<?xml version="1.0" encoding="UTF-8"?>
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    <Identification_Area>
        <logical_identifier>urn:nasa:pds:voroelden:data_derived:voroelden_1_289_a</logical_identifier>
        <version_id>1.0</version_id>
        <title>Viking Orbiters 1 and 2 Radio Occultation Electron Density Derived Data</title>
        <information_model_version>1.8.0.0</information_model_version>
        <product_class>Product_Observational</product_class>
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        <Time_Coordinates>
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            <stop_date_time>1977-04-04T15:47:57.000Z</stop_date_time>
        </Time_Coordinates>
        <Primary_Result_Summary>
            <purpose>Science</purpose>
            <processing_level>Derived</processing_level>
      		<Science_Facets>
                <domain>Atmosphere</domain>
                <discipline_name>Atmospheres</discipline_name>
      		    <facet1>Structure</facet1>
      		</Science_Facets>
        </Primary_Result_Summary>
        <Investigation_Area>
            <name>Viking Orbiters 1 and 2</name>
            <type>Mission</type>
            <Internal_Reference>
                <lid_reference>urn:nasa:pds:context:investigation:mission.viking</lid_reference>
                <reference_type>data_to_investigation</reference_type>
            </Internal_Reference>
        </Investigation_Area>
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            <name>Viking Orbiters 1 and 2</name>
            <Observing_System_Component>
                <name>Viking Orbiter 1</name>
                <type>Spacecraft</type>
                <Internal_Reference>
                    <lid_reference>urn:nasa:pds:context:instrument_host:spacecraft.vo1</lid_reference>
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            </Observing_System_Component>
            <Observing_System_Component>
                <name>Viking Orbiter 2</name>
                <type>Spacecraft</type>
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                    <lid_reference>urn:nasa:pds:context:instrument_host:spacecraft.vo2</lid_reference>
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                </Internal_Reference>
            </Observing_System_Component>
            <Observing_System_Component>
                <name>Radio Science Subsystem</name>
                <type>Instrument</type>
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            <Observing_System_Component>
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                    <reference_type>is_instrument</reference_type>
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        </Observing_System>
    </Observation_Area>
    <Reference_List>
        <Internal_Reference>
            <lid_reference>urn:nasa:pds:voroelden:document:userguide</lid_reference>
            <reference_type>data_to_document</reference_type>
        </Internal_Reference>
    </Reference_List>
    <File_Area_Observational>
        <File>
            <file_name>voroelden_1_289_a_v01_r00.tab</file_name>
            <local_identifier>voroelden_1_289_a_file</local_identifier>
            <creation_date_time>2020-02-07T16:11:41.000Z</creation_date_time>
            <file_size unit="byte">2508</file_size>
        </File>
        <Table_Character>
            <name>Viking Orbiters 1 and 2 Occultation Header Table</name>
            <local_identifier>voroelden_1_289_a_header_table</local_identifier>
            <offset unit="byte">0</offset>
            <records>1</records>
            <description>A one record table with observing conditions for this observation</description>
            <record_delimiter>Carriage-Return Line-Feed</record_delimiter>
            <Record_Character>
                <fields>12</fields>
                <groups>0</groups>
                <record_length unit="byte">158</record_length>
                <Field_Character>
                    <name>OCC_TIME_SPICE</name>
                    <field_number>1</field_number>
                    <field_location unit="byte">1</field_location>
                    <data_type>ASCII_Date_Time_YMD</data_type>
                    <field_length unit="byte">24</field_length>
                    <unit>Dimensionless</unit>
                    <description>
                    UTC at Mars at time of occultation, as found from SPICE
                    </description>
                </Field_Character>
                <Field_Character>
                    <name>SCT_ID_BREUS</name>
                    <field_number>2</field_number>
                    <field_location unit="byte">25</field_location>
                    <data_type>ASCII_Integer</data_type>
                    <field_length unit="byte">12</field_length>
                    <unit>Dimensionless</unit>
                    <description>
                    Identifier of spacecraft: "1" for Viking Orbiter 1, "2" for Viking Orbiter 2, as provided by Breus
                    </description>
                </Field_Character>
                <Field_Character>
                    <name>ORBIT_NUMBER_BREUS</name>
                    <field_number>3</field_number>
                    <field_location unit="byte">37</field_location>
                    <data_type>ASCII_Integer</data_type>
                    <field_length unit="byte">12</field_length>
                    <unit>Dimensionless</unit>
                    <description>
                    Orbit number for relevant spacecraft at time of occultation, as provided by Breus
                    </description>
                </Field_Character>
                <Field_Character>
                    <name>SZA_BREUS</name>
                    <field_number>4</field_number>
                    <field_location unit="byte">49</field_location>
                    <data_type>ASCII_Real</data_type>
                    <field_length unit="byte">12</field_length>
                    <unit>Degree</unit>
                    <description>
                    Solar zenith angle at time and place of occultation, as provided by Breus
                    </description>
                </Field_Character>
                <Field_Character>
                    <name>SZA_SPICE</name>
                    <field_number>5</field_number>
                    <field_location unit="byte">61</field_location>
                    <data_type>ASCII_Real</data_type>
                    <field_length unit="byte">12</field_length>
                    <unit>Degree</unit>
                    <description>
                    Solar zenith angle at time and place of occultation, as found from SPICE
                    </description>
                </Field_Character>
                <Field_Character>
