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    <Version>2.2.6</Version>
    <NumericalData>
        <ResourceID>spase://CDPP/NumericalData/AMDA/IMP-8/MIT/imp-mit-k0</ResourceID>
        <ResourceHeader>

            <ResourceName>best fit</ResourceName>

            <AlternateName>IMP 8 Solar Wind Plasma Faraday Cup Data</AlternateName>
            <ReleaseDate>2015-10-16T16:25:59Z</ReleaseDate>
            <Description>The MIT Faraday cup experiment on IMP 8 measures 
currents from solar wind ions, and from these measurements we calculate 
the velocity, density, and temperature of the solar wind. The IMP 8 data 
files consist of fine resolution data (approximately 1 minute resolution).

            IMP 8 spins with a period of approximately 2.7s. The Faraday 
Cup (FC) instrument scans the solar wind distribution stepping through a 
contiguous set of energy windows, one step per spacecraft spin. The FC 
instrument divides the spin into thirty-two, 11.25 degree angular sectors 
and integrates the measured currents over different angular sectors 
depending upon the Mode in which the instrument is operating. The border 
between two of the 11.25 degree angular sectors lies on the Sun-spacecraft 
line.

            The FC sensor collector plate is divided into two, 
semi-circular halves; the division line is parallel to the spacecraft spin 
plane which is approximately parallel to the ecliptic plane. The split 
collector allow determination of the bulk plasma flow relative to the spin 
plane; North/South angles refer to flows coming from above or below the 
spin plane respectively (flows from the South are designated as having a 
positive N/S angle).

            The bulk flow angle in the spin plane is determined from the 
measurements of current vs. rotation angle. The currents telemetered to 
the ground are the sums of currents for the two half-collectors ("A" and 
"B") and, for the TMS and AQM modes, also the current for the 
half-collector "B".

            Electrons are measured except for the eight angles near the Sun.

            The experiment has two memories only one of which is operating 
perfectly. As a result, only every other TMS spectrum is usable, and the 
time between spectra is usually twice that that would be expected from the 
spacecraft spin rate. The bad half-memory also limits the energy windows 
that can be used in the other modes, since they require both memories to 
hold the data. On occasion, the data are read out rapidly enough by the 
spacecraft to allow repeated use of the good half-memory, and the time 
resolution in the TMS is approximately 32 seconds.</Description>
            <Acknowledgement>For papers and presentations using these data, 
please acknowledge the MIT Space Plasma Physics Group and the path through
which you accessed the data.</Acknowledgement>
            <Contact>
                <PersonID>spase://SMWG/Person/Alan.J.Lazarus</PersonID>
                <Role>PrincipalInvestigator</Role>
            </Contact>
            <Contact>
                <PersonID>spase://SMWG/Person/John.D.Richardson</PersonID>
                <Role>TeamMember</Role>
            </Contact>
            <InformationURL>
                <Name>Readme file at SPDF</Name>
                <URL>ftp://spdf.gsfc.nasa.gov/pub/data/imp/imp8/plasma_mit/sw_msheath_min/00readme.txt</URL>
                <Description>Text created by MIT IMP8 plasma team</Description>
            </InformationURL>
        </ResourceHeader>
        <AccessInformation>
            <RepositoryID>spase://SMWG/Repository/CDPP/AMDA</RepositoryID>
            <Availability>Online</Availability>
            <AccessRights>Open</AccessRights>
            <AccessURL>
                <Name>AMDA at CDPP</Name>
                <URL>http://amda.cdpp.eu</URL>
            </AccessURL>
            <Format>NetCDF</Format>
        </AccessInformation>
        <ProviderName>NSSDC</ProviderName>
        <ProcessingLevel>Calibrated</ProcessingLevel>
        <InstrumentID>spase://CDPP/Instrument/AMDA/IMP8/PLS</InstrumentID>
        <MeasurementType>ThermalPlasma</MeasurementType>
        <TemporalDescription>
            <TimeSpan>

                <StartDate>1973-10-31T20:10:27Z</StartDate>
                <StopDate>2006-07-26T17:10:35Z</StopDate>

            </TimeSpan>
            <Cadence>PT58S</Cadence>
        </TemporalDescription>
        <ObservedRegion>Heliosphere.NearEarth</ObservedRegion>
        <ObservedRegion>Earth.Magnetosheath</ObservedRegion>
        <Parameter>

            <Name>density</Name>

            <ParameterKey>imp_mit_nfit</ParameterKey>
            <Description>(Better, from fits) Proton number density</Description>
            <Ucd>phys.density;phys.atmol.ionStage</Ucd>
            <Units>cm^-3</Units>
            <UnitsConversion>1e6&gt;m^-3</UnitsConversion>
            <RenderingHints>
                <DisplayType>TimeSeries</DisplayType>
            </RenderingHints>
            <ValidMin>0.0</ValidMin>
            <ValidMax>100.0</ValidMax>
            <FillValue>9999.0</FillValue>
            <Particle>
                <ParticleType>Proton</ParticleType>
                <ParticleType>Ion</ParticleType>
                <Qualifier>Fit</Qualifier>
                <Qualifier>Scalar</Qualifier>
                <ParticleQuantity>NumberDensity</ParticleQuantity>
            </Particle>
        </Parameter>
        <Parameter>

