Abstract
This paper describes a method developed and used at the Main (Pulkovo)
Observatory, Russian Academy of Sciences, for recording Doppler shifts, as well as the
broadenings of spectral lines caused by their Zeeman splitting, from digital optical
spectrograms of active regions of the sun. It is shown that, in fairly prolonged (more
than 4h) continuous observations, long-period variations of the line-of-sight velocities
and the magnetic field, with a characteristic period of about 80min, are detected in
sunspots and in magnetic elements of the surrounding photosphere. These variations are
interpreted as vertical or line-of-sight oscillations of the entire spot (or the
magnetic element) as a whole, caused by perturbing action from the surrounding turbulent
medium (the photosphere and the convective zone).
© 2008 Optical Society of America
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