PLASMA-VEHICLE INTERACTION IN A PLASMA STREAM
Possible interaction between a vehicle bearing an electrical propulsion device and the resident plasma in space
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Possible interaction between a vehicle bearing an electrical propulsion device and the resident plasma in space
Geomagnetic perturbations due to the solar wind are measured by the moment method for problem of a magnetic dipole in a cold, field-free plasma wind
Use of laser light to study the light scattering of a nonequilibrium helium plasma
Radiation belt deformation due to electrostatic field produced by ionospheric winds
Electron-electron collision contribution to bremsstrahlung emission from plasma
Enhanced bremsstrahlung from thermal plasmas containing nonthermal electrons
New inner-shell resonance lines in highly ionized sulfur and chlorine from high-energy theta-pinch plasma light source
Models that treat events associated with quasi-stellar objects as plasma phenomena
Approximate mode decomposition for treating boundary value problems for uniform compressible anisotropic plasma
High temperature air plasma total radiant intensity measurements in shock tube
Propagation and radiation of waves excited by electric dipole in dispersionless uniaxial moving medium
Electrical properties of Xe-filled thermionic diodes in nuclear reactor core radiation, obtaining I-V curves in radiation induced plasma between electrodes
H-He partially ionized plasma bremsstrahlung, radiative and dielectronic recombination, discrete levels excitation and collisional ionization
E and F region positive ion composition, electron concentration and thermal balance vertical profile, discussing ionizing radiation spectrum, plasma cooling, primary chemical reaction rates and ionospheric formation
The optical radiation from plasma discharges of electron-bombardment mercury-ion thrusters was investigated. Spectrographic measurements indicated that the discharge was composed primarily of mercury atoms and singly charged ions. Excitation spectra of doubly charged mercury ions was measured to obtain the fraction of such ions in the discharge. Accomplishments of spectroscopic measurements of a hollow cathode thruster included the identification of two diagnostic lines in the mercury spectrum and the interpretation of the spectral amplitudes in terms of a superposition of primary and Maxwellian electron distributions. Potential application of optical techniques to thruster control applications was also suggested by the measurements.
Characteristic times for the heating and cooling of thermal plasma in X-ray flares are estimated from the time profile of the flare and from the temperature, emission measure and length scale of the flare-heated plasma. It is implied from the empirical values for the characteristic times that flares are produced by magnetic field reconnection; that conductive cooling of the plasma dominates radiative cooling; and that reconnection heating and conductive cooling are approximately in balance at thermal X-ray maximum.
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The spectrum of radiation emitted by a hot optically thin plasma with abundances and equilibrium ionization balance appropriate to interstellar conditions has been calculated. The results at wavelengths shorter than 200 A are discussed for material in the electron-temperature range from 160,000 to 100 million K.