Super Loki Dart meteorological rocket system Final report
Design and flight test data on Super Loki Dart sounding rocket system for obtaining high altitude wind profiles with low cost rocket vehicle and radar-reflective chaff payload
Bollermann, B.↗
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Results for “Radar Reflectivity”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Radar scatterometer data validation Final report
Radar scatterometer system to measure radar reflectivity or scattering cross sections of various surfaces as function of incidence angle
Craib, K. B.↗
Lunar surface electromagnetic properties
Radar reflectivity analysis and lunar magnetic materials studies based on Surveyor 7 data
Brown, W. E., Jr.↗
Surveyor V.
Surveyor 5 lunar probe spacecraft, discussing lunar surface mechanical properties, temperature and radar reflectivity
Jaffe, L. D.↗
Experimental theoretical evaluation of a passive communications satellite
Radar reflectivity of Echo 2 passive communications satellite
Kampinsky, A.↗
Surveyor 6 lunar mission.
Surveyor 6 lunar landing mission data on lunar topography, chemical composition, magnetic material content, radar reflectivity, density, bearing capacity, etc
Jaffe, L. D.↗
Preliminary correlations of radar and surface climatologies.
Correlation between radar reflectivity distributions and surface interference related to space communication
Altman, F. J.↗
A world-wide lunar radar time synchronization system
Synchronizing clocks at remote locations with master clock by radar reflected from moon for Deep Space Network
Baumgartner, W. S.↗
Radar observations of Icarus
Icarus radar and optical observations indicating surface smoothness differences between central and higher latitudes, radius size and radar reflectivity
Goldstein, R. M.↗
A world-wide lunar radar time synchronization system
Clock synchronization system using lunar radar reflections for Deep Space Network needs, discussing remote clock receiver and antenna
Baumgartner, W. S.↗
Simultaneous radar and instrumented aircraft observations in a clear air turbulent layer
CAT layer simultaneous radar and instrumented aircraft observations, noting eddy dissipation rate computation from radar reflectivity measurement
Kropfli, R. A.↗
Lightweight inflatable material with low permeability
Material features combination of Mylar, for strength, and Saran, for impermeable qualities. Second lamination of Mylar prevents blocking, adds strength, and increases barrier rating. Different combinations of laminations produce variety of thicknesses and barrier ratings. Material can be metallized for increased barrier reliability and radar reflectivity, and can be treated with a heat-resistant coating.
White, E. C.↗
Coordination procedure for radio relay and communication satellite services
A global rain rate statistic model is used to link microwave propagation statistics to measurable rain statistics in order to develop international telecommunication site criteria for radio relay and communication satellite services that minimize interference between receivers and transmitters. This rain coordination procedure utilizes a rain storm cell size, a statistical description of the rainfall rate within the cell valid for most of the earth's surface, approximations between Raleigh scatter and constancy of precipitation with altitude, and an analytic relation between radar reflectivity and rain rate.
Eckerman, J.↗
Venus - Radar determination of gravity potential.
We describe a method for the determination of the gravity potential of Venus from multiple-frequency radar measurements. The method is based on the strong frequency dependence of the absorption of radio waves in Venus' atmosphere. Comparison of the differing radar reflection intensities at several frequencies yields the height of the surface relative to a reference pressure contour; combination with measurements of round-trip echo delays allows the pressure, and hence the gravity potential contour, to be mapped relative to the mean planet radius. Since calibration data from other frequencies are unavailable, the absorption-sensitive Haystack Observatory data have been analyzed under the assumption of uniform surface reflectivity to yield a gravity equipotential contour for the equatorial region and a tentative upper bound of .0006 on the fractional difference of Venus' principal equatorial moments of inertia.
Shapiro, I. I.↗
On a possible method for daily adjustment of severe storm radar criteria
A method is proposed of adjusting the radar criteria for severe storms, taking into account the height of the minus 22 C isotherm, the minimum value of the maximum magnitude of the radar reflectivity in thunderstorms at the same level for a specific region, and the various types of homogeneous air masses in the air. Formulas for the criteria are presented which take into account specified errors of discrimination.
Brylev, G. B.↗
Mariner 10 infrared radiometer results - Temperatures and thermal properties of the surface of Mercury
Mariner 10 infrared brightness temperatures of the surface of Mercury at 11 and 45 microns are presented. The data were obtained during the first flyby along a near-equatorial swath extending from 17 hours local time through local midnight to 9 hours local time. For an assumed emissivity of 0.9, derived surface thermal inertias are between 0.0015 and 0.0031 cal/sq cm/sq root sec/K and the implied minimum predawn surface kinetic temperature for the warm pole at longitude 270 deg is near 93 K. Several pronounced thermal inhomogeneities were seen, one of which appears to coincide with a region of high radar reflectivity. The derived thermal properties, the electrical skin depth, and loss tangent fall within the range of values found on the moon.
Chase, S. C., Jr.↗
Sampling errors in the measurement of rain and hail parameters
Attention is given to a general derivation of the fractional standard deviation (FSD) of any integrated property X such that X(D) = cD to the n. This work extends that of Joss and Waldvogel (1969). The equation is applicable to measuring integrated properties of cloud, rain or hail populations (such as water content, precipitation rate, kinetic energy, or radar reflectivity) which are subject to statistical sampling errors due to the Poisson distributed fluctuations of particles sampled in each particle size interval and the weighted sum of the associated variances in proportion to their contribution to the integral parameter to be measured. Universal curves are presented which are applicable to the exponential size distribution permitting FSD estimation of any parameters from n = 0 to n = 6. The equations and curves also permit corrections for finite upper limits in the size spectrum and a realistic fall speed law.
Gertzman, H. S.↗
The rings of Saturn
Consideration is given to the development of theories concerning the rings of Saturn. Particular attention is given to ring structure, noting its thinness, the separations between rings, and observed variations in brightness. Data gathered via infrared, radio and radar techniques are described in terms of ring particle composition and size. Hypotheses about ring origin and evolution are outlined, including the tidal disruption model, calculations of Saturn's gravitational contraction history, grazing, and meteoroid bombardment. Prospects for future observations of Saturn's rings are reviewed, such as the variation in their radar reflectivity as a function of the tilt of the ring plane.
Pollack, J. B.↗