Effect of time-dependent 3-D electron density gradients on high angle of incidence HF radiowave propagation

Radio Science ◽  
2016 ◽  
Vol 51 (7) ◽  
pp. 1131-1141 ◽  
Author(s):  
K. A. Zawdie ◽  
D. P. Drob ◽  
J. D. Huba ◽  
C. Coker
Keyword(s):  
Electron Density ◽  
Time Dependent ◽  
Radiowave Propagation ◽  
Density Gradients ◽  
Angle Of Incidence ◽  
High Angle

High-angle Kikuchi patterns

1954 ◽  
Vol 221 (1145) ◽  
pp. 224-242 ◽  
Keyword(s):  
Lithium Fluoride ◽  
High Efficiency ◽  
Cylindrical Specimen ◽  
Angle Of Incidence ◽  
High Angle ◽  
Lead Sulphide ◽  
Marked Contrast ◽  
Experimental Conditions ◽  
Low Intensity ◽  
Glancing Angle

A cylindrical specimen chamber and camera have been used to study the high-angle Kikuchi patterns obtained by reflexion of electrons, of energy 6 to 50 keV, from the cleavage surfaces of crystals with the sodium chloride structure. Angles of scattering ranging from 0 to 164° were covered. The relative intensity of the pattern at different scattering angles was measured using a photographic technique. The intensity distribution was found to become less steep as the energy of the incident electrons decreased. In photographs taken with a large value of the glancing angle of incidence, defect bands were found, starting near the shadow edge of the pattern; these changed to excess bands at higher angles of scattering. The most striking feature of the results is the remarkable intensity and clarity at the highest scattering angles of the pattern produced by crystals such as lead sulphide and potassium iodide, the constituents of which have a relatively high elastic scattering cross-section. In marked contrast, a relatively low intensity and low clarity was found at these angles for lithium fluoride under the same experimental conditions. An investigation of the width of Kikuchi bands, visible over the whole available angular range, showed that the electrons forming these bands had the same energy as that of the incident electrons within the experimental error of 10%. A possible mechanism is discussed by means of which electrons can be diffused through large angles with high efficiency, relative to small angles, and with relatively little loss of energy.

scholarly journals Study of the Propagation Characteristics of Terahertz Waves in a Collisional and Inhomogeneous Dusty Plasma with a Ceramic Substrate and Oblique Angle of Incidence

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Qingwen Rao ◽  
Guanjun Xu ◽  
Pengfei Wang ◽  
Zhengqi Zheng
Keyword(s):  
Electron Density ◽  
Dusty Plasma ◽  
Collision Frequency ◽  
Incident Angle ◽  
Ceramic Substrate ◽  
Dust Particles ◽  
Angle Of Incidence ◽  
Oblique Angle ◽  
Terahertz Waves ◽  
Thz Wave

In this paper, the propagation properties of a terahertz (THz) wave in a collisional and inhomogeneous dusty plasma with a ceramic substrate and oblique angle of incidence are studied using the scattering matrix method. The influence of the various corresponding parameters, such as the frequency of the THz wave, angle of incidence, electron density, radius and density of the dust particles, and the collision frequency, on the absorbance and transmittance is calculated. The results of the simulation indicate that an increase in the wave frequency increases the transmittance and decreases the absorbance. Moreover, the absorbance of a THz wave in a dusty plasma with a ceramic substrate increases with an increase in the incident angle, maximum electron density, coefficient of steepness, density and radius of the dust particles, and collision frequency. These results provide an important theoretical basis for the problem of communication blackout between ground and spacecraft.

scholarly journals The potential of Pléiades images with high angle of incidence for reconstructing the coastal cliff face in Normandy (France)

2020 ◽  
Vol 84 ◽  
pp. 101976 ◽  
Author(s):  
Pauline Letortu ◽  
Marion Jaud ◽  
Claire Théry ◽  
Jean Nabucet ◽  
Roza Taouki ◽  
...  
Keyword(s):  
Angle Of Incidence ◽  
High Angle ◽  
Coastal Cliff

scholarly journals On the role of vertical electron density gradients in the generation of type II irregularities associated with blanketing ES(ESb) during counter equatorial electrojet events: A case study

Radio Science ◽  
2004 ◽  
Vol 39 (3) ◽  
pp. n/a-n/a ◽  
Author(s):  
C. V. Devasia ◽  
N. Jyoti ◽  
K. S. V. Subbarao ◽  
Diwakar Tiwari ◽  
C. Raghava Reddi ◽  
...  
Keyword(s):  
Electron Density ◽  
Equatorial Electrojet ◽  
Density Gradients ◽  
Type Ii
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