The solar active region No. 10486 and its production of high energetic flares at October-November 2003

摘要

The solar active region No, 10486 can be considered as one of the very large and powerful active regions since 1976 This region has produced the most important two solar flares during the period (1976-2003). The first flare released at 12:15UT on 28 October 2003 with importance X17/4B, and the second flare released at 22:25UT on 4 November 2003 with importance X28/3B Both flares are the highest level in x-ray production since 1976, when different detectors, onboard various spacecrafts, have taken the data, and since 1996, when SOHO was launched to space. The first flare on 28 October 2003 produced protons events at 6:15UT on 29 Oct.. 2003 with energies >10 MeV, The maximum solar wind speed is 1905 and 1986 km/sec at 29 and 30 October 2003 respectively The same region after its rotation across the sun was appeared again on the sun's edge at 18 November 2003, and produced high energetic flare at 19 November 2003, which led to increase the solar wind speed to 947 km/sec at 20 November 2003 The evaluation of the active region No. 10486 is very important for understanding the high energetic proton flares. The aim of this study is to follow the morphological and magnetic changes of the active region before, during, and after the high energetic flares were produced Also, applying the cumulative summation curves method for the different index of the active region to predict the flare of high energy has been carried out The results are promising and can be used for proton flares and Geomagnetic storms prediction, few days before their occurrence.