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ORFEUS II Artifacts

2. Artifacts

  1. Testpulse peak

  2. Some spectra show a peak at 1317 Å in order 42, which is due to a not completely removed testpulse peak of the echelle electronics.
  3. Airglow und geocorona

    • Airglow: OI lines at 1302, 1305 and 1306 Å, also at 989 Å
    • Geocorona: Ly-alpha (very strong) at 1216 Å, Ly-beta at 1026 Å

See also this Echelle demo image:

The above page was written by Jürgen Barnstedt from the ORFEUS Group at Tübingen and is reproduced here for the MAST archive with his permission.