Refractive turbulence profiling using an orbiting light source

Abstract

The possibility of obtaining vertical profiles of refractive turbulence C' using an orbiting monochromatic light source is examined. The method employs spatial and temporal filtering of the observed scintillation pattern arising from density fluctuations in the atmosphere to measure C2. The impact of atmospheric motion on the method is discussed along with ways to mitigate its effect. Single and array receiver configurations are examined and the multiple response problem inherent in array configurations is corrected by tuning the individual array elements to the array response. The method is expected to be significantly better than the existing stellar scintillometer method.

A stability property of a force-free surface bounding a vacuum gap

“…An important feature of many models of pulsar magnetosphere is the presence of voids or gaps embedded in a charge-separated force-free plasma (Holloway 1973, Ruderman & Sutherland 1975, Rylov 1977, Michel 1979, Jackson 1980. Such a void exists in particular in the global axisymmetric model first proposed by Michel (1980) and later numerically computed by several groups (Krause-Polstorff & Michel 1985a, 1985b, Smith et al 2001, Pétri et al 2002, Spitkovsky & Arons 2002. In this latter picture, the void extends to infinity, the plasma occupying only a bounded region -the electrosphere -around the pulsar.…”

Lidar Measurement of Optical Turbulence: Theory of the Crossed Path Technique

“…The absolute value of the weighting function is shown in the vicinity of the 25 crossing altitude of 5 km for several values of aperture diameters. 6. The maximum value of the weighting function is shown versus the inner scale 27 10.…”