## Historical and technical survey |

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Page 35

(hi Jli -77 = -0.039 • 10"6 per meter (11) Refraction at the boundary of two media

is familiar from optics and is expressed by Snell's law: Hi cos a\ = «2 cos an (12)

where «i and nz are the

(hi Jli -77 = -0.039 • 10"6 per meter (11) Refraction at the boundary of two media

is familiar from optics and is expressed by Snell's law: Hi cos a\ = «2 cos an (12)

where «i and nz are the

**refractive indices**of the two media and ai and a2 the ...Page 194

1714 Refraction — Snell's Law The bending of rays in the atmosphere depends

upon the

moisture content of the air. The manner in which these quantities control the

index ...

1714 Refraction — Snell's Law The bending of rays in the atmosphere depends

upon the

**refractive index**n which is a function of the temperature, pressure, andmoisture content of the air. The manner in which these quantities control the

index ...

Page 197

It has been shown above that a linear variation of

converted into a change of earth's curvature. The reverse process is equally

feasible: to eliminate the earth's curvature by using a modified

curve. This is ...

It has been shown above that a linear variation of

**refractive index**can beconverted into a change of earth's curvature. The reverse process is equally

feasible: to eliminate the earth's curvature by using a modified

**refractive index**curve. This is ...

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altitude Anomalous Propagation antenna attenuation azimuth band characteristic values Committee on Propagation computed constant coverage diagram CUDWR curvature curve decibels decrease determine diffraction diffraction region direct distance Division 14 Report duct earth effect elevation equation equipment experiments factor field intensity field strength free space frequency Fresnel zones functions gradient ground height horizontal humidity index of refraction JEIA land layer lobe angles maximum measurements meter method microwave miles mode moisture NDRC nonstandard propagation NRSL obtained operational optical OSRD path difference pattern permanent echoes phase plane plotted polarization problem radar radar cross section Radio Propagation Radio Waves radius range receiver reflection coefficient refractive index region Research signal strength Snell's law standard atmosphere superrefraction target temperature inversion theory tion transmission transmitter trapping Tropospheric variation vertical Wave Propagation Wave Propagation Group wavelength weather X band zone