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

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

研究成果: 雜誌貢獻會議論文同行評審


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.

頁(從 - 到)416-421
期刊European Space Agency, (Special Publication) ESA SP
出版狀態已出版 - 2004
事件SOHO 15 Workshop: Coronal Heating - , United Kingdom
持續時間: 6 9月 20049 9月 2004


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