Volume 380, Number 2, December III 2001
|Page(s)||L39 - L42|
|Published online||15 December 2001|
Signatures of very long period waves in the polar coronal holes
Centre for Plasma Astrophysics, Katholieke Universiteit Leuven, Celestijnenlaan 200B, 3001 Heverlee, Belgium e-mail: Marcel.Goossens@wis.kuleuven.ac.be
2 ESA Space Science Dept, ESTEC Solar System Div., Keplerlaan 1, 2201 AZ, Noordwijk, The Netherlands e-mail: firstname.lastname@example.org
3 Armagh Observatory, College Hill, Armagh BT61 9DG, N. Ireland e-mail: email@example.com
Corresponding author: D. Banerjee, firstname.lastname@example.org
Accepted: 8 November 2001
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 min or longer.
Key words: Sun: corona / ultraviolet: solar system / Sun: oscillations
© ESO, 2001
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