کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1767643 | 1020199 | 2008 | 6 صفحه PDF | دانلود رایگان |
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.
Journal: Advances in Space Research - Volume 42, Issue 5, 1 September 2008, Pages 852–857