Scattering of Electromagnetic Waves by Electro-Acoustic Plasma Waves

Nature ◽  
1966 ◽  
Vol 209 (5027) ◽  
pp. 972-974 ◽  
Author(s):  
P. F. LITTLE ◽  
S. M. HAMBERGER
Keyword(s):  
Electromagnetic Waves ◽  
Plasma Waves

Harmonic Responses In 2DEG AlGaAs/GaAs HEMT Devices Due To Plasma Wave Interactions

2012 ◽  
Author(s):  
Abdul Manaf Hashim ◽  
Seiya Kasai ◽  
Hideki Hasegawa
Keyword(s):  
Plasma Wave ◽  
Electron Mobility ◽  
Electromagnetic Waves ◽  
Field Effect Transistors ◽  
High Electron Mobility Transistor ◽  
Plasma Waves ◽  
Thz Radiation ◽  
High Electron ◽  
Short Channel ◽  
High Electron Mobility

Gelombang plasma adalah ayunan kepadatan elektron dalam ruang masa, dan di dalam submikro transistor kesan medan, frekuensi plasma khas, ωp, terletak dalam julat terahertz (THz) dan tidak melibatkan peralihan kuantum. Maka, ayunan THz dapat dikesan dan/atau dihasilkan dengan menggunakan ransangan gelombang plasma. Dalam kertas kerja ini, dapat dikaji kaitan gelombang plasma antara penghantaran gelombang plasma dalam saluran pendek transistor pergerakan elektron tinggi (high–electron–mobility transistor – HEMT) dan yang terpancar dari gelombang elektromagnet. Berdasarkan ekperimen, kami telah membuktikan pengesanan radiasi terahertz (THz) oleh AlGaAs /GaAs HEMT hingga harmonik ketiga dalam suhu bilik dan hasil resonan bertepatan dengan hasil kiraan. Kata kunci: Gelombang permukaan plasma; plasma hanyut; peranti THz; GaAs; HEMT Plasma waves are oscillations of electron density in time and space, and in deep submicron field effect transistors, typical plasma frequencies, ωp, lie in the terahertz (THz) range and do not involve any quantum transitions. Hence, using plasma wave excitation for detection and/or generation of THz oscillations is a very promising approach. In this paper, the investigation of plasma wave interaction between the plasma waves propagating in a short–channel High–Electron–Mobility Transistor (HEMT) and that of the radiated electromagnetic waves was carried out. Experimentally, we have demonstrated the detection of the terahertz (THz) radiation by an AlGaAs/GaAs HEMT up to third harmonic at room temperature and their resonant responses show very good agreement with the calculated results. Key words: Surface plasma waves; drift plasma; THz device, GaAs; HEMT

scholarly journals Whistler waves observed by Solar Orbiter during its first orbit

2021 ◽  
Author(s):  
Matthieu Kretschmar ◽  
Thomas Chust ◽  
Daniel Graham ◽  
Volodya Krasnosekskikh ◽  
Lucas Colomban ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Solar Wind ◽  
Electromagnetic Waves ◽  
Heliocentric Distance ◽  
Plasma Waves ◽  
Distribution Functions ◽  
The Sun ◽  
Whistler Waves ◽  
Velocity Distribution Functions ◽  
The Waves

<p>Plasma waves can play an important role in the evolution of the solar wind and the particle velocity distribution functions in particular. We analyzed the electromagnetic waves observed above a few Hz by the Radio Plasma Waves (RPW) instrument suite onboard Solar Orbiter, during its first orbit, which covered a distance from the Sun between 1 AU and 0.5 AU.  We identified the majority of the detected waves as whistler waves with frequency around  0.1 f_ce and right handed circular polarisation. We found these waves to be mostly aligned or anti aligned with the ambient magnetic field, and rarely oblique. We also present and discuss their direction of propagation and the variation of the waves' properties with heliocentric distance.</p>

Interaction between electromagnetic waves and plasma waves in motional plasma

2009 ◽  
Vol 16 (6) ◽  
pp. 062107 ◽  
Author(s):  
S. Y. Chen ◽  
M. Gao ◽  
C. J. Tang ◽  
X. D. Peng
Keyword(s):  
Electromagnetic Waves ◽  
Plasma Waves

