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Fig. 5


Evolution of a) the intensity contrast, b) horizontal velocity, c) diameter, d) CP, a measure of the strength of Stokes V, e) total net linear polarisation LP, and f) field strength of the selected BP shown in Figs. 1 and 4. CP and LP are normalised to Stokes I continuum. In panels a) and f), the thin curves respectively represent the time variation of average intensity and the unsigned longitudinal magnetic field within the BP while the smoothed thick lines (red in online version) show a 5-frames boxcar average. The intensities are both normalised to the mean intensity of the image. The (blue) dashed curve in panel a) represents the smoothed average intensity within the BP, in arbitrary unit, from the restored images (see main text). Evolution of horizontal velocity, smoothed within 5 frames by weighted averaging, is plotted as the thick line (red in the online version) in panel b) while the thin vertical solid lines indicate the error bars. The vertical dashed lines in the two upper panels serve to guide the eye to the general anti-correlation between intensity and horizontal velocity (see main text). The 3σ noise levels for both CP and LP, are drawn as dashed-lines in panels d) and e), while the dotted and dot-dashed lines in panel e) are the 2σ and 1σ noise levels, respectively. The unsigned longitudinal magnetic field depicted in panel f) was computed from the SIR inversions (see main text).

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