Rotation Part of the Dielectric Permittivity of Water Vapor for Different Spectral Line Profiles

We estimate the possible influence of spectral line profile (Lorentz profile, Van Vleck–Weisskopf profile, and profile obtained by solving kinetic equation) on the rotation part of the dielectric permittivity of water-vapor monomers. Spectral regions corresponding to long-wavelength (static) and high-frequency (optical) limiting cases as well as regions in close proximity to resonances of various intensities are considered. The studied effects are compared with the corresponding effects on water-vapor absorption coefficient, which are related to factors determining the line-shape structure.     

Attenuation and phase variation of millimeter and centimeter radio waves in a medium consisting of dry and wet dust particles

The attenuating and refracting properties of wet dust particles with sand and loam nuclei at wavelengths of about 0.1–10 cm are considered. Quantitative characteristics of radio-wave attenuation obtained for various models of homogeneous particles with effective permittivity are compared with an exact solution of the electrodynamic problem for two-layer particles (sphere in envelope). Radio-wave phase variations caused by the presence of dust formations in the medium are determined.Scientific-Research Radio-Physics Institute. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 37, No. 11, pp. 1412–1427, November, 1994.     

Physical aspects of the model of propagation of centimeter and millimeter radio waves along inclined paths in the earth’s atmosphere

We present the physical aspects of constructing a computer model of propagation of centimeter and millimeter radio waves along inclined paths in the earth’s atmosphere, which allows us to calculate the integral attenuation in the frequency spectrum from 3 to 100 GHz, the time of group delay of the signal, refraction of radio waves, and the brightness temperature of the atmosphere for certain regions on the basis of standard atmospheric models and optimal statistical extrapolation of surface meteorological elements. The results of this paper were presented in part at the XVIIIth All-Russia Conference on Propagation of Radio Waves (St. Petersburg, September 17–19, 1996 [1] Radiophysical Research institute, Nizhny Novgorod, Russia. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 40, No. 12, pp. 1463–1478, December, 1997.