Accession Number : AD0612131

Title :   RADIO ASTRONOMY AT MILLIMETER WAVELENGTH.

Descriptive Note : Final rept. for 16 Apr 59-30 Apr 62,

Corporate Author : COLUMBIA RADIATION LAB NEW YORK

Report Date : 30 APR 1962

Pagination or Media Count : 16

Abstract : MILLIMETER-BAND RADIOTELESCOPE: A complete M-band radiotelescope was built for application of techniques of millimeter-band radioastronomy to studies of (1) behavior of oxygen in the earth's high atmosphere and (2) the precise frequency of the coronal radiation due to the hfs transition of sextuply ionized atomic nitrogen. The radiotelescope had an equatorial mount capable of steering a 180-lb, 5-ft parabolic antenna with a millimeterband Dicke radiometer. The temperature of the high atmosphere to which the peak of the oxygen line is sensitive varied enough on different days to produce changes of oxygen absorption. Calculations also showed that if the temperature of the atmosphere were 260 degrees K up to a height of 30 km and 240 K above 30 km, the nu(27)line would not be detectable by the radiotelescope used at that time. MILLIMETER-WAVE MASER: A millimeterwavelength maser oscillator was constructed by using iron (3+) in rutile. The structure of the lowest energy levels of iron (3+) in rutile was accurately determined, and the spin-lattice relaxation times and line width of some of the transitions were determined accurately.

Descriptors :   (*RADIO ASTRONOMY, MILLIMETER WAVES), (*MILLIMETER WAVES, RADIO ASTRONOMY), (*MASERS, OSCILLATORS), (*OSCILLATORS, MASERS), ATMOSPHERES, OXYGEN, NITROGEN, SOLAR RADIATION, TEMPERATURE, SPECTROSCOPY, IRON, IONS, ABSORPTION, ATOMIC ENERGY LEVELS, RELAXATION TIME, PARABOLIC ANTENNAS, RADIOMETERS, ELECTRON TRANSITIONS

Distribution Statement : APPROVED FOR PUBLIC RELEASE