Abstract
New observational data on long-period oscillations of the line-of-sight velocities detected via the Doppler shifts of spectral lines observed at various heights in and near sunspots are presented. The sunspots and nearby magnetic elements oscillate with periods ranging from 40 to 80 min. The oscillations in the line-of-sight velocities persist over the entire observation session (up to four hours). These results support theoretical models in which this phenomenon represents natural long-period oscillations (vertical-radial displacements) of entire magnetic elements (sunspots, pores, and magnetic knots) about some stable equilibrium positions.
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Original Russian Text © V.I. Efremov, L.D. Parfinenko, A.A. Solov’ev, 2007, published in Astronomicheskiĭ Zhurnal, 2007, Vol. 84, No. 5, pp. 450–460.
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Efremov, V.I., Parfinenko, L.D. & Solov’ev, A.A. Long-period oscillations of the line-of-sight velocities in and near sunspots at various levels in the photosphere. Astron. Rep. 51, 401–410 (2007). https://doi.org/10.1134/S106377290705006X
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DOI: https://doi.org/10.1134/S106377290705006X