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        <logical_identifier>urn:nasa:pds:voyager2_rss_uranus_49xr_raw:browse</logical_identifier>
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        <title>Voyager 2 Uranus Radio Occultation at Parkes -  Browse Data Collection</title>
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        <Citation_Information>
            <publication_year>2025</publication_year>
            <description>
                This collection contains quick-look plots from radio occultation
                data acquired during the Voyager 2 Uranus encounter at Parkes
                Observatory in Australia.  The data were collected at X-band 
                (3.6 cm wavelength) in right circular polarization.  Quick-look
                plots from calibration data are also included.
            </description>
        </Citation_Information>
        
        <Modification_History>
            
            <Modification_Detail>
                <modification_date>2025-04-12</modification_date>
                <version_id>1.0</version_id>
                <description>
                    Original collection of Voyager 2 Uranus radio occultation browse
                    data from Parkes Observatory.  JPEG plots were generated from original 
                    binary data, combined with an ASCII summary of observing conditions,
                    and assembled into a JPEG plot with four panels.  New PDS4 labels
                    were created.
                </description>
            </Modification_Detail>
            
        </Modification_History>
        
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    <Context_Area>
        
        <Time_Coordinates>
            <start_date_time>1986-01-22T18:00:06Z</start_date_time>
            <stop_date_time>1986-01-25T02:45:00Z</stop_date_time>
        </Time_Coordinates>
        
        <Primary_Result_Summary>
            <purpose>Science</purpose>
            <processing_level>Partially Processed</processing_level>
        </Primary_Result_Summary>
        
        <Investigation_Area>
            <name>Voyager</name>
            <type>Mission</type>
            <Internal_Reference>
                <lid_reference>urn:nasa:pds:context:investigation:mission.voyager</lid_reference>
                <reference_type>collection_to_investigation</reference_type>
            </Internal_Reference>
        </Investigation_Area>
        
        <Observing_System>
            
            <Observing_System_Component>
                <name>Voyager 2</name>
                <type>Host</type>
                <Internal_Reference>
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            </Observing_System_Component>

            <Observing_System_Component>
                <name>Deep Space Network</name>
                <type>Host</type>
                <Internal_Reference>
                    <lid_reference>urn:nasa:pds:context:facility:observatory.dsn</lid_reference> 
                    <reference_type>is_facility</reference_type>
                </Internal_Reference>
            </Observing_System_Component>
            
            <Observing_System_Component>
                <name>NASA Deep Space Network Radio Science</name>
                <type>Instrument</type>
                <Internal_Reference>
                    <lid_reference>urn:nasa:pds:context:instrument:dsn.rss</lid_reference> 
                    <reference_type>is_instrument</reference_type>
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            </Observing_System_Component>
            
            <Observing_System_Component>
                <name>Radio Science Subsystem</name>
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                    <reference_type>is_instrument</reference_type>
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            </Observing_System_Component>
            
            <Observing_System_Component>
                <name>Parkes 64-m Radio Telescope (as a DSN Antenna)</name>
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                <Internal_Reference>
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            </Observing_System_Component>
            
        </Observing_System>
        
        <Target_Identification>
            <name>Uranus</name>
            <type>Planet</type>
            <Internal_Reference>
                <lid_reference>urn:nasa:pds:context:target:planet.uranus</lid_reference>
                <reference_type>collection_to_target</reference_type>
            </Internal_Reference>
        </Target_Identification>
        
    </Context_Area>
    
    <Reference_List>
        <External_Reference>
            <reference_text>
                Eshleman, V. R., G. L. Tyler, J. D. Anderson, G. Fjeldbo, G. S. Levy, G. E. Wood,
                and T. A. Croft, Radio Science Investigations with Voyager, Space Science Reviews, 21,
                207-232, 1977.
            </reference_text>
            <description>
                The referenced product describes the planned Voyager radio science investigation.
                Data collection at Parkes Observatory was not part of the original plan.
            </description>
        </External_Reference>
        
        <External_Reference>
            <reference_text>
                Lindal, G. F.; Lyons, J. R.; Sweetnam, D. N.; Eshleman, V. R.; Hinson, D. P.; Tyler, G. L.
                The atmosphere of Uranus: results of radio occultation measurements with Voyager 2,
                Journal of Geophysical Research, 92, A13, 14987-15001, 1987.  doi: 10.1029/JA092iA13p14987
            </reference_text>
            <description>
                Results from the Voyager 2 ingress and egress radio occultations at Uranus.  Included are
                profiles in height of electron density in the ionosphere and gas refractivity, number
                density, pressure (0.3 mbars to 2.3 bars), temperature, and methane abundance in the
                troposphere and stratosphere.
            </description>
        </External_Reference>
        
        <External_Reference>
            <reference_text>
                Gresh, D. L.; Marouf, E. A.; Tyler, G. L.; Rosen, P. A.; Simpson, R. A. Voyager Radio 
                Occultation by Uranus' Rings.  1. Observational Results, Icarus, 78, pp. 131-168, 1989.
            </reference_text>
            <description>
                Uranus' nine previously known rings were observed by radio occultation with optical depth T
                as large as 6-8 at two azimuths separated by 145°.  Rings have rich structural detail that
                changes significantly with longitude.  28 of 36 ring edges are abrupt with gradients of at
                least 1 T/km.  There is little evidence for differential extinction between the 3.6 and 13
                cm wavelengths; but the five rings closest to Uranus differentially retard 13 cm phase more
                efficiently than the four outer rings.  An anomalous scattered signal was observed from 
                the outermost ring that is inconsistent with a Saturn-like scattering model.
            </description>
        </External_Reference>
        
    </Reference_List>

    <Collection>
        <collection_type>Browse</collection_type>
        <description>
            This collection contains quick-look plots from radio occultation data
            acquired during the Voyager 2 Uranus encounter at Parkes Observatory 
            (Australia).  The data were collected at X-band (3.6 cm wavelength) in
            right circular polarization.
        </description>
    </Collection>
    

    
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