High-informative version of nonlinear transformation of Langmuir waves to electromagnetic waves

2013 ◽  
Vol 80 (2) ◽  
pp. 289-318 ◽  
Author(s):  
Vasily I. Erofeev
Keyword(s):  
Correlation Analysis ◽  
Electromagnetic Waves ◽  
Plasma Waves ◽  
Langmuir Waves ◽  
Basic Principles ◽  
Plasma Kinetics ◽  
Nonlinear Plasma ◽  
Theor Phys ◽  
Plasma Kinetic ◽  
Plasma Theory

AbstractThe concept of informativeness of nonlinear plasma physical scenario is discussed. Basic principles for heightening the informativeness of plasma kinetic models are explained. Formerhigh-informative correlation analysis of plasma kinetics(Erofeev, V. 2011High-Informative Plasma Theory, Saarbrücken: LAP) is generalized for studies of weakly turbulent plasmas that contain fields of solenoidal plasma waves apart from former potential ones. Respective machinery of plasma kinetic modeling is applied to an analysis of fusion of Langmuir waves with transformation to electromagnetic waves. It is shown that the customary version of this phenomenon (Terashima, Y. and Yajima, N. 1963Prog. Theor. Phys.30, 443; Akhiezer, I. A., Danelia, I. A. and Tsintsadze, N. L. 1964Sov. Phys. JETP19, 208; Al'tshul', L. M. and Karpman, V. I. 1965Sov. Phys. JETP20, 1043) substantially distorts the picture of merging of Langmuir waves with long wavelengths (λ ≳c/ωpe).

Possible Causes of Line Splitting in Drift Pair Solar Bursts

1971 ◽  
Vol 2 (1) ◽  
pp. 56-57 ◽  
Author(s):  
D. B. Melrose ◽  
W. Sy
Keyword(s):  
Electromagnetic Waves ◽  
Solar Radio ◽  
Plasma Frequency ◽  
Plasma Waves ◽  
Electron Plasma ◽  
Radio Bursts ◽  
Solar Radio Bursts ◽  
Basic Model ◽  
Line Splitting ◽  
Solar Bursts

In this paper possible causes of line splitting in emission near the local plasma frequency are considered in connection with drift pair solar radio bursts. The basic model envisaged for the bursts involves a bunch of electrons streaming through the solar corona at several times the thermal velocity of electrons. The emission process assumed is the transformation of coherently generated electron plasma waves (I-waves) into electromagnetic waves (t-waves) with little change in frequency.

scholarly journals Source location of chorus emissions observed by Cluster

2003 ◽  
Vol 21 (2) ◽  
pp. 473-480 ◽  
Author(s):  
M. Parrot ◽  
O. Santolík ◽  
N. Cornilleau-Wehrlin ◽  
M. Maksimovic ◽  
C. C. Harvey
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Waves ◽  
Plasma Waves ◽  
Magnetic Activity ◽  
Spectral Matrix ◽  
Chorus Waves ◽  
Storms And Substorms ◽  
Wave Normal ◽  
The Magnetic Field ◽  
Different Levels

Abstract. One of the objectives of the Cluster mission is to study sources of various electromagnetic waves using the four satellites. This paper describes the methods we have applied to data recorded from the STAFF spectrum analyser. This instrument provides the cross spectral matrix of three magnetic and two electric field components. This spectral matrix is analysed to determine, for each satellite, the direction of the wave normal relative to the Earth’s magnetic field as a function of frequency and of time. Due to the Cluster orbit, chorus emissions are often observed close to perigee, and the data analysis determines the direction of these waves. Three events observed during different levels of magnetic activity are reported. It is shown that the component of the Poynting vector parallel to the magnetic field changes its sense when the satellites cross the magnetic equator, which indicates that the chorus waves propagate away from the equator. Detailed analysis indicates that the source is located in close vicinity of the plane of the geomagnetic equator. Key words. Magnetospheric physics (plasma waves and instabilities; storms and substorms); Space plasma physics (waves and instabilities)

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