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   <Version>2.2.6</Version>
   <NumericalData>
      <ResourceID>spase://CDPP/NumericalData/AMDA/MGS/PROXY/mgs-proxy-drap</ResourceID>
      <ResourceHeader>

         <ResourceName>IMF draping direction</ResourceName>

         <ReleaseDate>2015-10-12T10:48:29Z</ReleaseDate>

         <Description></Description>
         <Acknowledgement></Acknowledgement>

         <Contact>        

            <PersonID>spase://CDPP/Person/David.Brain</PersonID>
            <Role>TechnicalContact</Role>

         </Contact>
         <InformationURL>

           <Name>MGS Proxy webpage</Name>            
           <URL>http://sprg.ssl.berkeley.edu/~brain/proxies/drapingdirxn.html</URL>         

         </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>

         <Acknowledgement>           
         </Acknowledgement>
      </AccessInformation>

      <ProviderName>david Brain</ProviderName> 

      <InstrumentID>spase://CDPP/Instrument/AMDA/MGS/PROXY</InstrumentID>

      <MeasurementType>MagneticField</MeasurementType>

      <TemporalDescription>
         <TimeSpan>

             <StartDate>1999-04-02T15:50:49Z</StartDate>
             <StopDate>2006-10-27T14:20:34Z</StopDate>

         </TimeSpan>

         <Cadence_Min>PT1H</Cadence_Min>
       <Cadence_Max>PT2H</Cadence_Max>   

       </TemporalDescription>
      <ObservedRegion>Mars</ObservedRegion>

      <Caveats>

* IMF direction can change on any timescale, from seconds to minutes to hours to days. Therefore, determination of the direction of the ambient magnetic field between 50-60 N latitude on the dayside maynot provide a reliable indication of the IMF direction over an entire MGS 2-hour orbital period. Please use appropriate caution when using the information on this page.     
* We do not believe that IMF draping direction is accurate to more than ~90o, due to contributions of ionospheric current-generated magnetic fields to the ambient field measured at 400 km altitudes by MGS. Further, anti-solar "weathervaning" of the ambient magnetic field is observed more prominently for one set of IMF directions (dawnward upstream IMF).
* Keep in mind that Mars "rocks" back and forth with respect to the Sun over the course of a single year, and therefore the azimuth angle (which is defined relative to the planetary rotation axis) rocks back and forth by as much as 25o as well.      
* I use only publicly available MGS data, since those data have been fully calibrated. Therefore, the timeseries will usually be several months "behind" the current date. You can always email me to see whether the page is as up-to-date as possible.
    </Caveats>          
      <Parameter>
         <Name>draping_azimuth_ang</Name>
         <ParameterKey>mgs_drap_ang</ParameterKey>
         <Description/>
         <Ucd/>
         <Units>deg</Units>
         <UnitsConversion/>
         <Field>
            <FieldQuantity>Magnetic</FieldQuantity>
         </Field>
      </Parameter>
   </NumericalData>

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