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Excitation of kink oscillations of coronal loops: statistical study View all abstracts by submitter

Valery Nakariakov   Submitted: 2014-12-18 10:01

Context. Solar flares are often accompanied by kink (transverse) oscillations of coronal loops. Despite intensive study of these oscillations in recent years mechanisms for their excitation remain unrevealed. Aims. To clarify the excitation mechanisms for kink oscillations of coronal loops. Methods. We analyse 58 kink oscillation events observed by the Atmospheric Imaging Assembly (AIA) onboard the Solar Dynamics Observatory (SDO) during its first four years (2010-2014) with the use of the JHelioviewer. Association of these oscillation events with flares, lower coronal eruptions and plasma ejections, coronal mass ejections (CMEs) and coronal type II radio bursts is studied. Results. It is found that 44 out of these 58 oscillation events (76%) were associated with CMEs observed in the white light emission. Moreover, 57 events (98%) were accompanied by lower coronal eruptions/ejections (LCEs) observed in the EUV band in the parental active regions. An LCE was not clearly seen only in one event but it was definitely associated with a CME. The main observational finding is that the kink oscillations were excited by the deviation of loops from their equilibria by a nearby LCEs in 55 events (95%). In 3 remaining events it was difficult to reliably determine the cause of the oscillations because of limitations of the observational data. We also found that 53 events (91%) were associated with flares. In five remaining events the parental active regions were behind the limb and we could not directly see flare sites. It indicates that there is a close relationship between these two kinds of the solar activity. However, the estimated speeds of a hypothetical driver of kink oscillations by flares were found to be low than 500 km s-1 in 80% of cases. Such low speeds are not in favour of the association of the oscillation excitation with a shock wave, as it has usually been assumed. The fact that only 23 (40%) of the oscillation events were found to be associated with coronal type II radio bursts is also against the shock wave mechanism for the excitation of kink oscillations. Conclusions. The performed statistical analysis shows that the most probable mechanism for the excitation of kink oscillations of coronal loops is the deviation of loops from their equilibrium by nearby eruptions or plasma ejections rather than a blast shock wave ignited by a flare.

Authors: Zimovets, I.V., Nakariakov, V.M.
Projects: SDO-AIA

Publication Status: A&A, accepted
Last Modified: 2014-12-21 19:18
Go to main E-Print page  MHD Seismology of a Coronal Loop System by the First Two Modes of Standing Kink Waves  Multi-mode quasi-periodic pulsations in a solar flare  Edit Entry  Download Preprint  Submitter's Homepage Delete Entry 

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