Reply to comment by E. Comay on the longitudinal magnetic field of circularly polarized electromagnetic waves

1996 ◽  
Vol 9 (6) ◽  
pp. 587-593 ◽  
Author(s):  
M. W. Evans ◽  
S. Jeffers
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Waves ◽  
Longitudinal Magnetic Field ◽  
Circularly Polarized

Whistler instability in plasmas with anisotropic and non-Maxwellian velocity distributions

1971 ◽  
Vol 6 (3) ◽  
pp. 449-456 ◽  
Author(s):  
Kai Fong Lee
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Waves ◽  
Maxwell Equations ◽  
Transverse Velocity ◽  
Distribution Functions ◽  
Loss Cone ◽  
Circularly Polarized ◽  
Electron Plasmas ◽  
Thermal Spread ◽  
The Magnetic Field

The instability of right-handed, circularly polarized electromagnetic waves, propagating along an external magnetic field (whistler mode), is studied for electron plasmas with distribution functions peaked at some non-zero value of the transverse velocity. Based on the linearized Vlasov-Maxwell equations, the criteria for instability are given both for non-resonant instabilities arising from distribution functions with no thermal spread parallel to the magnetic field, and for resonant instabilities arising from distribution functions with Maxwellian dependence in the parallel velocities. It is found that, in general, the higher the average perpendicular energy, the more is the plasma susceptible to the whistler instability. These criteria are then applied to a sharply peaked ring distribution, and to loss-cone distributions of the Dory, Guest & Harris (1965) type.

Circularly polarized luminescence of achiral open-shell π-radicals

2019 ◽  
Vol 55 (46) ◽  
pp. 6583-6586 ◽  
Author(s):  
Qingxian Jin ◽  
Sanxu Chen ◽  
Yutao Sang ◽  
Haoqing Guo ◽  
Shengzhi Dong ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Liquid Crystals ◽  
Longitudinal Magnetic Field ◽  
Open Shell ◽  
Circularly Polarized ◽  
Circularly Polarized Luminescence ◽  
Polarized Luminescence ◽  
Chiral Liquid Crystals

Doublet emission-based circularly polarized luminescence was successfully realized in luminescent π-radicals by applying three kinds of approaches, namely, induction by a longitudinal magnetic field, supramolecular chiral co-assembly, and doping into chiral liquid crystals.

Generation of whistler-mode signals in the presence of enhanced fluctuations in plasmas

1980 ◽  
Vol 23 (3) ◽  
pp. 483-494 ◽  
Author(s):  
M. Nambu ◽  
S. Bujarbarua ◽  
P. K. Shukla ◽  
K. H. Spatschek
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Electrostatic Field ◽  
Electromagnetic Waves ◽  
Space Plasmas ◽  
Whistler Waves ◽  
Whistler Mode ◽  
Circularly Polarized ◽  
Guide Magnetic Field

Acceleration of an electron by the electrostatic field of ion wave fluctuations is considered including the external magnetic field. It is found that an accelerated electron can emit unstable electromagnetic waves which propagate along the guide magnetic field. As an example, we discuss the generation of right-handed circularly polarized whistler waves. Application of our result to laboratory and space plasmas is examined.

Scattering of circularly polarized electromagnetic waves off a straight electron beam propagating along a constant magnetic field

1991 ◽  
Vol 46 (2) ◽  
pp. 201-207
Author(s):  
Alexander Bogdanov
Keyword(s):  
Magnetic Field ◽  
Nonlinear Dynamics ◽  
Electron Beam ◽  
Electromagnetic Waves ◽  
Electron Beams ◽  
The Other ◽  
Free Electron Lasers ◽  
Circularly Polarized ◽  
Beam Density ◽  
The Stability

The stability of straight field-aligned electron beams, immersed in an external magnetic field of finite magnitude, with respect to the excitation in them of circularly polarized (spiral) electromagnetic waves is a problem calling for detailed investigation, particularly in the context of the study and development of free-electron lasers. Traditionally the problem is treated using the theory of electromagnetic waves scattering off electron-beam density oscillations. This is done, however, without considering the inverse influence of the beam on the dispersion properties of the electromagnetic waves. On the other hand, it is well known that the presence of the beam introduces substantial changes in the characteristics of the electromagnetic waves interacting with the beam, and, moreover, this results in the appearance of radically new types of waves that are entirely absent in free space. The paper is dedicated to the study of the nonlinear dynamics of the interaction of such radically changed electromagnetic waves with the beam density oscillations.

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