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Long Period Oscillations in Polar Plumes as Observed by CDS on SoHO

Published online by Cambridge University Press:  13 May 2016

D. Banerjee ,
E. O'shea ,
J. G. Doyle  and
M. Goossens
D. Banerjee
Affiliation:
Centre for Plasma Astrophysics, Katholieke Universiteit Leuven, Celestijnenlaan 200B, 3001 Heverlee, Belgium
E. O'shea
Affiliation:
ESA/ESTEC, Solar System Division, Keplerlaan 1, NL-2201 AZ, Noordwijk, The Netherlands
J. G. Doyle
Affiliation:
Armagh Observatory, College Hill, Armagh BT61 9DG, N. Ireland
M. Goossens
Affiliation:
Centre for Plasma Astrophysics, Katholieke Universiteit Leuven, Celestijnenlaan 200B, 3001 Heverlee, Belgium

Abstract

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We examine time series of the transition region spectral line O v 629 Å, observed with the Coronal Diagnostic Spectrometer (CDS) onboard the SoHO spacecraft. Primarily we were looking for intensity and velocity oscillations in polar plumes, however by chance we detected a giant macro-spicule at the limb and were able to follow its dynamical structure. We have reported the dynamics of the giant macro-spicule in Banerjee et al. (2000a) and have also reported the existence of long period oscillations in the polar plumes as observed in the O v 629 Å line in Banerjee et al. (2000a,b). In this short contribution we revisit one of these dataset, namely s16834r01 to test the reliability of the observed periods. The statistical significance of the oscillations is estimated by using a randomisation method. Our analysis re-confirms the presence of compressional waves with periods of 20-25 minutes.

Type
Session III: Active Region Structure and Dynamics
Information
Symposium - International Astronomical Union , Volume 203: Recent Insights into the Physics of the Sun and Heliosphere: Highlights from Soho and Other Space Missions , 2001 , pp. 244 - 246
Copyright
Copyright © Astronomical Society of the Pacific 2001 

References

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