Journal
ASTRONOMY & ASTROPHYSICS
Volume 489, Issue 3, Pages L49-L52Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361:200810263
Keywords
techniques : spectroscopic; Sun : corona; Sun : oscillations; line : profiles; magnetohydrodynamics (MHD)
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Funding
- NSF, Hungary [OTKA, K67746]
- STFC
- Science and Technology Facilities Council [PP/D002907/1] Funding Source: researchfish
- STFC [PP/D002907/1] Funding Source: UKRI
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Context. Waves offer a unique opportunity to understand and diagnose the properties of the solar coronal plasma. Aims. Hinode/EIS observations are analysed to detect wave and oscillatory motions in the solar corona. Methods. The EIS observations were carried out using a selection of EUV lines. Hinode/XRT images are taken concurrently. 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.
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