论文标题
LASCO视野中的冠状质量驱散运动学
Kinematics of coronal mass ejections in the LASCO field of view
论文作者
论文摘要
在本文中，我们介绍了从1996年至2017年中期到达1996年至2017年中的太阳能和地球层观测器上的28894冠状质量弹出（CME）的运动学研究。初始加速阶段的特征是在内部电晕爆发后CME速度迅速增加。此阶段之后是不重要的残留加速度（减速），其特征是CME的速度几乎恒定。我们证明初始加速度在0.24-2616 MS-2范围内，中位值（平均）值为57 ms-2（34 ms-2），并且最高为约28个太阳半径，中位数（平均）值为7.8太阳半径（6太阳半径）。此外，在快速CME（v> 900 kms-1）的情况下，初始加速度显着，其中中位数（平均）值分别约为295 ms-2（251 ms-2），并且在慢速CME（v <250 kmms-1）的情况下，中值（平均值（平均）值分别约为18 ms-2（17 ms-2），则弱得多。我们注意到，在传播的前2个小时，显着的驱动力（Lorentz Force）可以距离太阳6太阳半径高达6个太阳半径。我们发现初始加速度幅度和加速持续时间之间存在显着的抗相关性，而剩余加速度覆盖范围为-1224至0 ms-2，中位数（平均）值为-34 ms-2（-17 ms-2）。一个有趣的发现是，与太阳活性的第23周期相比，在第24周期中，残余加速度要小得多。我们的研究还表明，所考虑的参数，初始加速度（ACC INI），剩余加速度（ACC RES），最大速度（V max）以及最大速度（时间最大）的时间主要遵循太阳周期和个体周期的强度。
In this paper we present a statistical study of the kinematics of 28894 coronal mass ejections (CMEs) recorded by the Large Angle and Spectrometric Coronagraph (LASCO) on board the Solar and Heliospheric Observatory spacecraft from 1996 until mid-2017. The initial acceleration phase is characterized by a rapid increase in CME velocity just after eruption in the inner corona. This phase is followed by a non-significant residual acceleration (deceleration) characterized by an almost constant speed of CMEs. We demonstrate that the initial acceleration is in the range 0.24-2616 ms-2 with median (average) value of 57 ms-2 (34 ms-2 ) and it takes place up to a distance of about 28 solar radius with median (average) value of 7.8 solar radius (6 solar radius). Additionally, the initial acceleration is significant in the case of fast CMEs (V > 900 kms-1 ), where the median (average) values are about 295 ms-2 (251 ms-2 ), respectively, and much weaker in the case of slow CMEs (V < 250 kms-1 ), where the median (average) values are about 18 ms-2 (17 ms-2 ), respectively. We note that the significant driving force (Lorentz force) can operate up to a distance of 6 solar radius from the Sun during the first 2 hours of propagation. We found a significant anti-correlation between the initial acceleration magnitude and the acceleration duration, whereas the residual acceleration covers a range from -1224 to 0 ms-2 with a median (average) value of -34 ms-2 (-17 ms-2 ). One intriguing finding is that the residual acceleration is much smaller during the 24th cycle in comparison to the 23rd cycle of solar activity. Our study has also revealed that the considered parameters, initial acceleration (ACC INI ), residual acceleration (ACC RES ), maximum velocity (V MAX ), and time at maximum velocity (Time MAX ) mostly follow solar cycles and the intensities of the individual cycle.
