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    <ResourceHeader>
      <ResourceName>Wind 3DP SST Open Proton Energy-Angle Distributions</ResourceName>
      <DOI>https://doi.org/10.48322/yw1c-yf03</DOI>
      <ReleaseDate>2025-12-04T13:32:49Z</ReleaseDate>
      <RevisionHistory>
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      <Description>Proton energy-angle distributions 70 keV - 6.8 MeV, often at 24 sec, SST Open, Wind 3DP - R. Lin (UC Berkeley)</Description>
      <Acknowledgement>Principle Investigators Robert Lin and Stuart Bale, the Wind 3DP team, and the Space Physics Data Facility (SPDF)/NASA GSFC</Acknowledgement>
      <PublicationInfo>
        <Authors>Lin, Robert P.; Bale, Stuart D.; &amp; Wilson III, Lynn B.</Authors>
        <PublicationDate>2021-01-01T00:00:00</PublicationDate>
        <PublishedBy>Space Physics Data Facility</PublishedBy>
      </PublicationInfo>
      <Contact>
        <PersonID>spase://SMWG/Person/Robert.P.Lin</PersonID>
        <Role>PrincipalInvestigator</Role>
      </Contact>
      <Contact>
        <PersonID>spase://SMWG/Person/Stuart.D.Bale</PersonID>
        <Role>PrincipalInvestigator</Role>
      </Contact>
      <Contact>
        <PersonID>spase://SMWG/Person/Robert.E.McGuire</PersonID>
        <Role>GeneralContact</Role>
      </Contact>
      <InformationURL>
        <Name>Caveats to the use of Wind 3DP data</Name>
        <URL>https://spdf.gsfc.nasa.gov/pub/data/wind/3dp/wind3dp_caveats.pdf</URL>
        <Description>Caveats for the correct use of Wind 3DP datasets</Description>
      </InformationURL>
      <InformationURL>
        <Name>Wind 3DP home page at UCB</Name>
        <URL>http://sprg.ssl.berkeley.edu/wind3dp/</URL>
        <Description>home page at UCB (with plotting and digital data)</Description>
      </InformationURL>
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      <AccessURL>
        <Name>FTPS from SPDF (not with most browsers)</Name>
        <URL>ftps://spdf.gsfc.nasa.gov/pub/data/wind/3dp/3dp_sopd/</URL>
        <Description>In CDF via ftp from SPDF</Description>
      </AccessURL>
      <AccessURL>
        <Name>HTTPS from SPDF</Name>
        <URL>https://spdf.gsfc.nasa.gov/pub/data/wind/3dp/3dp_sopd/</URL>
        <Description>In CDF via HTTP from SPDF</Description>
      </AccessURL>
      <Format>CDF</Format>
      <Acknowledgement>Please acknowledge the CDAWeb team at GSFC/SPDF.</Acknowledgement>
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      <AccessURL>
        <Name>CDAWeb HAPI Server</Name>
        <URL>https://cdaweb.gsfc.nasa.gov/hapi</URL>
        <Style>HAPI</Style>
        <ProductKey>WI_SOPD_3DP</ProductKey>
        <Description>Web Service to this product using the HAPI interface.</Description>
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      <Format>CSV</Format>
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    <InstrumentID>spase://SMWG/Instrument/Wind/3DP</InstrumentID>
    <MeasurementType>EnergeticParticles</MeasurementType>
    <TemporalDescription>
      <TimeSpan>
        <StartDate>1994-11-15T12:56:18.000Z</StartDate>
        <RelativeStopDate>-P30D</RelativeStopDate>
      </TimeSpan>
      <Cadence>PT24S</Cadence>
    </TemporalDescription>
    <ObservedRegion>Heliosphere.NearEarth</ObservedRegion>
    <Parameter>
      <Name>Epoch</Name>
      <ParameterKey>Epoch</ParameterKey>
      <Description>Number of milliseconds since CDF_EPOCH: 0000-01-01T00:00:00.000.</Description>
      <Units>ms</Units>
      <UnitsConversion>1e-3&gt;s</UnitsConversion>
      <ValidMin>01-Jan-1956 00:00:00.000</ValidMin>
      <ValidMax>01-Jan-2083 00:00:00.000</ValidMax>
      <FillValue>-1.0E31</FillValue>
      <Support>
        <SupportQuantity>Temporal</SupportQuantity>
      </Support>
    </Parameter>
    <Parameter>
      <Name>Unix Time</Name>
      <ParameterKey>TIME</ParameterKey>
      <Description>Time since 1970-01-01T00:00:00Z in seconds</Description>
      <Units>s</Units>
      <Support>
        <SupportQuantity>Temporal</SupportQuantity>
      </Support>
    </Parameter>
    <Parameter>
      <Name>Electron Flux</Name>
      <ParameterKey>FLUX</ParameterKey>
      <Description>Proton number flux 70 keV to 6.8 MeV in 9 energy and 8 pitch angle bins. The first dimension corresponds to 9 time dependent energy bands (parameter ENERGY,centered from ~70 keV to 6.8 MeV). The 2nd dimension corresponds to 8 time dependent pitch angles (parameter PANGLE, ranging from ~15 deg to ~165 deg)</Description>
