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Mini-filaments – small-scale analogues of solar eruptive events?

Published online by Cambridge University Press:  01 November 2008

Carsten Denker
Affiliation:
Astrophysikalisches Institut Potsdam, An der Sternwarte 16, D-14482 Potsdam, Germany email: cdenker@aip.de
Alexandra Tritschler
Affiliation:
National Solar Observatory/Sacramento Peak, Sunspot, NM 88349, USA email: ali@nso.edu
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Abstract

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Mini-filaments are a small-scale phenomenon of the solar chromosphere, which frequently occur across the entire disk (see e.g. Wang, Li, Denker, et al. 2000). They share a variety of characteristics with their larger-scale cousins and may serve as a proxy for more complex systems. They play an important role in the energy and mass supply to the corona. In the case of small-scale eruptive filaments, only a single, small-scale loop system is involved. Furthermore, they are supported by simple magnetic field configurations (see Livi, Wang & Martin 1985), either magnetic bipoles or well-defined multipoles, easing their theoretical description. Since mini-filaments are small (just a few tens of seconds of arc) but highly dynamic (eruptions can occur within just a few minutes), they are an ideal target for high-resolution two-dimensional spectroscopy. We present a preliminary analysis of two-dimensional Hα spectroscopic data accompanied by broad-band speckle-restored images to demonstrate that chromospheric small-scale phenomena can serve as building blocks for our understanding of solar eruptive events such as filament/prominence eruptions and even coronal mass ejections (CMEs).

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2009

References

Livi, S. H. B., Wang, J., & Martin, S. F. 1985, AuJPh 38, 855Google Scholar
Wang, J., Li, W., Denker, C., Lee, C., Wang, H., Goode, P. R., McAllister, A., & Martin, S. F. 2000, ApJ 530, 1071CrossRefGoogle Scholar