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Motions and oscillations in a filament preceding its eruption

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Abstract

The Doppler motions in a filament and the underlying photosphere over the several days before its eruption are analyzed. A large filament in the northern hemisphere near the central meridian observed from August 31-September 2, 2014 erupted on September 2, 2014. The filament lost the bulk of its mass as a result of its eruption, and the process of its reconstruction had begun a day later. Observations of this filament in a spectral range encompassing the Hβ λ 486.1 nm (chromospheric) and Fe I λ 485.9 nm (photospheric) lines were carried out on the Horizontal Solar Telescope of the Sayan Solar Observatory on August 31-September 2, 2014. Analysis of the Doppler motions in and beneath the filament yielded the following results. Strong rotational motions were present in the filament over a prolonged period (the entire three days of observations). The coincidence of the steady-state motions of the photosphere and filament was disrupted at the moment of destabilization of the filament by the emergence of new magnetic flux. Short-period (about five-minute) photospheric oscillationswith a train-like character arose in filament from time to time several hours before the eruption. Large segments underwent nearly vertical oscillations in the initial phase of the ascent of the filament.

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Authors and Affiliations

  1. Institute of Solar-Terrestrial Physics, Siberian Branch, Russian Academy of Sciences, P.O. Box 291, ul. Lermontova 126a, Irkutsk, 664033, Russia

    G. P. Mashnich & V. S. Bashkirtsev

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  1. G. P. Mashnich
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  2. V. S. Bashkirtsev
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Correspondence to G. P. Mashnich.

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Original Russian Text © G.P. Mashnich, V.S. Bashkirtsev, 2016, published in Astronomicheskii Zhurnal, 2016, Vol. 93, No. 2, pp. 247-253.

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Mashnich, G.P., Bashkirtsev, V.S. Motions and oscillations in a filament preceding its eruption. Astron. Rep. 60, 287–293 (2016). https://doi.org/10.1134/S1063772916020086

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  • DOI: https://doi.org/10.1134/S1063772916020086

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