Summary: A&A 377, 691--700 (2001)
DOI: 10.1051/0004­6361:20011153
c
# ESO 2001
Astronomy
&
Astrophysics
Long period oscillations in the inter­plume regions of the Sun
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, 2201 AZ Noordwijk, The Netherlands
3 Armagh Observatory, College Hill, Armagh BT61 9DG, N. Ireland
e­mail: eoshea@so.estec.esa.nl; jgd@star.arm.ac.uk
Received 7 March 2001 / Accepted 14 August 2001
Abstract. We examine long spectral time series of inter­plume lanes observed on the 14th and 15th March 2000
with the Coronal Diagnostic Spectrometer (CDS) on­board SoHO. The observations were obtained in lines over
a wide temperature range, from the chromosphere to the corona. The statistical significance of the oscillations
was estimated by using a randomisation method. Our observations indicate the presence of compressional waves
with periods of 20--50 min or longer, both o#­limb and on­disk and up to 70 min further out to at least 25 arcsec
o#­limb. To our knowledge this is the first time that long period oscillations in the inter­plume regions close to the

Source: Armagh Observatory

Collections: Physics