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Astronomy & Astrophysics manuscript no. 1069 June 16, 2004 (DOI: will be inserted by hand later)

Summary: Astronomy & Astrophysics manuscript no. 1069 June 16, 2004
(DOI: will be inserted by hand later)
CDS wide slit time-series of EUV coronal bright points
I. Ugarte-Urra1, J.G. Doyle1, V.M. Nakariakov2, and C.R. Foley3
Armagh Observatory, College Hill, Armagh BT61 9DG, N. Ireland
Physics Department, University of Warwick, Coventry, CV4 7AL, UK
Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, Surrey RH5 6NT, UK
Received / Accepted
Abstract. Wide slit (90 240 ) movies of four Extreme Ultraviolet coronal bright points (BPs) obtained with the Coronal
Diagnostic Spectrometer (CDS) on board the Solar and Heliospheric Observatory (SoHO) have been inspected. The wavelet
analysis of the He I 584.34 , O V 629.73 and Mg VII/IX 368 time-series confirms the oscillating nature of the BPs, with
periods ranging between 600 and 1100 seconds. In one case we detect periods as short as 236 seconds. We suggest that these
oscillations are the same as those seen in the chromospheric network and that a fraction of the network bright points are most
likely the cool footpoints of the loops comprising coronal bright points. These oscillations are interpreted in terms of global
acoustic modes of the closed magnetic structures associated with BPs.
Key words. Sun: oscillations Sun: corona Sun: transition region Sun: chromosphere Sun: UV radiation Sun: magnetic


Source: Armagh Observatory


Collections: Physics