Dopplergram data corrections

[Breno Raphaldini]

Hi all,

I am currently downloading Dopplergram data of active regions to use to estimate their magnetic helicity. I noticed that the data comes without corrections associated with the relative velocity of the instrument relative to the Sun.

So I ask, how do I get the information on the relative velocity of the instrument at each time? Are there any other corrections that need to be made?

Best regards,

Breno

[Schuehle Dr., Udo]

Hi,

if you get data from the Solar Orbiter, they have solar ephemeris data included which contain the velocity information in the OBS_VR keyword, e. g.,:

and 

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   Udo Schuehle                                                                                email:  schu...@mps.mpg.de
   Max Planck Institute for Solar System Research                          Tel:  +49 551 384 979 458
   Justus-von-Liebig-Weg 3                                                              Fax: +49 551 384 979 8458
   37077 Göttingen, Germany                                                           http://www.mps.mpg.de/

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