Coronal oscillations in the vicinity of a sunspot as observed by GIS/CDS

C. H. Lin, D. Banerjee, J. G. Doyle, E. O'Shea, C. R. Foley

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


In this paper, we present results from a time series analysis of data from the Grazing Incidence Spectrometer (GIS), onboard SoHO. Our observations were concentrated at the boundary between the quiet Sun and an active region, close to a sunspot plume. The dominant oscillations in all the lines studied are of periods longer than 5 min. Although our observations were not taken directly above the sunspot, the 3-min oscillations, which are normally associated with the umbra, are seen in several spectral lines, suggesting some leakage perhaps via plume structures. The oscillations of coronal lines form wavepackets, and are intermittent with no obvious decay. The average time scale of the intermittence is of the order of 20 min, which would correspond to a source size of 2 arcsec.

Original languageEnglish
Pages (from-to)751-759
Number of pages9
JournalAstronomy and Astrophysics
Issue number2
StatePublished - May 2005


  • Sun: corona
  • Waves


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