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Astronomy & Astrophysics manuscript no. (will be inserted by hand later)

Summary: Astronomy & Astrophysics manuscript no.
(will be inserted by hand later)
Signatures of very long period waves in the polar coronal holes
D. Banerjee 1 , E. O'Shea 2 , J.G.Doyle 3 , and M. Goossens 1
1 Centre for Plasma Astrophysics, Katholieke Universiteit Leuven, Celestijnenlaan 200B, 3001 Heverlee, Belgium
2 ESA Space Science Dept, ESTEC Solar System Div., Keplerlaan 1, NL-2201 AZ, Noordwijk, The Netherlands
3 Armagh Observatory, College Hill, Armagh BT61 9DG, N. Ireland
emails: dipu@wis.kuleuven.ac.be; eoshea@so.estec.esa.nl; jgd@star.arm.ac.uk;
Received date, accepted date
Abstract. We examine long spectral time series of a coronal hole observed on the 7th March 2000 with the Coronal
Diagnostic Spectrometer (CDS) on-board SoHO. The observations were obtained in the chromospheric He i, and
a series of higher temperature oxygen lines. In this letter we report on the presence of long period oscillations in a
polar coronal hole region on the disk. Our observations indicate the presence of compressional waves with periods
of 20-30 minutes or longer.
Key words. Sun: Polar coronal holes -Ultraviolet: SoHO{Sun: Oscillations
1. Introduction
Coronal holes in the solar atmosphere have been identi-
ed as the source regions of the fast solar wind. Recent
observations from SUMER/SoHO have also shown that


Source: Armagh Observatory


Collections: Physics