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

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

Research output: Contribution to journalConference articlepeer-review


We present the analysis and results of GIS (Grazing Incidence Spectrometer) time series observed on 19th July 2003 at the boundary between the quiet Sun and an active region, close to a sunspot. The velocity map of NIS/CDS O v 629 Å shows two pairs of red and blue shifts surrounding the brightest region. Presumably, we have observed coronal loops with opposite flow velocities. Although our observations were not taken directly at the sunspot, the 3-min oscillations are seen in several coronal spectral lines. Thus the coronal loops can have some connection with the sunspot, in the vicinity. We report here of oscillations in these coronal loops as observed with coronal lines formed around 1 MK or higher. Furthermore, the oscillations form wavepackets and are intermittent with no obvious decay. The average time scale of the intermittence is of the order of 20 minutes.

Original languageEnglish
Pages (from-to)416-421
Number of pages6
JournalEuropean Space Agency, (Special Publication) ESA SP
Issue number575
StatePublished - 2004
EventSOHO 15 Workshop: Coronal Heating - , United Kingdom
Duration: 6 Sep 20049 Sep 2004


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