                    <name>LAT_SPICE</name>
                    <field_number>6</field_number>
                    <field_location unit="byte">73</field_location>
                    <data_type>ASCII_Real</data_type>
                    <field_length unit="byte">12</field_length>
                    <unit>Degree</unit>
                    <description>
                    Areocentric north latitude at time and place of occultation, as found from SPICE
                    </description>
                </Field_Character>
                <Field_Character>
                    <name>LON_SPICE</name>
                    <field_number>7</field_number>
                    <field_location unit="byte">85</field_location>
                    <data_type>ASCII_Real</data_type>
                    <field_length unit="byte">12</field_length>
                    <unit>Degree</unit>
                    <description>
                    Areocentric east longitude at time and place of occultation, as found from SPICE
                    </description>
                </Field_Character>
                <Field_Character>
                    <name>LST_SPICE</name>
                    <field_number>8</field_number>
                    <field_location unit="byte">97</field_location>
                    <data_type>ASCII_Real</data_type>
                    <field_length unit="byte">12</field_length>
                    <unit>Hour</unit>
                    <description>
                    Local solar time at time and place of occultation, as found from SPICE
                    </description>
                </Field_Character>
                <Field_Character>
                    <name>LS_SPICE</name>
                    <field_number>9</field_number>
                    <field_location unit="byte">109</field_location>
                    <data_type>ASCII_Real</data_type>
                    <field_length unit="byte">12</field_length>
                    <unit>Degree</unit>
                    <description>
                    Areocentric east longitude of the Sun (Ls) at time and place of occultation, as found from SPICE
                    </description>
                </Field_Character>
                <Field_Character>
                    <name>RREF_61MBAR</name>
                    <field_number>10</field_number>
                    <field_location unit="byte">121</field_location>
                    <data_type>ASCII_Real</data_type>
                    <field_length unit="byte">12</field_length>
                    <unit>Km</unit>
                    <description>
                    Radial distance to 6.1 mbar equipotential surface at place of occultation
                    </description>
                </Field_Character>
                <Field_Character>
                    <name>RREF_MOLA</name>
                    <field_number>11</field_number>
                    <field_location unit="byte">133</field_location>
                    <data_type>ASCII_Real</data_type>
                    <field_length unit="byte">12</field_length>
                    <unit>Km</unit>
                    <description>
                    Radial distance to MOLA equipotential surface at place of occultation
                    </description>
                </Field_Character>
                <Field_Character>
                    <name>F107_BREUS</name>
                    <field_number>12</field_number>
                    <field_location unit="byte">145</field_location>
                    <data_type>ASCII_Real</data_type>
                    <field_length unit="byte">12</field_length>
                    <unit>Dimensionless</unit>
                    <description>
                    Value of F10.7 solar irradiance proxy at Earth at time of occultation, as provided by Breus
                    </description>
                </Field_Character>
            </Record_Character>
        </Table_Character>
        <Table_Character>
            <name>Viking Orbiters 1 and 2 Occultation Electron Density Table</name>
            <local_identifier>voroelden_1_289_a_density_table</local_identifier>
            <offset unit="byte">158</offset>
            <records>47</records>
            <description>Electron density profile</description>
            <record_delimiter>Carriage-Return Line-Feed</record_delimiter>
            <Record_Character>
                <fields>4</fields>
                <groups>0</groups>
                <record_length unit="byte">50</record_length>
                <Field_Character>
                    <name>Z_BREUS</name>
                    <field_number>1</field_number>
                    <field_location unit="byte">1</field_location>
                    <data_type>ASCII_Real</data_type>
                    <field_length unit="byte">12</field_length>
                    <unit>Km</unit>
                    <description>
                    Altitude of measurement relative to 6.1 mbar equipotential surface at place of occultation, as provided by Breus
                    </description>
                </Field_Character>
                <Field_Character>
                    <name>Z_MOLA</name>
                    <field_number>2</field_number>
                    <field_location unit="byte">13</field_location>
                    <data_type>ASCII_Real</data_type>
                    <field_length unit="byte">12</field_length>
                    <unit>Km</unit>
                    <description>
                    Altitude of measurement relative to MOLA equipotential surface at place of occultation
                    </description>
                </Field_Character>
                <Field_Character>
                    <name>RADIAL_DISTANCE</name>
                    <field_number>3</field_number>
                    <field_location unit="byte">25</field_location>
                    <data_type>ASCII_Real</data_type>
                    <field_length unit="byte">12</field_length>
                    <unit>Km</unit>
                    <description>
                    Radial distance of measurement
                    </description>
                </Field_Character>
                <Field_Character>
                    <name>ELECTRON_DENSITY</name>
                    <field_number>4</field_number>
                    <field_location unit="byte">37</field_location>
                    <data_type>ASCII_Real</data_type>
                    <field_length unit="byte">12</field_length>
                    <unit>Cm^-3</unit>
                    <description>
                    Electron density measurement
                    </description>
                </Field_Character>
            </Record_Character>
        </Table_Character>
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