Temporal variations in fibril orientation
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Publication date
2007
Authors
Koza, J.
Sütterlin, P.
Kucera, A.
Rybák, J.
Editors
Heinzel, Petr
Dorotovic, Ivan
Rutten, Robert J.
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Abstract
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 Hα filtergrams obtained by the Dutch Open Telescope. We found motions with average angular velocities of the order of 1 deg min−1 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.
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Koza, J, Sütterlin, P, Kucera, A & Rybák, J 2007, Temporal variations in fibril orientation. in P Heinzel, I Dorotovic & R J Rutten (eds), The physics of chromospheric plasmas : proceedings of the Coimbra Solar Physics Meeting held at the University of Coimbra, Coimbra, Portugal, October 9 - October 13, 2006. Astronomical Society of the Pacific conference series, no. 368, Astronomical Society of the Pacific, San Francisco, pp. 115-118.