Evidence for wave harmonics in cool loops
作者： E. O'Shea , A. K. Srivastava , J. G. Doyle , D. Banerjee
DOI: 10.1051/0004-6361:20078122
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摘要: Aims. Using temporal series image data from the Coronal Diagnostic Spectrometer (CDS) on SOHO, we study oscillations found in intensity (radiance) measurements transition region O v 629 line with aim of finding evidence wave harmonics cool loops. Methods. standard Fourier techniques, together a pre-whitening method, measure all statistically significant frequencies present flaring active loops at temperature O v. By measuring distances travelled by three Propagating Disturbances (PDs), estimates their propagation speeds are calculated. Results. Evidence is for measured suggesting presence standing waves We find that PDs have sub-sonic velocities between 12–24 km s -1 , they moved either slow mode (acoustic or magnetoacoustic) bulk flows along triggered also produces PDs. Conclusions. This comes form showing harmonic match those expected fast kink waves.
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