Hinode EUV spectroscopic observations of coronal oscillations

Details Hinode EUV spectroscopic observations of coronal oscillations Hinode EUV spectroscopic observations of coronal oscillations

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008a%26a...489l..49e&link_type=abstract

Astronomy and Astrophysics, Volume 489, Issue 3, 2008, pp.L49-L52

Astronomy and Astrophysics

Astrophysics

32

Techniques: Spectroscopic, Sun: Corona, Sun: Oscillations, Line: Profiles, Magnetohydrodynamics (Mhd)

Scientific paper

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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