      <Units>#/(cm^2*ster*eV*s)</Units>
      <Structure>
        <Size>9 8</Size>
      </Structure>
      <Particle>
        <ParticleType>Electron</ParticleType>
        <ParticleQuantity>NumberFlux</ParticleQuantity>
        <EnergyRange>
          <Low>70000</Low>
          <High>6800000</High>
          <Units>eV</Units>
        </EnergyRange>
        <AzimuthalAngleRange>
          <Low>0</Low>
          <High>360</High>
          <Units>degrees</Units>
        </AzimuthalAngleRange>
        <PolarAngleRange>
          <Low>0</Low>
          <High>180</High>
          <Units>degrees</Units>
        </PolarAngleRange>
      </Particle>
    </Parameter>
    <Parameter>
      <Name>Electron Pitch Angle</Name>
      <ParameterKey>PANGLE</ParameterKey>
      <Description>Time-varying proton pitch angles in 8 angular bins</Description>
      <Units>degree</Units>
      <Structure>
        <Size>8</Size>
        <Description>The 8 average pitch angles for this pitch angle distribution</Description>
      </Structure>
      <Particle>
        <ParticleType>Electron</ParticleType>
        <Qualifier>DirectionAngle</Qualifier>
        <ParticleQuantity>ArrivalDirection</ParticleQuantity>
      </Particle>
    </Parameter>
    <Parameter>
      <Name>Electron Energy</Name>
      <ParameterKey>ENERGY_filled</ParameterKey>
      <Description>Time-varying proton energies in 9 channels</Description>
      <Units>eV</Units>
      <Structure>
        <Size>9</Size>
        <Description>The 9 average electron energies for this pitch angle distribution</Description>
      </Structure>
      <Particle>
        <ParticleType>Electron</ParticleType>
        <Qualifier>Average</Qualifier>
        <ParticleQuantity>Energy</ParticleQuantity>
        <EnergyRange>
          <Low>70000</Low>
          <High>6800000</High>
          <Units>eV</Units>
        </EnergyRange>
      </Particle>
    </Parameter>
    <Parameter>
      <Name>SW Velocity vector</Name>
      <ParameterKey>VSW</ParameterKey>
      <Description>SW Velocity vector (from ions and ground-based processing)</Description>
      <Units>km/s</Units>
      <CoordinateSystem>
        <CoordinateRepresentation>Cartesian</CoordinateRepresentation>
        <CoordinateSystemName>GSE</CoordinateSystemName>
      </CoordinateSystem>
      <Structure>
        <Size>3</Size>
        <Element>
          <Name>VSWion_x</Name>
          <Index>1</Index>
          <ValidMin>-3000</ValidMin>
          <ValidMax>3000</ValidMax>
        </Element>
        <Element>
          <Name>VSWion_y</Name>
          <Index>2</Index>
          <ValidMin>-3000</ValidMin>
          <ValidMax>3000</ValidMax>
        </Element>
        <Element>
          <Name>VSWion_z</Name>
          <Index>3</Index>
          <ValidMin>-3000</ValidMin>
          <ValidMax>3000</ValidMax>
        </Element>
      </Structure>
      <Particle>
        <ParticleType>Ion</ParticleType>
        <Qualifier>Moment</Qualifier>
        <ParticleQuantity>FlowVelocity</ParticleQuantity>
        <EnergyRange>
          <Low>70000</Low>
          <High>6800000</High>
          <Units>eV</Units>
        </EnergyRange>
      </Particle>
    </Parameter>
    <Parameter>
      <Name>Magnetic field vector in GSE coordinates</Name>
      <ParameterKey>MAGF</ParameterKey>
      <Description>Magnetic field vector in GSE coordinates</Description>
      <Units>nT</Units>
      <CoordinateSystem>
        <CoordinateRepresentation>Cartesian</CoordinateRepresentation>
        <CoordinateSystemName>GSE</CoordinateSystemName>
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          <Index>1</Index>
          <ValidMin>-500</ValidMin>
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          <ValidMin>-500</ValidMin>
          <ValidMax>500</ValidMax>
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        <Element>
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          <Index>3</Index>
          <ValidMin>-500</ValidMin>
          <ValidMax>500</ValidMax>
        </Element>
      </Structure>
      <Field>
        <Qualifier>Average</Qualifier>
        <Qualifier>Vector</Qualifier>
        <FieldQuantity>Magnetic</FieldQuantity>
      </Field>
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