Accession Number : ADA184681

Title :   Millimeter-Wave Studies of Moist Air.

Descriptive Note : Final rept. Oct 84-Mar 87,

Corporate Author : NATIONAL TELECOMMUNICATIONS AND INFORMATION ADMINISTRATION BOULDER CO

Personal Author(s) : Liebe,Hans J

PDF Url : ADA184681

Report Date : 01 Jun 1987

Pagination or Media Count : 84

Abstract : The near-millimeter region of the spectrum (NMMW: 0.1-1 THz) is an active area for research. Possible applications lie in short-range communications, radar, radiometry, and radio astronomy. Atmospheric effects of transmission and emission dominate performance simulations and the complex refractivity N provides a measure of the interactions between radiation and the atmospheric propagation medium. A reliable N-model allows calculation of frequency-dependent rates for delay (real part) and attenuation (imaginary part) based on measurable meteorological variables. Dry air and atmospheric water vapor are major millimeter-wave absorbers; so are suspended droplets (haze, fog, cloud) and precipitation water drops that emanate from the vapor phase. Laboratory research and analytical studies have been conducted with the primary purpose of understanding NMMW attenuation and delay rates.

Descriptors :   *AIR, *RADIATION ATTENUATION, *DELAY, *WATER VAPOR, *MOLECULAR SPECTROSCOPY, RESONANCE RADIATION, OXYGEN, NITROGEN, ARGON, PRESSURE, TEMPERATURE

Subject Categories : Atmospheric Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE