Intensity oscillation in Hα-fine structure |
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| Authors: | Arvind Bhatnagar Katsuo Tanaka |
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| Institution: | (1) Big Bear Solar Observatory, Hale Observatories, Carnegie Institution of Technology, California Institute of Technology, California, U.S.A. |
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| Abstract: | Using a new technique of directly measuring the intensity variation from the 16 mm time-lapse filtergram movies taken in the blue wing and in the line center of H , we found periodic intensity oscillations in the center of H-supergranulation network, in rosette centers and in plage granules. The oscillatory period of intensity in the network is of the order of 170 ± 44 seconds while in regions of stronger magnetic field, such as in plages and in rosettes, the period was found to be longer, on the order of 300 ± 50 seconds. It is suggested that observed intensity oscillation in the rosette center is related to the shooting out of dark mottles from rosettes. Oscillatory intensity fluctuations have been also observed in the sunspot umbra. |
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