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LONG PERIOD OSCILLATIONS IN POLAR PLUMES AS OBSERVED BY CDS ON SoHO
 

Summary: LONG PERIOD OSCILLATIONS IN POLAR
PLUMES AS OBSERVED BY CDS ON SoHO
D. BANERJEE 1;2 , E. O'SHEA 3 and J.G. DOYLE 1
1 Armagh Observatory, College Hill, Armagh BT61 9DG, N. Ireland
2 Centre for Plasma Astrophysics, Katholieke Universiteit Leuven, Celestijnenlaan
200B, 3001 Heverlee, Belgium
3 Dept. of Pure & Applied Physics, Queens University Belfast, BT7 1NN, N.Ireland
dipu@wis.kuleuven.ac.be, E.Oshea@qub.ac.uk, jgd@star.arm.ac.uk
(Received ..... ; Accepted in final form .....)
Abstract.
We examine spectral time series of the transition region line O v 629 š A, observed
with the Coronal Diagnostic Spectrometer (CDS) on the SoHO spacecraft in July
1997. Both Fourier and wavelet transforms have been applied independently to the
analysis of plume oscillations in order to find the most reliable periods. The wavelet
analysis allows us to derive the duration as well as the periods of the oscillations.
Our observations indicate the presence of compressional waves with periods of 10­25
minutes. We have also detected a 11 \Sigma 1 minute periodicity in the network regions of
the north polar coronal hole. The waves are produced in short bursts with coherence
times of about 30 minutes. We interpret these oscillations as outward propagating
slow magneto­acoustic waves, which may contribute significantly to the heating of

  

Source: Armagh Observatory

 

Collections: Physics