Dynamical fine structures of the chromosphere |
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Authors: | G. Tsiropoula B. Schmieder C. E. Alissandrakis |
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Affiliation: | (1) Institute of Space Research, National Observatory of Athens, P.O. Box 20048, GR-11810 Athens, Greece;(2) Observatoire de Paris, DASOP, F-92195 Meudon Principal Cedex, France;(3) Section of Astrophysics, Astronomy and Mechanics, Department of Physics, University of Athens, GR-15784 Athens, Greece |
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Abstract: | We have studied the spatial structure and temporal evolution of a chromospheric region with chains of mottles at the junction of three supergranules. The observations were obtained with the Multichannel Subtractive Double Pass spectrograph operating in H at the Pic du Midi Observatory. From a statistical point of view the fine structures were stable in intensity over the observation period (15 min), while the line of sight velocity showed remarkable changes within a few minutes. A detailed analysis shows that the predominant pattern of bulk motion in the dark mottles is that of downflow at their footpoints and upflow at their tops, which is followed by downflows along the whole structure and that this process repeats itself several times during their lifetime. |
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Keywords: | Sun chromosphere fine structure |
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