A STEREO Survey of Magnetic Cloud Coronal Mass Ejections Observed at Earth in 2008-2012

被引:64
作者
Wood, Brian E. [1 ]
Wu, Chin-Chun [1 ]
Lepping, Ronald P. [2 ]
Nieves-Chinchilla, Teresa [2 ,3 ]
Howard, Russell A. [1 ]
Linton, Mark G. [1 ]
Socker, Dennis G. [1 ]
机构
[1] Naval Res Lab, Div Space Sci, Washington, DC 20375 USA
[2] NASA, Goddard Space Flight Ctr, Heliophys Sci Div, Greenbelt, MD 20771 USA
[3] Catholic Univ Amer, Washington, DC 20064 USA
基金
美国国家科学基金会;
关键词
interplanetary medium; solar wind; Sun: coronal mass ejections (CMEs); IN-SITU OBSERVATIONS; FORCE-FREE FIELD; 2010; AUGUST; FLUX-ROPE; SOLAR-WIND; INTERPLANETARY SHOCKS; EMPIRICAL RECONSTRUCTION; GEOMAGNETIC STORMS; CONSTANT-ALPHA; ARRIVAL TIMES;
D O I
10.3847/1538-4365/229/2/29
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We identify coronal mass ejections (CMEs) associated with magnetic clouds (MCs) observed near Earth by the Wind spacecraft from 2008 to mid-2012, a time period when the two STEREO spacecraft were well positioned to study Earth-directed CMEs. We find 31 out of 48 Wind MCs during this period can be clearly connected with a CME that is trackable in STEREO imagery all the way from the Sun to near 1 au. For these events, we perform full 3D reconstructions of the CME structure and kinematics, assuming a flux rope (FR) morphology for the CME shape, considering the full complement of STEREO and SOHO imaging constraints. We find that the FR orientations and sizes inferred from imaging are not well correlated with MC orientations and sizes inferred from the Wind data. However, velocities within the MC region are reproduced reasonably well by the image-based reconstruction. Our kinematic measurements are used to provide simple prescriptions for predicting CME arrival times at Earth, provided for a range of distances from the Sun where CME velocity measurements might be made. Finally, we discuss the differences in the morphology and kinematics of CME FRs associated with different surface phenomena (flares, filament eruptions, or no surface activity).
引用
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页数:26
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