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Some results of the photospheric large-scale velocity research from Belgrade observations

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Abstract

On the basis of the possibility of sight-line velocity observations by a special equatorial solar spectrograph, a research programme for detection of photospheric large-scale velocities has been initiated. The first series of observations in the FeI 6302 Å absorption line has been limited to the central meridian.

The ‘combined’ limb effect assumed to incorporate an unresolved stationary photospheric motion, has been evaluated. The observed asymmetry of the obtained curve is mainly explained by dB 0/dt.

The remaining sight-line velocities along the central meridian, taken as random, gave an r.m.s. value of 32 m s−1. In a few cases a certain kinematic situation in some areas along the central meridian lasted for 2 to 4 consecutive days. It is assumed that such velocity features belong to the kinematic picture of a large-scale photospheric motion which, as a whole, has not yet been clearly seen.

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Authors and Affiliations

  1. Astronomical Observatory, Volgina 7, 11050, Belgrade, Yugoslavia

    A. Kubičela

  2. Faculty of Sciences, Stud. Trg 16, 11000, Belgrade, Yugoslavia

    M. Karabin

Authors
  1. A. Kubičela
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  2. M. Karabin
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Kubičela, A., Karabin, M. Some results of the photospheric large-scale velocity research from Belgrade observations. Sol Phys 52, 199–210 (1977). https://doi.org/10.1007/BF00935802

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  • DOI: https://doi.org/10.1007/BF00935802

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