            <Name>v_bulk</Name>

            <ParameterKey>imp_mit_vfit</ParameterKey>
            <Description>(Better, from fits) Ion Flow Velocity (aberration corrected)</Description>
            <Ucd>phys.veloc;phys.atmol.ionStage</Ucd>
            <Units>km/s</Units>
            <UnitsConversion>1e3&gt;m/s</UnitsConversion>
            <CoordinateSystem>
                <CoordinateRepresentation>Spherical</CoordinateRepresentation>
                <CoordinateSystemName>GSE</CoordinateSystemName>
            </CoordinateSystem>
            <RenderingHints>
                <DisplayType>TimeSeries</DisplayType>
            </RenderingHints>
            <ValidMin>100.0</ValidMin>
            <ValidMax>3000.0</ValidMax>
            <FillValue>9999.0</FillValue>
            <Particle>
                <ParticleType>Proton</ParticleType>
                <ParticleType>Ion</ParticleType>
                <Qualifier>Fit</Qualifier>
                <Qualifier>Magnitude</Qualifier>
                <ParticleQuantity>FlowVelocity</ParticleQuantity>
            </Particle>
        </Parameter>
        <Parameter>

            <Name>v_thermal</Name>

            <ParameterKey>imp_mit_vthfit</ParameterKey>
            <Description>(Better, from fits) Proton most-probable thermal 
                speed (aberration corrected).  Thermal speed is the most probable thermal 
                speed (i.e., the square root of [2kT/m(proton)]). To convert thermal speed 
                to temperature in eV, multiply 0.0052 by the square of the thermal speed; 
                to convert to temperature [K], multiply the square of the thermal speed by 
                60.5.</Description>
            <Ucd>phys.veloc;phys.atmol.ionStage</Ucd>
            <Units>km/s</Units>
            <UnitsConversion>1e3&gt;m/s</UnitsConversion>
            <RenderingHints>
                <DisplayType>TimeSeries</DisplayType>
            </RenderingHints>
            <ValidMin>1.0</ValidMin>
            <ValidMax>500.0</ValidMax>
            <FillValue>9999.0</FillValue>
            <Particle>
                <ParticleType>Proton</ParticleType>
                <ParticleType>Ion</ParticleType>
                <Qualifier>Fit</Qualifier>
                <Qualifier>Scalar</Qualifier>
                <ParticleQuantity>ThermalSpeed</ParticleQuantity>
            </Particle>
        </Parameter>
        <Parameter>

            <Name>flow angle e/w</Name>

            <ParameterKey>imp_mit_velewfit</ParameterKey>
            <Description>(Best, from fits) Proton East/West flow angle 
                (aberration corrected). Azimuth is E/W, meaning bulk flow from the East 
                or the West side of the Sun respectively. Positive azimuth angle means 
                flow from the West.</Description>
            <Ucd>pos.posAng;phys.veloc;phys.atmol.ionStage</Ucd>
            <Units>deg</Units>
            <CoordinateSystem>
                <CoordinateRepresentation>Spherical</CoordinateRepresentation>
                <CoordinateSystemName>GSE</CoordinateSystemName>
            </CoordinateSystem>
            <RenderingHints>
                <DisplayType>TimeSeries</DisplayType>
            </RenderingHints>
            <ValidMin>-45.0</ValidMin>
            <ValidMax>45.0</ValidMax>
            <FillValue>9999.0</FillValue>
            <Particle>
                <ParticleType>Proton</ParticleType>
                <ParticleType>Ion</ParticleType>
                <Qualifier>Fit</Qualifier>
                <Qualifier>DirectionAngle.AzimuthAngle</Qualifier>
                <ParticleQuantity>FlowVelocity</ParticleQuantity>
            </Particle>
        </Parameter>
        <Parameter>

            <Name>flow angle n/s</Name>

            <ParameterKey>imp_mit_velnsfit</ParameterKey>
            <Description>(Best, from fits) Proton North/South flow angle 
                (aberration corrected). Azimuth is N/S, meaning bulk flow from the North 
                or the South side of the Sun respectively. Positive azimuth angle means 
                flow from the North.
            </Description>
            <Ucd>pos.posAng;phys.veloc;phys.atmol.ionStage</Ucd>
            <Units>deg</Units>
            <CoordinateSystem>
                <CoordinateRepresentation>Spherical</CoordinateRepresentation>
                <CoordinateSystemName>GSE</CoordinateSystemName>
            </CoordinateSystem>
            <RenderingHints>
                <DisplayType>TimeSeries</DisplayType>
            </RenderingHints>
            <ValidMin>-45.0</ValidMin>
            <ValidMax>45.0</ValidMax>
            <FillValue>9999.0</FillValue>
            <Particle>
                <ParticleType>Proton</ParticleType>
                <ParticleType>Ion</ParticleType>
                <Qualifier>Fit</Qualifier>
                <Qualifier>DirectionAngle.AzimuthAngle</Qualifier>
                <ParticleQuantity>FlowVelocity</ParticleQuantity>
            </Particle>
        </Parameter>
     </NumericalData>
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