scholarly journals Excitation Of Cyclotron Electromagnetic Waves In A Magnetoactive Plasma By A Stream Of Charged Particles, Including Temperature Effects In The Stream

1966 ◽  
Vol 19 (4) ◽  
pp. 489 ◽  
Keyword(s):  
Magnetic Field ◽  
Growth Rate ◽  
Charged Particle ◽  
Temperature Effects ◽  
Electromagnetic Waves ◽  
Charged Particles ◽  
Magnetoactive Plasma ◽  
Particle Stream ◽  
Wave Normal ◽  
Normal Angle

The dispersion equation for cyclotron electromagnetic waves in a system comprising a charged particle stream injected at an angle to the static magnetic field of a magnetoactive plasma is derived for a general wave�normal angle () when the temperature of the stream has been taken into account. The expression for the growth rate is derived in general for all cyclotron waves.

Interaction of a highly relativistic helical electron stream and a cold magnetoactive plasma

1969 ◽  
Vol 47 (2) ◽  
pp. 161-177 ◽  
Author(s):  
P. C. W. Fung
Keyword(s):  
Magnetic Field ◽  
Growth Rate ◽  
Static Magnetic Field ◽  
Pitch Angle ◽  
Magnetoactive Plasma ◽  
Electron Stream ◽  
Amplification Rate ◽  
Wave Normal ◽  
Normal Angle ◽  
Temporal Growth Rate

When a nearly monoenergetic relativistic electron stream is gyrating along a cold magnetoactive plasma with general pitch angle Φ (defined as the angle between the static magnetic field of the plasma and the momentum of a particle in the stream), the system is shown to be radiatively unstable with respect to synchrotron radiation. Using the classical kinetic approach, the temporal growth rate is derived for general wave-normal angle θ (defined as the angle between the static magnetic field and wave vector k). Deducing the spatial amplification rate from the temporal growth rate, the result obtained here is shown to be identical with that obtained from the Einstein-coefficients approach deduced by Fung earlier.

On the instability of synchrotron radiation

1968 ◽  
Vol 46 (9) ◽  
pp. 1073-1081 ◽  
Author(s):  
P. C. W. Fung
Keyword(s):  
Growth Rate ◽  
Synchrotron Radiation ◽  
Magnetoactive Plasma ◽  
Kinetic Approach ◽  
Relativistic Electrons ◽  
Wave Normal ◽  
Quantum Treatment ◽  
Normal Angle

In a system of isotropic relativistic electrons which is embedded in a cold ambient magnetoactive plasma, the growth rate of synchrotron radiation at wave normal angle θ = 90° is derived by means of the classical kinetic approach. It is shown that the result is identical with that obtained from the quantum treatment. Two errors occurring in the literature of synchrotron radiation are pointed out. The growth rate is computed for the case of monoenergetic electrons as an example.

Oblique whistler-mode propagation in a hot anisotropic plasma

1982 ◽  
Vol 27 (2) ◽  
pp. 199-204 ◽  
Author(s):  
S. S. Sazhin ◽  
E. M. Sazhina
Keyword(s):  
Magnetic Field ◽  
Dispersion Relation ◽  
Plasma Temperature ◽  
Anisotropic Plasma ◽  
Mode Propagation ◽  
Whistler Mode ◽  
Energy Focusing ◽  
Wave Normal ◽  
The Magnetic Field ◽  
Normal Angle

An approximate dispersion relation is obtained for quasi-longitudinal whistler mode propagation in the hot anisotropic plasma. The influence of plasma temperature and anisotropy on whistler energy focusing along the magnetic field and whistler trapping in the magnetospheric ducts are considered for the case when the whistler wave normal angle is not equal to zero.

scholarly journals Magnetic motion of spherical frictional charged particles on the unit sphere

2019 ◽  
Vol 65 (5 Sept-Oct) ◽  
pp. 496 ◽  
Author(s):  
Talat Körpınar ◽  
Ridvan Cem Demirkol
Keyword(s):  
Magnetic Field ◽  
Charged Particle ◽  
Potential Energy ◽  
Frictional Force ◽  
Poynting Vector ◽  
Positive Curvature ◽  
Charged Particles ◽  
Energy Functional ◽  
Ordinary Space ◽  
Potential Energy Functional

Mathematically, the sphere unit S² is described to be a 2-sphere in an ordinary space with a positive curvature. In this study, we aim to present the manipulation of a spherical charged particle in a continuous motion with a magnetic field on the sphere S² while it is exposed to a frictional force. In other words, we effot to derive the exact geometric characterization for the spherical charged particle under the influence of a frictional force field on the unit 2-sphere. This approach also helps to discover some physical and kinematical characterizations belonging to the particle such as the magnetic motion, the torque, the potential energy functional, and the Poynting vector.

