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  • 1
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    Ocean gravity and geoid determination (1979)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Gravity anomalies have been recovered in the North Atlantic and the Indian Ocean regions. Comparisons of 63 2 deg x 2 deg mean free air gravity anomalies recovered in the North Atlantic area and 24 5 deg x 5 deg mean free air gravity anomalies in the Indian Ocean area with surface gravimetric measurements have shown agreement to + or - 8 mGal for both solutions. Geoids derived from the altimeter solutions are consistent with altimetric sea surface height data to within the precision of the data, about + or - 2 m.
    Keywords: OCEANOGRAPHY
    Type: Journal of Geophysical Research; 84; July 30
    Format: text
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  • 2
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    Soil conservation applications with C-band SAR (1992)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Soil conservation programs are becoming more important as the growing human population exerts greater pressure on this non-renewable resource. Indeed, soil degradation affects approximately 10 percent of Canada's agricultural land with an estimated loss of 6,000 hectares of topsoil annually from Ontario farmland alone. Soil loss not only affects agricultural productivity but also decreases water quality and can lead to siltation problems. Thus, there is a growing demand for soil conservation programs and a need to develop an effective monitoring system. Topography and soil type information can easily be handled within a geographic information system (GIS). Information about vegetative cover type and surface roughness, which both experience considerable temporal change, can be obtained from remote sensing techniques. For further development of the technology to produce an operational soil conservation monitoring system, an experiment was conducted in Oxford County, Ontario which investigated the separability of fall surface cover type using C-band Synthetic Aperture Radar (SAR) data.
    Keywords: OCEANOGRAPHY
    Type: JPL, Summaries of the Third Annual JPL Airborne Geoscience Workshop. Volume 3: AIRSAR Workshop; p 86-88
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  • 3
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    Mean sea level determination from satellite altimetry (1979)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: The primary experiment on the Geodynamics Experimental Ocean Satellite-3 (GEOS-3) is the radar altimeter. This experiment's major objective is to demonstrate the utility of measuring the geometry of the ocean surface; i.e., the geoid. Results obtained from this experiment so far indicate that the planned objectives of measuring the topography of the ocean surface with an absolute accuracy of + or - 5 m can be met and perhaps exceeded. The GEOS-3 satellite altimeter measurements have an instrument precision in the range of + or - 25 cm to + or - 50 cm when the altimeter is operating in the 'short pulse' mode. After one year's operations of the altimeter, data from over 5000 altimeter passes have been collected. With the mathematical models developed and the altimeter data presently available, mapping of local areas of ocean topography has been realized to the planned accuracy levels and better. This paper presents the basic data processing methods employed and some interesting results achieved with the early data. Plots of mean sea surface heights as inferred by the altimeter measurements are compared with a detailed 1 by 1 deg gravimetric geoid.
    Keywords: OCEANOGRAPHY
    Type: Marine Geodesy; 2; 2, 19; 1979
    Format: text
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  • 4
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    Roughness of the marine geoid from Seasat altimetry (1983)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: The geographical variability of short wavelength geoid power spectra (geoid roughness) has been mapped for the world's oceans between latitudes 72 deg N and 72 deg S. A spectral analysis of Seasat altimeter data, reduced to sea surface heights, has been performed at 2-min intervals for 15 consecutive days of the 3-day repeat orbit. The geoid roughness represented by these spectra for wavelengths shorter than about 220 km is separated from the total sea height variance and is displayed in the form of a global contour map. The global average geoid roughness is 32 cm RMS, varying from a high in excess of 2 m RMS near deep ocean trenches to a low of 2 cm RMS in the southeast Pacific near the east Pacific rise. This average value agrees well with previous estimates based on gravimetry and GEOS 3 altimetry. In general, the smoothest areas in the marine geoid overlie relatively young sea floor adjacent mid-ocean spreading centers, where even short wavelength topographic variations tend to be isostatically compensated.
    Keywords: OCEANOGRAPHY
    Type: Journal of Geophysical Research; 88; Feb. 28
    Format: text
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  • 5
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    Coprostanol as a potential tracer of particulate sewage effluent to shelf waters adjacent to the Chesapeake Bay (1981)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Samples were collected in the Chesapeake Bay entrance and contiguous shelf waters and were subsequently analyzed for particulate coprostanol and cholesterol concentrations. Surface coprostanol concentrations were fairly uniform, with a slight increase with depth. This increase with depth may be due to sewage-associated particulates settling as they leave the Bay, or the resuspension of contaminated sediment. Preliminary findings indicate sewage-associated materials are being transported from the Chesapeake Bay to shelf waters, where they may have a detrimental affect on living marine resources.
    Keywords: OCEANOGRAPHY
    Type: NASA. Langley Research Center Chesapeake Bay Plume Study; p 243-250
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  • 6
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    Some developments in improved methods for the measurements of the spectral irradiances of solar simulators (1963)
    In:  CASI
    Details
    Publication Date: 2019-05-23
    Description: Measurement of spectral emission from solar simulators - photoelectric photometry
    Keywords: SPACE RADIATION
    Type: NASA-CR-201
    Format: application/pdf
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  • 7
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    Triton's global heat budget (1991)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Internal heat flow from radioactive decay in Triton's interior along with absorbed thermal energy from Neptune total 5 to 20 percent of the insolation absorbed by Triton, thus comprising a significant fraction of Triton's surface energy balance. These additional energy inputs can raise Triton's surface temperature between approx. 0.5 to 1.5 K above that possible with absorbed sunlight alone, resulting in a factor of approx. 1.5 to 2.5 increase in Triton's basal atmospheric pressure. If Triton's internal heatflow is concentrated in some areas, as is likely, local effects such as enhanced sublimation with subsequent modification of albedo could be quite large. Furthermore, indications of recent albedo change on Triton suggest that Triton's surface temperature and pressure may not now be in steady state, further suggesting that atmospheric pressure on Triton was as much as 10 times higher in the recent past.
    Keywords: SPACE RADIATION
    Type: NASA-CR-188178 , NAS 1.26:188178
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  • 8
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    Cosmic ray neutrino tests for heavier weak bosons and cosmic antimatter (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A program for using high energy neutrino astronomy with large neutrino detectors to directly test for the existence of heavier weak intermediate vector bosons (ivb) and cosmic antimatter is described. Such observations can provide a direct test of baryon symmetric cosmologies. Changes in the total cross section for nu(N) yields mu(X) due to additional propagators are discussed and higher mass resonances in the annihilation channel bar-nu sub e e(-) yields X are analyzed. The annihilation channel is instrumental in the search for antimatter, partcularly if heavier IVB's exist.
    Keywords: SPACE RADIATION
    Type: NASA-TM-83878 , NAS 1.15:83878
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  • 9
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    Auroral zone electron precipitation accompanying a sudden impulse in the geomagnetic field (1967)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Auroral zone electron precipitation accompanying sudden commencement of geomagnetic storms
    Keywords: SPACE RADIATION
    Type: NASA-CR-82982
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  • 10
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    Temporal and spectral features of an intense auroral zone X-ray event in the 4-5 second period range (1966)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Temporal and spectral features of intense auroral zone X-ray event in 4 to 5 second period range - electron precipitation
    Keywords: SPACE RADIATION
    Type: NASA-CR-82984
    Format: application/pdf
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