论文标题
地球状态对CME进化的影响
Effect of the Heliospheric State on CME Evolution
论文作者
论文摘要
到2019年底，太阳周期24的高潮创造了机会，比较了两个整个太阳能周期之间的冠状质量弹出（CME）的不同特性：太阳周期23（SC 23）和太阳周期24（SC 24）。我们报告了SC 23和24中肢体CME的宽度演变，以测试Gopalswamy等人的建议。 （2015a）CME通量绳索在SC 24中达到较大的地中心距离的压力平衡。我们在大量的肢体CME（〜1000）中测量CME宽度作为HeliePentric距离的函数，并确定CMES在每个周期中达到常数恒定宽度的距离。我们引入了一个新参数：CME的过渡高度（HC），该参数定义为临界地中心距离，其中CME宽度稳定在准稳定值中。循环和相位比较基于此新参数。我们发现，与SC 23中的HC相比，SC 24中HC的平均值比SC 23中的平均值高62％。与SC 23 CME相比，SC 24 CMES在离太阳较大的距离时达到了其峰值宽度。 SC 24中的增强过渡高度是对异常扩张的新观察批准。由Heliosphere弱状态引起的SC 24 CME的异常膨胀是较大的HeliePentric距离，在这种距离中，CME通量绳和环境培养基之间的压力平衡得以实现。
The culmination of solar cycle 24 by the end of 2019 has created the opportunity to compare the differing properties of coronal mass ejections (CMEs) between two whole solar cycles: Solar cycle 23 (SC 23) and Solar cycle 24 (SC 24). We report on the width evolution of limb CMEs in SC 23 and 24 in order to test the suggestion by Gopalswamy et al. (2015a) that CME flux ropes attain pressure balance at larger heliocentric distances in SC 24. We measure CME width as a function of heliocentric distance for a significantly large number of limb CMEs (~1000) and determine the distances where the CMEs reach constant width in each cycle. We introduced a new parameter: the transition height (hc) of a CME defined as the critical heliocentric distance beyond which the CME width stabilizes to a quasi-constant value. Cycle and phase-to-phase comparisons are based on this new parameter. We find that the average value of hc in SC 24 is 62% higher than in SC 23. SC 24 CMEs attain their peak width at larger distances from the Sun as compared to SC 23 CMEs. The enhanced transition height in SC 24 is new observational ratification of the anomalous expansion. The anomalous expansion of SC 24 CMEs which is caused by the weak state of the heliosphere, accounts for the larger heliocentric distance where the pressure balance between CME flux rope and the ambient medium is attained.
