Radiation from sources moving in a warm magnetoplasma. Final report

Technical Report · Thu Apr 10 04:00:00 EDT 1975

OSTI ID:7363158

Baker, D J

The power lost through radiation by an electric charge as it spirals in a homogeneous magnetoplasma is calculated. Coherent Cherenkov radiation from a group of charges is studied by assuming the charges radiate as a single macroscopic ellipsoid of revolution having a uniform volume charge density. The total power radiated by such a macroscopic source is shown to be finite even in those cases where the refractive index is unbounded. The power radiated by electric dipole and loop antennas oriented with their axes along the magnetic field of an anisotropic plasma and moving parallel to this field are given in the form of integrals which are easily evaluated numerically. Mathematical models of the plasma dielectric tensor are derived by using kinetic theory in addition to the so-called hydrodynamic and full adiabatic theories (Model H and A, respectively) with allowances made for the finite temperatures of both ions and electrons. Numerical results obtained using Models A and H are compared. For example, Model A predicts that in some cases a large fraction of the power radiated by a moving point charge source at frequencies near the upper hybrid resonance is in the form of thermal mode excitation. However, this 'high energy' thermal mode is missing from results obtained for the same source charge by using Model H. (GRA)

• Research Organization: Naval Research Lab., Washington, D.C. (USA)
• OSTI ID: 7363158
• Report Number(s): AD-A-010827; NRL-7871
• Country of Publication: United States
• Language: English

Related Subjects

640203* -- Atmospheric Physics-- Magnetospheric Phenomena-- (-1987)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BOLTZMANN EQUATION
CHERENKOV RADIATION
COHERENT RADIATION
DIFFERENTIAL EQUATIONS
EARTH ATMOSPHERE
ELECTRIC CHARGES
ELECTROMAGNETIC RADIATION
ELECTRON DENSITY
ENERGY LOSSES
EQUATIONS
MAGNETOSPHERE
MATHEMATICAL MODELS
MATHEMATICS
NUMERICAL ANALYSIS
PLASMA
POWER
RADIATIONS
TENSORS