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EVOLUTION IN SPACE AND TIME OF SUPERPENUMBRAL CHROMOSPHERIC FIBRILS

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Abstract

We have studied the spatial structure and temporal evolution of the intensity and Doppler velocity of dark fibrils forming the superpenumbra of an isolated regular sunspot. The observations were obtained with the Multichannel Subtractive Double Pass (MSDP) spectrograph which operates in Hα and is installed at the focus of the Vacuum Tower Telescope (VTT) at Tenerife (Canary Islands). The fibril pattern shows a remarkable stability during the period of our observations (64 min). Moreover, almost all individual fibrils are identifiable in all frames, but they undergo continual changes in contrast, shape and size. Investigating the temporal evolution of intensity and velocity of individual fibrils, fluctuations were found which have a quasi periodic behavior. As mechanisms for these changes we may suggest (a) change of the Doppler shift due to a wave, (b) periodic changes of the density of the Hα absorbing material, (c) disappearance and reappearance of fibrils, in more or less the same magnetic flux tube, at regular intervals.

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Authors and Affiliations

  1. Institute of Space Research, National Observatory of Athens, Lofos Koufos, 15236, Palea Penteli, Greece

    G. Tsiropoula & D. Dialetis

  2. Section of Astrogeophysics, University of Ioannina, GR-45110, Ioannina, Greece

    C. E. Alissandrakis

  3. Observatoire de Paris, DASOP, F-92195, Meudon Principal Cedex, France

    P. Mein & N. Mein

Authors
  1. G. Tsiropoula
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  2. D. Dialetis
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  3. C. E. Alissandrakis
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  4. P. Mein
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  5. N. Mein
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Tsiropoula, G., Dialetis, D., Alissandrakis, C.E. et al. EVOLUTION IN SPACE AND TIME OF SUPERPENUMBRAL CHROMOSPHERIC FIBRILS. Solar Physics 172, 139–149 (1997). https://doi.org/10.1023/A:1004939631975

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  • DOI: https://doi.org/10.1023/A:1004939631975

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