- 업종: Education
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A member of the University of Texas System, UT Dallas is a public research university with 125 academic programs offered through its seven schools. Many of the university's strongest and most popular programs are in business, the sciences, and applied sciences. UTD's admissions standards are among ...
Characteristic parameters which do not change as a physical system slowly evolves; the most commonly used one in plasma physics is the magnetic moment of a charged particle spiraling around a magnetic field line.
Industry:Physics
Diffusion process in which buildup of spatial charge creates electric fields which cause electrons and ions to leave the plasma at the same rate. Such electric fields are self-generated by the plasma and act to preserve charge neutrality.
Industry:Physics
The Atmospheric Explorer series were three similar spacecraft which orbited the Earth from 1973 to 1981. AE-C was launched by Delta on Dec. 16, 1973 in a highly elliptical orbit of 160 km to 4300 km altitude, with an inclination of 68 degrees. After about a year its orbit was circularized and maintained within 200km to 400km throughout the rest of its lifetime. AE-C returned to Earth on Dec. 11, 1978. The ill-fated AE-D was usable from Oct. 6, 1975 until Jan. 29, 1976. AE-E lasted from Nov. 19, 1975 to June 10, 1981, with an altitude profile similar to AE-C, but at 19 degrees inclination. The three spacecraft were instrumented primarily for the analysis of the Earth's atmosphere and particles and fields in the magnetosphere.
Industry:Physics
Energy propagated through space or through material media in the form of an advancing disturbance in electric and magnetic fields existing in space or in media. The term radiation, alone, is used commonly for this type of energy, although it actually has a broader meaning. The term is used for electromagnetic waves and wave radiation.
Industry:Physics
For a charged particle moving transversely in a uniform magnetic field, the radius of curvature of the projection of its path on a plane perpendicular to the field.
Industry:Physics
High latitude winter phenomena which occurs when the plasma remains for a long time on flux tubes with no sunlight and no particle precipitation. Even a slow decay rate is sufficient to deplete the plasma density.
Industry:Physics
The boundary layers of charged particles between plasmas and their surrounding walls, electrodes, or other plasmas. Envelopes of ionized gases that surround bodies moving through an atmosphere at hypersonic velocities.
Industry:Physics
A measure of the specific rate at which oppositely charged ions join to form neutral particles (a measure of ion recombination).
Industry:Physics
Pockets of very low electron density in the equatorial F region of the ionosphere in which the plasma density is lower than the ambient density.
Industry:Physics
Electrically conductive gases comprised of neutral particles, ionized particles, and free electrons but which, taken as a whole, are electrically neutral. Plasmas are further characterized by relatively large intermolecular distances, large amounts of energy stored in the internal energy levels of the particles, and the presence of plasma sheaths at all boundaries of the plasma. Plasmas are sometimes referred to as a fourth state of matter. Used for electrostatic plasma, ionized plasma, magnetoionic plasma, magnetoplasmas, and plasmoids.
Industry:Physics
