Accession Number : AD0703708

Title :   ATTENUATION AND EMISSION OF THE ATMOSPHERE AT 3.3 MM.

Descriptive Note : Rept. for Dec 63-Aug 69,

Corporate Author : AEROSPACE CORP EL SEGUNDO CALIF LAB OPERATIONS

Personal Author(s) : Shimabukuro,Fred I. ; Epstein,Eugene E.

Report Date : 31 DEC 1969

Pagination or Media Count : 30

Abstract : Four empirical relationships are presented between the 3.3-mm attenuation determined from observations of the sun and (1) radiosonde measurements of the total amount of precipitable water in the atmosphere, (2) surface measurements of absolute humidity, (3) IR spectral hygrometer observations of the sun, and (4) observations of differential atmospheric emission at 3.3 mm. Fluctuations in atmospheric emission at 3.3 mm during good weather do not put any limit on the sensitivity of a dual-beam observing system using a receiver whose rms noise fluctuations in an output noise bandwidth of 0.25 Hz are nearly equal to 0.5K. (Author)

Descriptors :   (*RADIO ASTRONOMY, UPPER ATMOSPHERE), (*IONOSPHERIC PROPAGATION, ATTENUATION), WATER VAPOR, HYGROMETERS, INFRARED EQUIPMENT, HUMIDITY, OXYGEN, ABSORPTION, SUN, MILLIMETER WAVES, VERY LOW FREQUENCY

Subject Categories : Astrophysics
      Atmospheric Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE