Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-03-28
Astronomy and Astrophysics
Astrophysics
In press,"Physics of Chromospheric Plasmas" (Coimbra), ASP 368, 115 (2007)
Scientific paper
We measure variations in orientation of fourteen dynamic fibrils as a function of time in a small isolated plage and nearby network using a 10-min time sequence of H-alpha filtergrams obtained by the Dutch Open Telescope. We found motions with average angular velocities of the order of 1 deg/min suggesting systematic turning from one limit position to another, particularly apparent in the case of fibrils with lifetimes of a few minutes. Shorter fibrils tend to turn faster than longer ones, which we interpret as due to vortex flows in the underlying granulation that twist magnetic fields.
Koza Julius
Kučera Antonín
Rybák Ján
Sutterlin Peter
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