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Solar Physics

, Volume 291, Issue 11, pp 3251–3267 | Cite as

Motion Magnification in Coronal Seismology

  • Sergey Anfinogentov
  • Valery M. Nakariakov
Waves in the Solar Corona

Abstract

We introduce a new method for the investigation of low-amplitude transverse oscillations of solar plasma non-uniformities, such as coronal loops, individual strands in coronal arcades, jets, prominence fibrils, polar plumes, and other contrast features that have been observed with imaging instruments. The method is based on the two-dimensional dual-tree complex wavelet transform (DTℂWT). It allows us to magnify transverse, in the plane-of-the-sky, quasi-periodic motions of contrast features in image sequences. The tests performed on the artificial data cubes that imitated exponentially decaying, multi-periodic and frequency-modulated kink oscillations of coronal loops showed the effectiveness, reliability, and robustness of this technique. The algorithm was found to give linear scaling of the magnified amplitudes with the original amplitudes, provided these are sufficiently small. In addition, the magnification is independent of the oscillation period in a broad range of the periods. The application of this technique to SDO/AIA EUV data cubes of a non-flaring active region allowed for the improved detection of low-amplitude decay-less oscillations in the majority of loops.

Keywords

Coronal seismology Data processing Motion magnification Solar atmosphere Oscillations Observations Waves Coronal loops 

Notes

Acknowledgements

This work was supported by the European Research Council under the research project No. 321141 SeismoSun. The algorithm is based on the Python code implementing DTℂWT, https://github.com/rjw57/dtcwt , developed by Richard Wareham.

Disclosure of Potential Conflicts of Interest

The authors declare that they have no conflicts of interest.

Supplementary material

11207_2016_1013_MOESM1_ESM.mp4 (2.1 mb)
(MP4 2.1 MB)
11207_2016_1013_MOESM2_ESM.mp4 (11.7 mb)
(MP4 11.7 MB)

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Copyright information

© Springer Science+Business Media Dordrecht 2016

Authors and Affiliations

  1. 1.Centre for Fusion, Space and Astrophysics, Department of PhysicsUniversity of WarwickCoventryUK

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