Automated Boundary-extraction And Region-growing Techniques Applied To Solar Magnetograms

We present an automated approach to active region extraction from full-disc MDI longitudinal magnetograms. This uses a region-growing technique in conjunction with boundary-extraction to define a number of enclosed contours as belonging to separate regions of magnetic significance on the solar disc. This provides an objective definition of active regions and areas of plage on the Sun. A number of parameters relating to the flare potential of each region are discussed.

[1]  Craig E. Deforest,et al.  On Re-sampling of Solar Images , 2004 .

[2]  E. Lu.  The Statistical Physics of Solar Active Regions and the Fundamental Nature of Solar Flares , 1995 .

[3]  P. Démoulin,et al.  How are Emerging Flux, Flares and CMEs Related to Magnetic Polarity Imbalance in Midi Data? , 2003, astro-ph/0304092.

[4]  Loukas Vlahos,et al.  On the Self-Similarity of Unstable Magnetic Discontinuities in Solar Active Regions , 2004 .

[5]  T. Berger,et al.  Weak-Field Magnetogram Calibration using Advanced Stokes Polarimeter Flux Density Maps – II. SOHO/MDI Full-Disk Mode Calibration , 2003 .

[6]  Philip R. Goode,et al.  Signature of an Avalanche in Solar Flares as Measured by Photospheric Magnetic Fields , 2003 .

[7]  J. Worden,et al.  Evolution of Chromospheric Structures Derived from Ca II K Spectroheliograms: Implications for Solar Ultraviolet Irradiance Variability , 1998 .

[8]  E. Bratsolis,et al.  SOLAR IMAGE SEGMENTATION BY USE OF MEAN FIELD FAST ANNEALING , 1998 .

[9]  L. M. Bugayevskiy,et al.  Map Projections: A Reference Manual , 1995 .

[10]  J. Snyder.  Flattening the Earth: Two Thousand Years of Map Projections , 1994 .

[11]  C. J. Wolfson,et al.  The Solar Oscillations Investigation - Michelson Doppler Imager , 1995 .

[12]  V. Domingo,et al.  The SOHO mission: An overview , 1995 .

[13]  Haimin Wang,et al.  Active-Region Monitoring and Flare Forecasting – I. Data Processing and First Results , 2002 .

[14]  Haimin Wang,et al.  Automatic Solar Flare Tracking Using Image-Processing Techniques , 2004 .

[15]  Valentina V. Zharkova,et al.  Technique for Automated Recognition of Sunspots on Full-Disk Solar Images , 2005, EURASIP J. Adv. Signal Process..

[16]  N. Meunier.  Fractal Analysis of Michelson Doppler Imager Magnetograms: A Contribution to the Study of the Formation of Solar Active Regions , 1999 .

[17]  A. Ruzmaikin,et al.  On the Multifractal Distribution of Solar Magnetic Fields , 1996 .

[18]  Sinh Hoa Nguyen,et al.  Learning Sunspot Classification , 2006, Fundam. Informaticae.