BRIGHTNESS VARIATIONS OF Mg Ib BRIGHT FEATURES |
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Authors: | Dara HC Koutchmy S Zachariadis ThG Alissandrakis CE |
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Institution: | (1) Research Center for Astronomy and Applied Mathematics, Academy of Athens, Greece;(2) Institut d'Astrophysique, CNRS, Paris, France;(3) Section of Astro-Geophysics, Department of Physics, University of Ioannina, Greece |
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Abstract: | We study the temporal intensity variations of Mgib bright features and investigate the corresponding Hα velocity pattern.
The network bright features are well visible in the continuum, in images averaged over the duration of the observations (130 min).
We detected `flashing' bright features, which appear and disappear within two to five minutes, while the rest of the bright
features undergo small variations of either their shape and/or their intensity. A power spectrum analysis reveals a 10-min
oscillation for approximately half of the stable bright features. The 5-min oscillations are detected mainly at the network
boundaries, where stable bright features are located, while 3-min oscillations coincide with few bright features, but are
also quite intense inside the network cells. The majority of bright features are associated with Hα downflows. The downflow
is very intense at the location of `flashing' bright features. |
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