Extended Data Fig. 2: Two additional individual examples of torsional Alfvén motions.
From: Evidence for small-scale torsional Alfvén waves in the solar corona
Panel a (g) shows a small region of the peak line intensity focusing on an individual brightness enhancement corresponding to an over dense coronal magnetic flux tube. The thick dashed line (middle) represents the measured centre of the structure as a function of time, the two fainter dashed lines either side represent the two edges of flux tube (Edge U. and Edge L.). Panel b (h) shows the residual Doppler velocity after subtracting the Doppler velocity measured at the centre of the flux tube. Panel c (i) indicates the mean-subtracted Edge U. (solid) and Edge L. (dashed signals) residual Doppler signals, while panels d–f (j–l) show the corresponding Intrinsic Mode Functions (IMF) derived from Empirical mode decomposition.
