Effects of coronal mass ejection orientation on its propagation in the heliosphere
Effects of coronal mass ejection orientation on its propagation in the heliosphere
复制标题
日冕物质抛射方向对其在日光层传播的影响
DOI：
10.1051/0004-6361/202346858
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发表时间：
2023
影响因子：
6.5
通讯作者：
Temmer, M.
中科院分区：
文献类型：
--
作者：
Martinić, K.;Dumbović, M.;Čalogović, J.;Vršnak, B.;Al-Haddad, N.;Temmer, M.
在空间天气预报的范围内，能够更可靠地预测日冕物质抛射（CME）的到达时间、速度和磁场结构至关重要。从CME发射开始，影响上述所有因素的主导因素是行星际CME（ICME）与环境等离子体和行星际磁场的相互作用。AimsDue to a general anisotropic heliosphere，different oriented ICME may differently interact with the ambient plasma and interplanetary magnetic field.AimsDue to a general anisotropic heliosphere，即使初始喷发条件相似，不同取向的ICME也可能与环境等离子体和行星际磁场发生不同的相互作用。为此，我们研究了ICME的方向和它在日光层中的传播（最多1 Au）之间可能存在的联系。MethodsWe调查了31 CME-ICME协会在1997年至2018年期间。使用适用于SOHO/LASCO C2和C3日冕仪的单航天器数据的椭圆拟合技术，确定了近太阳环境中的日冕物质抛射方向。在近地环境中，我们得到了相应的ICME的定向使用原位等离子体和磁场数据。研究了不同取向ICME的激波取向和鞘区非径向流动。此外，我们还计算了ICME到地球的渡越时间和阻力参数，以探讨不同取向ICME的总体阻力。阻力参数的计算使用的逆向建模程序与拖动为基础的model.ResultsWe发现了一个显着的差异，在非径向流不同取向的ICMEs，而不同取向的ICMEs阻力的显着差异没有发现。
ContextIn the scope of space weather forecasting, it is crucial to be able to more reliably predict the arrival time, speed, and magnetic field configuration of coronal mass ejections (CMEs). From the time a CME is launched, the dominant factor influencing all of the above is the interaction of the interplanetary CME (ICME) with the ambient plasma and interplanetary magnetic field.AimsDue to a generally anisotropic heliosphere, differently oriented ICMEs may interact differently with the ambient plasma and interplanetary magnetic field, even when the initial eruption conditions are similar. For this, we examined the possible link between the orientation of an ICME and its propagation in the heliosphere (up to 1 AU).MethodsWe investigated 31 CME-ICME associations in the period from 1997 to 2018. The CME orientation in the near-Sun environment was determined using an ellipse-fitting technique applied to single-spacecraft data from SOHO/LASCO C2 and C3 coronagraphs. In the near-Earth environment, we obtained the orientation of the corresponding ICME using in situ plasma and magnetic field data. The shock orientation and nonradial flows in the sheath region for differently oriented ICMEs were investigated. In addition, we calculated the ICME transit time to Earth and drag parameter to probe the overall drag force for differently oriented ICMEs. The drag parameter was calculated using the reverse modeling procedure with the drag-based model.ResultsWe found a significant difference in nonradial flows for differently oriented ICMEs, whereas a significant difference in drag for differently oriented ICMEs was not found.