Tree Based Decomposition of Sunspot Images

Solar sunspot rotation, latitudinal bands are studied based on intelligent computation methods. A combination of image fusion method with together tree decomposition is used to obtain quantitative values about the latitudes of trajectories on sun surface that sunspots rotate around them. Daily solar images taken with SOlar and Heliospheric (SOHO) satellite are fused for each month separately .The result of fused image is decomposed with Quad Tree decomposition method in order to achieve the precise information about latitudes of sunspot trajectories. Such analysis is useful for gathering information about the regions on sun surface and coordinates in space that is more expose to solar geomagnetic storms, tremendous flares and hot plasma gases permeate interplanetary space and help human to serve their technical systems. Here sunspot images in September, November and October in 2001 are used for studying the magnetic behavior of sun.

Authors:

• Hossein Mirzaee
• Farhad Besharati

Keywords:

• Quad tree decomposition
• sunspot image.

References:

[1] Lee, S.-S., Horng, S.-J., Tsai, H.-R., Tsai, S.-S.: Building a Quadtree and
Its Applications on a Recon_gurable Mesh. Pattern Recognition 29
(1996) 1571-1579.
[2] Julien Burlet, Olivier Aycard and Thierry Fraichard, " Robust Motion
Planning using Markov Decision Processes and Quadtree
Decomposition", Proceedings of IEEE International Conference on
Robotics & Automation, 2004.
[3] Jean-Marc Laferté, Patrick Pérez, and Fabrice Heitz, "Discrete Markov
Image Modeling and Inference on the Quadtree", IEEE Transactions On
Image Processing, Vol. 9, No: 3, March 2000.
[4] Schrijver C. J., A.M. Title, K. L. HarveyÔÇá, N. R. Sheeley Jr, Y.-M.
Wang, G. H. J. van den Oord, R. A. Shine, T. D. Tarbell & N. E.
Hurlburt, "Large-scale coronal heating by the small-scale magnetic field
of the Sun", Nature, Vol. 394, 9 July 1998.
[5] Wang Y. M, Sheeley Jr N.R, Nash A.G, "Latitudinal distribution of solar
wind speed from magnetic observational of the sun ", Nature, Vol. 347,
4 October 1990.