“…Based on the Hinode observation, Tsuneta (2009) estimated the lifetime of the elements to be within 10 to 15 h. Thus, it is useful to give a statistical measurement of the lifetime of the magnetic field elements on the polar regions. The solar rotation rate at high latitude has also been measured using various methods, such as spectroscopic (e.g., Howard and Harvey, 1970;Becker, 1978), image cross-correlation (e.g., Cram, Durney, and Guenther, 1983;Snodgrass, 1983;Strous and Simon, 1998;Meunier, 2005), and element tracking (e.g., Howard, 1978;Zhang, Zirin, and Marquette, 1997;Deng, Wang, and Harvey, 1999;Benevolenskaya, 2007). In this paper, we measure the magnetic field element lifetime and rotation rate at high latitude.…”