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Table 1

Observational parameters.

Spectral line Fe I 557.66 nm
Date of observations 2007-June-30
Telescope VTT at Izaña, Tenerife
Start of first scan UT 8:05
End of last scan UT 8:46
Location at Sun disk center

  TESOS (*) high resolution mode
  FPI bandwidth 1.9 pm
  FPI scanning step width 0.83 pm
  number of steps per scan 101
  scan range 83 pm
  exposure time 50 ms
  scan duration (1 profile)  ≈20 s
  scanning cadence 25 s
  number of scans 100

Notes. (*) Triple Etalon Solar Spectrometer, Tritschler et al. (2002).

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