Context images showing the common FoV for all observations. Left panel: SoHO/MDI magnetogram at the best visibility of the emerging feature. The color scale is in Mx cm^-2 with red (blue) indicating positive (negative) polarity. An artificial saturation at ±150 Mx cm^-2 has been chosen to highlight regions of weak magnetic polarity on the solar surface. Middle panel: image taken in the TRACE white-light channel during the emergence of the analyzed feature demonstrating the absence of strong magnetic fields in the FoV (quiet Sun). Right panel: temporal average of TRACE images taken in the 1216 Å channel during the feature emergence showing long-living chromospheric network elements. Squares enclose the region enlarged in Fig. 2. (This figure is available in color in electronic form.)