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  • Other Sources  (12)
  • 1
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    Pathfinder - Accuracy improvement of comet Halley trajectory for Giotto navigation (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The 'Pathfinder' project uses the resources of NASA, ESA and Intercosmos to support the Giotto space probe flyby of comet Halley. The required 500-km approach to comet Halley on the sunward side was so uncertain as to preclude the trajectory's realization with sufficient accuracy on the basis of ground-based astronomical observations alone. Spaceborne observations by the two Vega satellites were accordingly conducted; these, in combination with a very accurate determination of the Vega trajectories using VLBI, allowed a flyby distance of 600 km to be achieved with only + or - 40 km uncertainty.
    Keywords: SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
    Type: Nature (ISSN 0028-0836); 321; 318-320
    Format: text
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  • 2
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    The circulation of Prince William Sound (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: There are no author-identified significant results in this report.
    Keywords: GEOPHYSICS
    Type: E74-10119 , NASA-CR-136132 , BMPR-8
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Circulation of Prince William Sound (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: There are no author-identified significant results in this report.
    Keywords: GEOPHYSICS
    Type: E72-10132 , NASA-CR-128186 , BMPR-1
    Format: application/pdf
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  • 4
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    The circulation of Prince William Sound (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: There are no author-identified significant results in this report.
    Keywords: GEOPHYSICS
    Type: E74-10293 , NASA-CR-136680 , BMPR-9
    Format: application/pdf
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  • 5
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    The circulation of Prince William Sound (1974)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: There are no author-identified significant results in this report.
    Keywords: GEOPHYSICS
    Type: E74-10575 , NASA-CR-138680
    Format: application/pdf
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  • 6
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    The circulation of Prince William Sound (1973)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The author has identified the following significant results. Results suggest that sediment-laden plumes of fresh water from rivers may be useful tracers, due to their high visibility, of surface water motion. The two useable images obtained to date corroborate that westerly flow was occurring in the Gulf of Alaska just south of Prince William Sound, and that an inflow into Prince William Sound was occurring concurrently with flood tides on both occasions. River plumes are useful tracers, but poor weather conditions somewhat limit the use of satellite imagery.
    Keywords: GEOPHYSICS
    Type: E73-10291 , NASA-CR-130574
    Format: application/pdf
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  • 7
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    Circulation of Prince William Sound (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: There are no author-identified significant results in this report.
    Keywords: GEOPHYSICS
    Type: E73-10402 , NASA-CR-131138 , BMPR-4
    Format: application/pdf
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  • 8
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    Circulation of Prince William Sound (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The author has identified the following significant results. Visual examination of the available ERTS-1 and NASA NP-3 aircraft imagery has suggested that sediment-laden plumes from rivers may be useful in tracking surface circulation over the regions where these plumes retain their visible identities. Plumes of ice derived from tidewater glaciers are highly visible on the ERTS-1 imagery, but are generally of too small an areal extent to be useful in tracing surface circulation. Shore-fast ice is also highly visible on the ERTS-1 data. Practical scientific results include a corroboration of the westward flow just offshore in the Gulf of Alaska with inflow through Hinchinbrook Entrance into Prince William Sound. The tracer in this case was the Copper River Plume, which originates at the mouth of the Copper River east of Prince William Sound. A single partial image of Port Valdez, in northeastern Prince William Sound, suggests by the visible suspended sediment distribution that surface circulation there was cyclonic, as deduced previously from oceanographic baseline data. Surf along the shoreline of the Gulf of Alaska is highly visible on ERTS-1 imagery.
    Keywords: GEOPHYSICS
    Type: E72-10348 , NASA-CR-129662 , BMPR-2
    Format: application/pdf
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  • 9
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    Circulation of Prince William Sound (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: There are no author-identified significant results in this report.
    Keywords: GEOPHYSICS
    Type: E73-11064 , NASA-CR-135520 , BMPR-7
    Format: application/pdf
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  • 10
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    Circulation of Prince William Sound (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: There are no author-identified significant results in this report.
    Keywords: GEOPHYSICS
    Type: E73-10617 , NASA-CR-132028 , BMPR-5
    Format: application/pdf
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