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  • 1
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    A Lagrangian Simulation of Subsonic Aircraft Exhaust Emissions (1999)
    In:  Other Sources
    Details
    Publication Date: 2011-08-23
    Description: To estimate the effect of subsonic and supersonic aircraft exhaust on the stratospheric concentration of NO(y), we employ a trajectory model initialized with air parcels based on the standard release scenarios. The supersonic exhaust simulations are in good agreement with 2D and 3D model results and show a perturbation of about 1-2 ppbv of NO(y) in the stratosphere. The subsonic simulations show that subsonic emissions are almost entirely trapped below the 380 K potential temperature surface. Our subsonic results contradict results from most other models, which show exhaust products penetrating above 380 K, as summarized. The disagreement can likely be attributed to an excessive vertical diffusion in most models of the strong vertical gradient in NO(y) that forms at the boundary between the emission zone and the stratosphere above 380 K. Our results suggest that previous assessments of the impact of subsonic exhaust emission on the stratospheric region above 380 K should be considered to be an upper bound.
    Keywords: Environment Pollution
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  • 2
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    Mars radar observations - A preliminary report. (1971)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Radar observations of a narrow belt of the surface of Mars, centered at 16 deg south latitude, show a very rugged terrain, with elevation differences greater than 13 kilometers from peak to valley. For nearby points, the relative altitude is measured to 40 meters at best; the precision is worse for points at different latitudes, or widely separated in longitude, because of orbital uncertainties. Some of the larger craters have been resolved, and their depth and, in some cases, the height of the raised rim have been measured. Where high resolution photographs are available, the correlation is excellent.
    Keywords: SPACE SCIENCES
    Type: Science; 174; Dec. 24
    Format: text
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  • 3
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    JPL 2-to-the-20th-power channel 300 MHz bandwidth digital spectrum analyzer (1978)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: A million (two to the 20th power) channel, 300 MHz bandwidth, digital spectrum analyzer was considered. The design, fabrication, and maintenance philosophy of the modular, pipelined, fast fourier transform (FFT) hardware are described. The spectrum analyzer will be used to examine the region from 1.4 GHz to 26 GHz for radio frequency interference which may be harmful to present and future tracking missions of the Deep Space Network. The design has application to the search for extraterrestrial intelligence signals and radio science phenomena.
    Keywords: COMMUNICATIONS AND RADAR
    Type: The Deep Space Network; p 57-61
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  • 4
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    Average pulsar energies at centimetre wavelengths. (1969)
    In:  Other Sources
    Details
    Publication Date: 2011-08-12
    Description: Pulsars observed for average energies at centimeter wavelengths, using azimuth elevation antenna
    Keywords: SPACE SCIENCES
    Type: ; STITUTION OF ENGINEE
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  • 5
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    Time-of-arrival observations of eleven pulsars (1970)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Pulsars pulse arrival time measured using cesium clock during weekly observations
    Keywords: SPACE SCIENCES
    Type: ; UGREVUE(
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  • 6
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    Distribution and size of elements of Saturn's rings as inferred from 12-cm radar observations (1974)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: A 64m radar antenna was used to observe Saturn's rings at 12.6 cm wavelength, with reduced Doppler spread. The results show a positive radar return corresponding to about a 60 percent return from an isotropic scatterer with the projected area of the rings, allowing for the Cassini division. A radar spectrogram of the rings is shown with power density plotted against Doppler frequency shift.
    Keywords: ASTROPHYSICS
    Type: NASA, Washington The Rings of Saturn; p 73-82
    Format: application/pdf
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  • 7
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    Martian topography and surface properties as seen by radar - The 1971 opposition. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Taking advantage of the favorable opposition of 1971, the Goldstone radar system, operating at 2388 MHz, was used to scan the Martian surface. Measurements of altitude and reflected power were taken approximately every 3 days. Each measurement represents an area 8 km E-W by 80 km N-S, the highest resolution attained to date. Altitude measurements obtained on different observing days were combined to produce altitude profiles for three complete rotations, each at different latitudes. Large-scale variations in altitudes cover a range of 14 km. Altitude changes of 5 in 30 km of longitude were observed. The altitude profiles show the heavy cratering of the surface, and several large craters (50-100 km) 1-2 km deep are easily seen.
    Keywords: SPACE SCIENCES
    Type: Icarus; 18; Jan. 197
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  • 8
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    Ganymede - Observations by radar (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Radar cross-section measurements indicate that Ganymede scatters to earth 12 percent of the power expected from a conducting sphere of the same size and distance. This compares with 8 percent for Mars, 12 percent for Venus, 6 percent for Mercury, and about 8 percent for the asteroid Toro. Furthermore, Ganymede is considerably rougher (to the scale of the wavelength used, 12.6 centimeters) than Mars, Venus, or Mercury. Roughness is made evident in this experiment by the presence of echoes away from the center of the disk. A perfectly smooth target would reflect only a glint from the center, whereas a very rough target would reflect power from over the entire disk.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Science; 188; June 20
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  • 9
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    A radar brightness and altitude image of a portion of Venus (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: High-resolution radar data, taken from over the 1500-km circular area that was at the center of the planetary disk on June 20, 1972, show that this part of Venus is nearly flat and cratered. The largest crater is 160 km across, but only about 500 m deep. The smallest craters that can be resolved are about 35 km across.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Icarus; 23; Sept
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  • 10
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    Radar observations of the rings of Saturn (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Keywords: SPACE SCIENCES
    Type: Icarus; 20; Nov. 197
    Format: text
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