Coronal mass ejections acceleration problem |
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Authors: | Yayuan Wen Jingxiu Wang Hui Zhao Dalmiro Jorge Filipe Maia |
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Institution: | 1. National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China;2. CICGE, Observatório Astronómico Professor Manuel de Barros, Faculdade de Ciências da Universidade do Porto, 4430-146 Vila Nova de Gaia, Portugal |
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Abstract: | A statistical study of acceleration and its error of coronal mass ejections (CMEs) observed by the Large Angle Spectrometric Coronagraph (LASCO) is performed. A total of 5594 CMEs events have been analyzed by using a least-square method and using the error in the height measures. We verify that slower CMEs (velocities in the interval from 200 to 500 km s−1) tend to have a positive acceleration (about 1 m s−2) at heights above 5 solar radii, while less than 10% CMEs show an average negative acceleration (about −2.2 m s−2) as they propagate from 5 to 30 solar radii. For most individual CMEs one can not say if they are accelerated or decelerated, only for 8% of all observed CMEs events one can extract the sign of the acceleration in the 5–30 solar radii. |
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Keywords: | Coronal mass ejections Error estimates Acceleration |
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