Abstract
A high-quality 80-minute time series of a part of a sunspots moat (18 ″ × 23 ″) in the G-band (4308.64 Å) has been analysed to measure the horizontal velocities of Magnetic Bright Points (MBPs). The observations were carried out in June 2004 at the new 1-meter Swedish Solar Telescope in La Palma. Spatial resolution was estimated to be 0.17 ″ or 125 km on the Sun, and images were taken in a frame selection mode in a 20-seconds interval. Individual feature tracking of MBPs with manual selection and automated tracking has been performed. The intensity of MBPs increases with size. The mean value in a MBP-velocity histogram was found to be 1.11 km s −1 and it shows good accordance with an abnormal granulation-velocity histogram. MBP velocity histograms as presented here can be taken as an input for coronal heating models in an active region. However, MBPs move slower in an active region than in the network (presumably because of the higher active region magnetic flux) and hence, a process that includes dissipation of MHD waves through fast MBP motions (>2 km s −1) may not alone explain the observed properties of the corona.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Berger, T.E. and Title, A.M.: 1996, Astrophys. J. 463, 365.
Berger, T.E. and Title, A.M.: 2001, Astrophys. J. 553, 449.
Berger, T.E., Löfdahl, M.G., Shine, R.S., and Title, A.M.: 1998, Astrophys. J. 495, 973.
Berger, T.E., Rouppe van der Voort, L.H.M., Löfdahl, M.G., Carlsson, M., Fossum, A., Hansteen, V.H., Marthinussen, E., Title, A., and Scharmer, G.: 2004, Astron. Astrophys. 428, 613.
Bovelet, B. and Wiehr, E.: 2003, Astron. Astrophys. 412, 249.
Cattaneo, F.: 1999, Astrophys. J. 515, L39.
Choudhuri, A.R., Dikpati, M., and Banerjee, D.: 1993, Astrophys. J. 413, 811C.
Hagenaar, H.J. and Shine, R.A.: 2005, Astrophys. J. 635, 659.
Muller, R., Roudier, T., Vigneau, J., and Auffret, H.: 1994, Astron. Astrophys. 283, 232.
Nisenson, P., van Ballegooijen, A.A., de Wijn, A.G., and Sütterlin, P.: 2003, Astrophys. J. 587, 485.
November, L.J. and Simon, G.W.: 1988, Astrophys. J. 333, 427.
Rouppe van der Voort, L.H.M., Hansteen, V.H., Carlsson, M., Fossum, A., Marthinussen, E., van Noort, M.J., and Berger, T.E.: 2005, Astron. Astrophys. 435, 327.
Sanchez-Almeida, J., Landi Degl’Innocenti, E., Martinez Pillet, V., and Lites, B.W.: 1996, Astrophys. J. 466, 537.
Scharmer, G.B., Bjelksjö, K., Korhonen, T., Lindberg, B., and Petterson, B.: 2003, in S. Keil and S. Avakyan (eds.), Proceedings of the SPIE, 4853, p. 47.
Stein, R.F. and Nordlund, å.: 2003, in N. Piskunov, W.W. Weiss, and D.F. Gray (eds.), ASP IAU Symposium, 210, p. 169.
Wiehr, E., Bovelet, B., and Hirzberger, J.: 2004, Astron. Astrophys. 422, L63.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Möstl, C., Hanslmeier, A., Sobotka, M. et al. Dynamics of Magnetic Bright Points in an Active Region. Sol Phys 237, 13–23 (2006). https://doi.org/10.1007/s11207-006-0131-4
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/s11207-006-0131-4