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Hinode EUV spectroscopic observations of coronal oscillations

By R. Erdelyi and Y. Taroyan


Context. Waves offer a unique opportunity to understand and diagnose the properties of the solar coronal plasma.\ud Aims. Hinode/EIS observations are analysed to detect wave and oscillatory motions in the solar corona.\ud Methods. The EIS observations were carried out using a selection of EUV lines. Hinode/XRT images are taken concurrently.\ud Results. Two examples of oscillations in active regions are presented. We analysed the evolution of the intensities and Doppler shifts. The Hinode/XRT images suggest that both events occurred along loop-like structures. The first event is interpreted as a slow sausage (acoustic) type wave with a period of 1.2 mHz. The second example is associated with a transverse, most likely kink type, wave with a period of 3 mHz. The EUV line ratios were then used to determine the value of the coronal magnetic field

Publisher: EDP Sciences
Year: 2008
OAI identifier:

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