The statistical and numerical study of the global distribution of coronal plasma and magnetic field near 2.5 Rs over a 10-year period |
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| Authors: | Fang Shen Xueshang Feng Changqing Xiang Wenbin Song |
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| Institution: | 1. Department of Physics, H.R. Institute of Technology, Ghaziabad 201003, India;2. Astrophysics Research Group, Meerut College, Meerut 250002, India;3. Uttarakhand Space Application Centre, Dehradun 248006, India;4. Department of Physics, MM College, Modinagar, Ghaziabad 201204, India |
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| Abstract: | The basic characteristics of the global distribution for the corona plasma and magnetic field near 2.5 Rs are analyzed with the statistical and numerical methods for 136 Carrington Rotations (CRs) covering four different phases of solar activity. By using the observational data and the velocity distribution model in the corona, the statistical average distribution of the magnetic field, density and the coronal mass outputs are analyzed for the four different phases. Then, a numerical study of the global distribution near 2.5 Rs has been made by solving a self-consistent MHD system. Finally, the solar wind speed at 1 AU is given by mapping the speed at 2.5 Rs to that near 1 AU, and the comparison of the numerical results with the observational measurements and the simulation result of the Wang–Sheeley–Arge (WSA) model are made during more than 5 years. The numerical results indicate that the global distributions on the source surface of 2.5 Rs at different phases of solar activity could be used to predict the change of the solar wind in interplanetary space. |
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