Automatic method for detection of solar coronal width using extreme ultra-violet (EUV) radiation

Abstract: Solar corona, the last main layer of the atmosphere of the Sun, is detectable in the EUV and X-ray. The corona is expanding into space up to millions of kilometers and is observable during the eclipse. The temperature is increasing about millions of Kelvin. The investigation of this layer is significant for solar physicists because it is dynamic and features. Active regions (AR) and solar mass ejections (CMEs) are the important features in the solar corona. In this research, the solar limb and coronal width is studied from full-disk images at $284 \AA$ taken by SOHO/EIT during eleven-year period (2000-2010). Next, using image processing methods and by applying region growing function, the corona is segmented and extracted from images in different angles. The radial velocities of CMEs are extracted.