With Observations from the retarding ion mass spectrometer on the Dynamics Explorer I from 1981 through 1984, we examine the He() to H() density ratios as a function of altitude, latitude, season, local time, geomagnetic and solar activity. We find that the ratios are primarily a function of geocentric distance and the solar EUV input. The ratio of the densities, when plotted as a function of geocentric distance, decrease by an order of magnitude from 1 to 4.5 R(sub E). After the He() to H()...

Topics: BURGER EQUATION, ANALYSIS (MATHEMATICS), SPHERICAL COORDINATES, CYLINDRICAL BODIES, INCOMPRESSIBLE...

Previous results of plasmapause position surveys have been synthesized into a description of the underlying global distribution of plasmasphere-like or core plasma densities unique to a steady state magnetosphere. Under these steady conditions, the boundary between high- and low-density regions is taken to represent the boundary between diurnal near-corotation and large-scale circulation streamlines that traverse the entire magnetosphere. Results indicate a boundary that has a pronounced bulge...

Topics: VOLTAGE CONVERTERS (DC TO DC), MATHEMATICAL MODELS, DESIGN ANALYSIS, TRANSFER FUNCTIONS, SYSTEMS...

We present a ray-tracing study of the propagation of Pc 3 Alfven mode waves originating at the dayside magnetopause. This study reveals interesting features of magnetospheric filter effect for these waves. Pc 3 Alfven mode waves cannot penetrate to low Earth altitudes unless the wave frequency is below approximately 30 mHz. Configurations of the dispersion curves and the refractive index show that the gyroresonance and pseudo-cutoff introduced by the heavy ion O() block the waves. When the O()...

Topics: BURNING RATE, MORPHOLOGY, REACTION KINETICS, SURFACE REACTIONS, SURFACE TEMPERATURE, ARC LAMPS,...