell 2345

2021 ◽  
Vol 502 (2) ◽  
pp. 2518-2535
Author(s):  
C Stuardi ◽  
A Bonafede ◽  
L Lovisari ◽  
P Domínguez-Fernández ◽  
F Vazza ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Power Spectrum ◽  
Electron Density ◽  
Galaxy Clusters ◽  
Radial Profile ◽  
Electron Density Profile ◽  
Thermal Electron ◽  
X Ray ◽  
Radial Profiles

ABSTRACT Magnetic fields are ubiquitous in galaxy clusters, yet their radial profile, power spectrum, and connection to host cluster properties are poorly known. Merging galaxy clusters hosting diffuse polarized emission in the form of radio relics offer a unique possibility to study the magnetic fields in these complex systems. In this paper, we investigate the intracluster magnetic field in Abell 2345. This cluster hosts two radio relics that we detected in polarization with 1–2 GHz Jansky Very Large Array observations. X-ray XMM–Newton images show a very disturbed morphology. We derived the rotation measure (RM) of five polarized sources within ∼1 Mpc from the cluster centre applying the RM synthesis. Both, the average RM and the RM dispersion radial profiles probe the presence of intracluster magnetic fields. Using the thermal electron density profile derived from X-ray analysis and simulating a 3D magnetic field with fluctuations following a power spectrum derived from magneto-hydrodynamical cosmological simulations, we build mock RM images of the cluster. We constrained the magnetic field profile in the eastern radio relic sector by comparing simulated and observed RM images. We find that, within the framework of our model, the data require a magnetic field scaling with thermal electron density as B(r) ∝ ne(r). The best model has a central magnetic field (within a 200 kpc radius) of 2.8$\pm 0.1 \ \mu$G. The average magnetic field at the position of the eastern relic is $\sim 0.3 \ \mu$G, a factor 2.7 lower than the equipartition estimate.

Rocket Electron Density Perturbations in the Ionosphere

Nature ◽  
1967 ◽  
Vol 214 (5089) ◽  
pp. 690-692
Author(s):  
W. J. G. BEYNON
Keyword(s):  
Electron Density ◽  
Density Perturbations

scholarly journals Diagnostics of dusty plasma properties in planar magnetron sputtering device

2019 ◽  
Vol 13 (26) ◽  
pp. 64-75
Author(s):  
Qusay A. Abbas
Keyword(s):  
Electron Temperature ◽  
Electron Density ◽  
Discharge Current ◽  
Plasma Potential ◽  
Dust Particles ◽  
Plasma Parameters ◽  
Plasma Properties ◽  
Radial Profiles ◽  
Planar Magnetron ◽  
Radial Axis

The effect of Al dust particles on glow discharge regions, dischargevoltage, discharge current, plasma potential, floating potential,electron density and electron temperature in planar magnetronsputtering device has been studied experimentally. Four cylindricalLangmuir probes were employed to measure plasma parameters atdifferent point on the radial axis of plasma column. The resultsshows the present of Al dust causes to increase the discharge voltageand reduce the discharge current. There are two electron groups inthe present and absent of Al dust particles. The radial profiles ofplasma parameters in the present of dust are non- uniform. Thefloating potential of probe becomes more negatively while theplasma potential becomes positive when the dust immersed intoplasma region. The electron density increases in the present of dustparticle which lead to decreases the electron temperature.

scholarly journals Decay form of the echo amplitude and echo phase of typical early/fast VLF event on 19.8 kHz signal

2010 ◽  
Vol 28 (1) ◽  
pp. 74
Author(s):  
Abhikesh Kumar ◽  
Sushil Kumar
Keyword(s):  
Theoretical Model ◽  
Electron Density ◽  
Wave Scattering ◽  
Lower Ionosphere ◽  
Exponential Fitting ◽  
Simple Theoretical Model ◽  
Density Perturbations ◽  
Decay Form

In this paper, the echo amplitude (M) and echo phase (ø) of typical early/fast events on NWC (19.8 kHz) signal received at Suva, Fiji, are modelled to determine their form of recovery (decay). We applied logarithmic and exponential fitting formulas for M and ø obtained using a simple theoretical model of VLF wave scattering from lightning-induced electron density perturbations in the lower ionosphere and found that they are highly logarithmic.

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