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SUN-TO-EARTH CHARACTERISTICS OF THE 2012 JULY 12 CORONAL MASS EJECTION AND ASSOCIATED GEO-EFFECTIVENESS
Hu, Huidong; Liu, Ying D.; Wang, Rui; Moestl, Christian; Yang, Zhongwei; Liu, YD (reprint author), Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing 100190, Peoples R China.; Liu, YD (reprint author), Univ Chinese Acad Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China.
Department空间科学部
Source PublicationASTROPHYSICAL JOURNAL
2016
Volume829Issue:2Pages:97
ISSN0004-637X
Language英语
KeywordShock Waves - Solar-terrestrial Relations - Solar Wind - Sun Coronal Mass Ejections (Cmes) - Sun Radio Radiation
AbstractWe analyze multi-spacecraft observations associated with the 2012 July 12 coronal mass ejection (CME), covering the source region on the Sun from the Solar Dynamics Observatory, stereoscopic imaging observations from the Solar Terrestrial Relations Observatory (STEREO), magnetic field characteristics from Mercury Surface, Space Environment, Geochemistry, and Ranging (MESSENGER), and type II radio burst and in situ measurements from Wind. A triangulation method based on STEREO stereoscopic observations is employed to determine the kinematics of the CME, and the outcome is compared with the results derived from the type II radio burst using a solar wind electron density model. A Grad-Shafranov technique is applied to Wind in situ data to reconstruct the flux-rope structure and compare it with the observations of the solar source region, which helps in understanding the geo-effectiveness associated with the CME structure. Our conclusions are as follows: (1) the CME undergoes an impulsive acceleration, a rapid deceleration before reaching MESSENGER, and then a gradual deceleration out to 1 au, which should be considered in CME kinematics models; (2) the type II radio burst was probably produced from a high-density interaction region between the CME-driven shock and a nearby streamer or from the shock flank with lower heights, which implies uncertainties in the determination of CME kinematics using solely type II radio bursts; (3) the flux-rope orientation and chirality deduced from in situ reconstructions at Wind agree with those obtained from solar source observations; (4) the prolonged southward magnetic field near the Earth is mainly from the axial component of the largely southward inclined flux rope, which indicates the importance of predicting both the flux-rope orientation and magnetic field components in geomagnetic activity forecasting.
Indexed BySCI
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/5633
Collection空间科学部
Corresponding AuthorLiu, YD (reprint author), Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing 100190, Peoples R China.; Liu, YD (reprint author), Univ Chinese Acad Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China.
Recommended Citation
GB/T 7714
Hu, Huidong,Liu, Ying D.,Wang, Rui,et al. SUN-TO-EARTH CHARACTERISTICS OF THE 2012 JULY 12 CORONAL MASS EJECTION AND ASSOCIATED GEO-EFFECTIVENESS[J]. ASTROPHYSICAL JOURNAL,2016,829(2):97.
APA Hu, Huidong.,Liu, Ying D..,Wang, Rui.,Moestl, Christian.,Yang, Zhongwei.,...&Liu, YD .(2016).SUN-TO-EARTH CHARACTERISTICS OF THE 2012 JULY 12 CORONAL MASS EJECTION AND ASSOCIATED GEO-EFFECTIVENESS.ASTROPHYSICAL JOURNAL,829(2),97.
MLA Hu, Huidong,et al."SUN-TO-EARTH CHARACTERISTICS OF THE 2012 JULY 12 CORONAL MASS EJECTION AND ASSOCIATED GEO-EFFECTIVENESS".ASTROPHYSICAL JOURNAL 829.2(2016):97.
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201682997.pdf(4880KB)期刊论文作者接受稿开放获取CC BY-NC-SAApplication Full Text
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