Light curves of the sunspot, jet and its footpoint: a) 211 Å light curves with 12 s time cadence of the footpoint, sunspot, and jet; b) 211 Å jet, footpoint, and radio light curves averaged over 1 min; c) cross-correlation between footpoint and the jet (blue) and the footpoint and sunspot (black) over the 2.5 h period; d) cross-correlation between the footpoint and sunspot during two jet intensive periods as indicated by the solid and dashed red lines in a). e) Cross-correlation of the jet (blue) and footpoint (red) with the radio.