Coronal Periodmaps |
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Authors: | V M Nakariakov D B King |
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Institution: | (1) Physics Department, University of Warwick, Coventry, CV4 7AL, UK |
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Abstract: | The search for signatures of wave and oscillatory processes in the solar corona in the data obtained with imaging instruments
can be automated by using the periodmap method. The method reduces a three-dimensional data cube to a two-dimensional map
of the analysed field of view. The map reveals the presence and distribution of the most pronounced frequencies in the power
spectrum of the time signal recorded at spatial pixels. We demonstrate the applicability of this method as a pre-analysis
tool with the use of TRACE EUV coronal data, which contain examples of transverse and longitudinal oscillations of coronal
loops. The main advantage of using periodmaps over other possible (more sophisticated) pre-analysis tools, such as wavelet
analysis, is their robustness and efficiency (both in speed and computational power). The method can be implemented in the
Hinode/XRT and SDO/AIA data pre-analysis. |
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Keywords: | Coronal oscillations Coronal waves MHD waves EUV |
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