Mass Determination of Coronal Mass Ejection by Thomson Equations

Abstract

One of the main sources of calculating the mass of coronal mass ejections (CME) is the use of Large Angle and Spectrometric Coronagraph (LASCO) detectors onboard Solar and Helioshperic Observatory (SOHO) images and using Thomson Scattering of white light from the outer edge of the CME plasma. Thomson Scattering of white light from the outer edge of the CME have also been used in set of equations in this paper, to describe light scattering from the outer edge of the CME. These equations depend on many functions, each of which is described by the angular dependence between the Sun-Earth line of sight. First, the angular parameters were calculated and then the final mass dependence on angle was numerically estimated using a MATLAB code. The results showed that a similar dependence of few functions on the angles and the distance of the CME outer edge from center of the Sun. A comparison was made for two distances, the conclusion was when that distance increases the mass distribution decreases.