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A Solar Eruption with Relatively Strong Geoeffectiveness Originating from Active Region Peripheral Diffusive Polarities
Wang, Rui; Liu, Ying D.; Hu, Huidong; Zhao, Xiaowei; Liu, YD (reprint author), Chinese Acad Sci, State Key Lab Space Weather, Natl Space Sci Ctr, Beijing, Peoples R China.; Liu, YD (reprint author), Univ Chinese Acad Sci, Beijing 100049, Peoples R China.
Department空间科学部
Source PublicationASTROPHYSICAL JOURNAL
2018
Volume863Issue:1Pages:81
ISSN0004-637X
Language英语
KeywordSolar-terrestrial Relations Sun: Activity Sun: Coronal Mass Ejections (Cmes) Sun: Magnetic Fields
AbstractWe report the observations of a moderate but relatively intense geoeffective solar eruption on 2015 November 4 from the peripheral diffusive polarities of active region 12443. We use space-borne Solar Dynamics Observatory and ACE observations. EUV images identified a helical pattern along a filament channel, and we regard this channel as flux-rope structure. Flow velocity derived from tracked magnetograms infers converging motion along the polarity inversion line beneath the filament channel. An associated magnetic cancellation process was detected in the converging region. Further, the pre-eruptive EUV brightening was observed in the converging region, the most intense part of which appeared in the magnetic cancellation region. These observations imply that the converging and canceling flux probably contributed to the formation of the helical magnetic fields associated with the flux rope. A filament-height estimation method suggests that the middle part of the filament probably lies at a low altitude and was consistent with the initial place of the eruption. A thick current channel associated with the flux rope is also determined. For an expanding thick current channel, the critical height of the decay index for torus instability lies in the range of 37-47 Mm. Southward magnetic fields in the sheath and the ejecta induced a geomagnetic storm with a D-st global minimum of similar to-90 nT.
Indexed BySCI
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/6397
Collection空间科学部
Corresponding AuthorLiu, YD (reprint author), Chinese Acad Sci, State Key Lab Space Weather, Natl Space Sci Ctr, Beijing, Peoples R China.; Liu, YD (reprint author), Univ Chinese Acad Sci, Beijing 100049, Peoples R China.
Recommended Citation
GB/T 7714
Wang, Rui,Liu, Ying D.,Hu, Huidong,et al. A Solar Eruption with Relatively Strong Geoeffectiveness Originating from Active Region Peripheral Diffusive Polarities[J]. ASTROPHYSICAL JOURNAL,2018,863(1):81.
APA Wang, Rui,Liu, Ying D.,Hu, Huidong,Zhao, Xiaowei,Liu, YD ,&Liu, YD .(2018).A Solar Eruption with Relatively Strong Geoeffectiveness Originating from Active Region Peripheral Diffusive Polarities.ASTROPHYSICAL JOURNAL,863(1),81.
MLA Wang, Rui,et al."A Solar Eruption with Relatively Strong Geoeffectiveness Originating from Active Region Peripheral Diffusive Polarities".ASTROPHYSICAL JOURNAL 863.1(2018):81.
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