Active region AR484 tracking with Solar Feature Catalogue.
In: Obara, T, (ed.)
SPACE WEATHER PREDICTION: APPLICATIONS AND VALIDATION.
(pp. 1152 - 1162).
ELSEVIER SCIENCE LTD
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.
|Title:||Active region AR484 tracking with Solar Feature Catalogue|
|Event:||35th COSPAR Scientific Assembly|
|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
UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Space and Climate Physics
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