Hinode EUV spectroscopic observations of coronal oscillations

R. Erdélyi, Youra Taroyan

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Abstract

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.
Original languageEnglish
Pages (from-to)L49-L52
JournalAstronomy and Astrophysics
Volume489
Issue number3
DOIs
Publication statusPublished - 03 Oct 2008

Keywords

  • techniques: spectroscopic
  • Sun: corona
  • Sun: oscillations
  • line: profiles
  • magnetohydrodynamics (MHD)

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