Properties of drift waves in a filamentary density depletion
This analytical and numerical study explores the properties of electrostatic, drift-wave eigenmodes trapped within a magnetic field-aligned depletion in plasma density and temperature whose transverse dimension is on the order of the electron skin depth. The dependence of the complex eigenfrequencies on key parameters is investigated for collisionless and collisional plasma. The collisional description is based on the Lorentz model of electron pitch-angle scattering. The separate roles of the gradients in density and temperature are illustrated for the collisional and collisionless regimes. The predictions are compared to experimental observations [J. E. Maggs and G. J. Morales, Geophys. Res. Lett. 23, 633 (1996); Phys. Plasmas 4, 290 (1997)] of a controlled striation in the laboratory.
This paper discusses some potential approaches to developing next-generation radar technologies via the development of ::: smart hardware subsystems that have the intrinsic capability to compensate for channel warping and propagation ::: distortions. Discussions with regard to typical categories of propagation distortions are provided along with a series of ::: sample scenarios that can provide challenging conditions for radar remote sensing applications. Observations of this set ::: of sample scenarios allows for the exploration of potential approaches to developing state-of-the art digital, RF, and ::: RF/Photonic technologies with intrinsic smart compensation capabilities that will enable the development of highresolution ::: radars that can operate at longer ranges while maintaining compact size and weight requirements.