| Issue |
A&A
Volume 380, Number 2, December III 2001
|
|
|---|---|---|
| Page(s) | L39 - L42 | |
| Section | Letters | |
| DOI | https://doi.org/10.1051/0004-6361:20011548 | |
| Published online | 15 December 2001 | |
Signatures of very long period waves in the polar coronal holes
1
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: eoshea@so.estec.esa.nl
3
Armagh Observatory, College Hill, Armagh BT61 9DG, N. Ireland e-mail: jgd@star.arm.ac.uk
Corresponding author: D. Banerjee, dipu@wis.kuleuven.ac.be
Received:
17
September
2001
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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