Orbits of magnetized charged particles in parabolic and inverse electrostatic potentials

2016 ◽  
Vol 82 (1) ◽  
Author(s):  
P. M. Bellan
Keyword(s):  
Magnetic Field ◽  
Angular Momentum ◽  
Charged Particle ◽  
Penning Trap ◽  
Axial Magnetic Field ◽  
Charged Particles ◽  
Analytic Solutions ◽  
The Other ◽  
Particle Orbit ◽  
Slow Frequency

Analytic solutions are presented for the orbit of a charged particle in the combination of a uniform axial magnetic field and parabolic electrostatic potential. These trajectories are shown to correspond to the sum of two individually rotating vectors with one vector rotating at a constant fast frequency and the other rotating in the same sense but with a constant slow frequency. These solutions are related to Penning trap orbits and to stochastic orbits. If the lengths of the two rotating vectors are identical, the particle has zero canonical angular momentum in which case the particle orbit will traverse the origin. If the potential has an inverse dependence on distance from the source of the potential, the particle can impact the source. Axis-encircling orbits are where the length of the vector associated with the fast frequency is longer than the vector associated with the slow frequency. Non-axis-encircling orbits are the other way around.

scholarly journals CHARGED PARTICLES WITH SPIN IN A GRAVITATIONAL WAVE AND A UNIFORM MAGNETIC FIELD

2006 ◽  
Vol 15 (01) ◽  
pp. 121-130 ◽  
Author(s):  
MORTEZA MOHSENI
Keyword(s):  
Magnetic Field ◽  
Charged Particle ◽  
Gravitational Wave ◽  
Uniform Magnetic Field ◽  
Charged Particles ◽  
Space Time ◽  
Pp Wave

We study the motion of a pseudo-classical charged particle with spin in the space–time of a gravitational pp wave in the presence of a uniform magnetic field.

Critical Examination of a Proposed Charged-Particle Stern–Gerlach Experiment

1972 ◽  
Vol 50 (3) ◽  
pp. 185-195
Author(s):  
Thomas F. Knott
Keyword(s):  
Magnetic Field ◽  
Charged Particle ◽  
Phase Space ◽  
Initial Phase ◽  
Initial Conditions ◽  
Transverse Velocity ◽  
Charged Particles ◽  
Transverse Magnetic ◽  
Critical Examination ◽  
Focusing Effect

It has been proposed by Enga and Bloom that combined electric and magnetic helical quadrupole fields may be used to perform a Stern–Gerlach experiment on charged particles. A detailed investigation shows that the longitudinal Lorentz force due to coupling of the transverse velocity of the particles to the transverse magnetic field produces an additional focusing effect which masks the Stern–Gerlach force in large regions of initial phase space. Consideration of uncompensated magnetic fields, produced by small random variations in conductor dimensions and location, shows that the tolerances required to preserve spin separation in the useful range of initial conditions are several orders of magnitude higher than can be achieved at this time.

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)

On the generation of magnetic fields due to ponderomotive forces in astrophysical plasmas

2002 ◽  
Vol 67 (2-3) ◽  
pp. 129-138 ◽  
Author(s):  
A. ROY CHOWDHURY ◽  
M. KHURSHED ALAM ◽  
K. ROY CHOWDHURY ◽  
S. N. PAUL ◽  
B. A. BEGUM
Keyword(s):  
Magnetic Field ◽  
Growth Rate ◽  
Magnetic Fields ◽  
Electromagnetic Waves ◽  
Inhomogeneous Plasma ◽  
Astrophysical Plasma ◽  
Astrophysical Plasmas ◽  
Ponderomotive Forces ◽  
Collisional Interactions ◽  
The Magnetic Field

The generation of magnetic fields due to ponderomotive forces in astrophysical plasma consisting of electrons, ions and positrons is investigated theoretically. It is seen that collisional or non-collisional interactions (between electromagnetic waves and plasma particles) via ponderomotive forces in an inhomogeneous plasma can excite a magnetic field. The growth rate of the magnetic field is illustrated graphically for different values of the temperature and concentration of positrons in the plasma.

scholarly journals VLF emission triggering by a highly anisotropic energetic electron plasma

2003 ◽  
Vol 21 (2) ◽  
pp. 481-492 ◽  
Author(s):  
D. Nunn ◽  
A. Demekhov ◽  
V. Trakhtengerts ◽  
M. J. Rycroft
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Waves ◽  
Energetic Electron ◽  
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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