<?xml version="1.0" encoding="UTF-8"?>
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  <Version>2.4.1</Version>
  <Instrument>
    <ResourceID>spase://CNES/Instrument/CDPP-AMDA/Geotail/EFD</ResourceID>
    <ResourceHeader>
      <ResourceName>EFD</ResourceName>
      <AlternateName>Geotail Electric Field Detector</AlternateName>
      <ReleaseDate>2019-05-05T12:34:56.789</ReleaseDate>
      <Description>
        The objectives of this investigation are studies of (1) the large scale configuration of the electric field in the magnetotail, 
        (2) tail electric field variations during substorms, (3) the electric field in the plasma sheet, 
        (4) the electric field near the magnetopause and in the plasma mantle at locations tailward of those covered by similar measurements  
        on ISEE 1, (5) micropulsation and low frequency wave measurements at frequencies covering the local gyrofrequency (.LT.1Hz) and  
        lower hybrid frequency (.LT.10Hz) in the tail, (6) plasma density as deduced from measurement of the floating potential of the spacecraft,  
        and (7) electric field comparisons (with the aid of the other spacecraft in the ISTP program) at different points along the same  
        magnetic field line, at different points along a common boundary, or in different regions of the magnetosphere.  
        The instrument consists of two orthogonal double probes, each of which is a pair of separated spheres on wire booms  
        that are located in the satellite spin plane and whose difference of potential is measured.  
        The separation distances between the pair of sensors are variable and as great as 160 m tip-to-tip.  
        One operating mode involves length ratios of the two antennas of about 2:1 in order to verify instrument operation  
        through showing that the electric field signature is proportional to the boom length. A second reason for two pairs of  
        wire booms in the satellite spin plane is the requirement for measurements having a time resolution far better than  
        the satellite spin period. 
        
      </Description>
      <Contact>
        <PersonID>spase://SMWG/Person/Koichiro.Tsuruda</PersonID>
        <Role>PrincipalInvestigator</Role>
      </Contact>
      <Contact>
        <PersonID>spase://SMWG/Person/Forrest.S.Mozer</PersonID>
        <Role>CoInvestigator</Role>
      </Contact>
      <InformationURL>
        <Name>ISTP site at NASA/GSFC</Name>
        <URL>https://pwg.gsfc.nasa.gov/geotail.shtml</URL>
        <Description>Geotail mission description and contacts</Description>
      </InformationURL> 
    </ResourceHeader>
    <InstrumentType>DoubleSphere</InstrumentType>
    <InvestigationName>Electric Field Detector</InvestigationName>
    <ObservatoryID>spase://CNES/Observatory/CDPP-AMDA/Geotail</ObservatoryID>
  </Instrument>
</Spase>