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Active region AR484 tracking with Solar Feature Catalogue

Zharkova, V; Benkhalil, A; Zharkov, S; Ipson, S; Bentley, RD; (2006) Active region AR484 tracking with Solar Feature Catalogue. In: Obara, T, (ed.) SPACE WEATHER PREDICTION: APPLICATIONS AND VALIDATION. (pp. 1152 - 1162). ELSEVIER SCIENCE LTD

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This paper presents a morphological analysis of the active region NOAA AR 484 as well as its intensity and magnetic field variations associated with flare occurrences. The active region is tracked during a one solar rotation with the automated technique used in Solar Feature Catalogue (SFC). The location and intensity parameters of region AR484 were extracted from I minute cadence Ha solar images from the Big Bear observatory (BBSO), SCIHO/EIT images in Fe XII, 195 angstrom and the SOHO/MD1 magnetograms. During the whole period of tracking from October, 19 until November, 11, 2003 the AR484 produced many flares of different significance including a few X-class flares. We investigate the total AR intensity variations in each band leading to a flare production and compare these with the magnetic field changes before and during a flare for five flares of different significance. Based on this comparison the key parameters defining the region activity in a flare production are found that include the resulting, or excess, flux and the ratio between areas covered by negative and positive pixels. These parameters can be used for a preliminary pre-flare classification of active regions in addition to other classifiers associated with a magnetic field. (c) 2005 COSPAR. Published by Elsevier Ltd. All rights reserved.

Type:Proceedings paper
Title:Active region AR484 tracking with Solar Feature Catalogue
Event:35th COSPAR Scientific Assembly
Location:Paris, FRANCE
Dates:2004-07-18 - 2004-07-25
Keywords:active regions, flares, Solar Feature Catalogue, morphological analysis, image processing, automated detection, IMAGE STANDARDIZATION, MAGNETIC-FIELD, FLARES, SHEAR
UCL classification:UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Space and Climate Physics

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