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On small active region filaments,fibrils and surges |
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| Authors: | Y Lin SF Martin O Engvold LHM Rouppe van der Voort M van Noort |
| Institution: | 1. Helio Research, 5212 Maryland Avenue, La Crescenta, CA 91214, USA;2. Institute of Theoretical Astrophysics, University of Oslo, P.O. Box 1029, Blindern, N-0315 Oslo, Norway;3. Centre of Mathematics for Applications, University of Oslo, P.O. Box 1053, Blindern, N-0316 Oslo, Norway;4. Institute for Solar Physics of the Royal Swedish Academy of Sciences, AlbaNova University Center, SE-106 91 Stockholm, Sweden |
| Abstract: | High resolution Hα images and magnetograms (0.2 arc s) of an active region were obtained in alternating time series at 42 s cadences using the Swedish 1-m Solar Telescope on 2004 August 21. The Hα filtergrams reveal an active region filament and surges consisting of thread-like structures which have widths similar to the widths of chromospheric fibrils, both recorded down to the resolution limit in the best images. All observed structures in the active region appear highly dynamic. Fibrils show counterstreaming strongly resembling the counterstreaming threads in filaments. |
| Keywords: | Active region filaments Fibrils Surges |
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