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STRUCTURE, PROPAGATION, AND EXPANSION OF A CME-DRIVEN SHOCK IN THE HELIOSPHERE: A REVISIT OF THE 2012 JULY 23 EXTREME STORM
Liu, Ying D.; Hu, Huidong; Zhu, Bei; Luhmann, Janet G.; Vourlidas, Angelos
Department空间科学部
Source PublicationASTROPHYSICAL JOURNAL
2017
Volume834Issue:2Pages:158
ISSN0004-637X
Language英语
KeywordShock Waves Solar-terrestrial Relations Solar Wind Sun: Coronal Mass Ejections (Cmes) Sun: Radio Radiation
AbstractWe examine the structure, propagation, and expansion of the shock associated with the 2012 July 23 extreme coronal mass ejection. Characteristics of the shock determined from multi-point imaging observations are compared to in situ measurements at different locations and a complex radio type II burst, which according to our definition has multiple branches that may not all be fundamental-harmonic related. The white-light shock signature can be modeled reasonably well by a spherical structure and was expanding backward even on the opposite side of the Sun. The expansion of the shock, which was roughly self-similar after the first similar to 1.5 hr from launch, largely dominated over the translation of the shock center for the time period of interest. Our study also suggests a bowshockmorphology around the nose at later times due to the outward motion in combination with the expansion of the ejecta. The shock decayed and failed to reach Mercury in the backward direction and the Solar Terrestrial Relations Observatory B (STEREO B) and Venus in the lateral directions, as indicated by the imaging and in situ observations. The shock in the nose direction, however, may have persisted to the far outer heliosphere, with predicted impact on Dawn around 06: 00 UT on July 25 and on Jupiter around 23: 30 UT on July 27 by a magnetohydrodynamic model. The type II burst shows properties generally consistent with the spatial/temporal variations of the shock deduced from imaging and in situ observations. In particular, the low-frequency bands agree well with the in situ measurements of a very low density ahead of the shock at STEREO A.
Indexed BySCI
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/5810
Collection空间科学部
Recommended Citation
GB/T 7714
Liu, Ying D.,Hu, Huidong,Zhu, Bei,et al. STRUCTURE, PROPAGATION, AND EXPANSION OF A CME-DRIVEN SHOCK IN THE HELIOSPHERE: A REVISIT OF THE 2012 JULY 23 EXTREME STORM[J]. ASTROPHYSICAL JOURNAL,2017,834(2):158.
APA Liu, Ying D.,Hu, Huidong,Zhu, Bei,Luhmann, Janet G.,&Vourlidas, Angelos.(2017).STRUCTURE, PROPAGATION, AND EXPANSION OF A CME-DRIVEN SHOCK IN THE HELIOSPHERE: A REVISIT OF THE 2012 JULY 23 EXTREME STORM.ASTROPHYSICAL JOURNAL,834(2),158.
MLA Liu, Ying D.,et al."STRUCTURE, PROPAGATION, AND EXPANSION OF A CME-DRIVEN SHOCK IN THE HELIOSPHERE: A REVISIT OF THE 2012 JULY 23 EXTREME STORM".ASTROPHYSICAL JOURNAL 834.2(2017):158.
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