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Influence of solar flare's location and heliospheric current sheet on the associated shock's arrival at Earth
Zhao, X. H.; Feng, X. S.; Wu, C. C.; 北京8701信箱
Department空间天气学国家重点实验室
Source PublicationJournal of Geophysical Research-Space Physics
2007
Volume112Issue:A6Pages:A06107
ISSN0148-0227
Language英语
KeywordCoronal Mass Ejections Interplanetary Shock Geomagnetic Storms Plasma Sheet Magnetic Storms 1 Au Disturbances Propagation Wind Mhd
AbstractWe study the source locations of 130 solar flare-type II radio burst events with the associated interplanetary shocks observed by L1 spacecraft (type A events) and 217 flare-type II events without such shocks observed at L1 (type B events) during February 1997-August 2002. In particular, we investigate the relative positions between the flare sources, the heliospheric current sheet (HCS), and the Earth. We found the following results: (1) Solar flares are usually distributed within [S30 degrees, N30 degrees] in heliographic latitude and [S30 degrees, N30 degrees] x [E10 degrees, W30 degrees] is the predominant source region on the solar disk that includes the majority of geoeffective solar flares. (2) The shocks with the associated flares located near the HCS would have a lower probably of reaching the Earth. For the Earth-encountered shocks, their initial speeds are distinctly higher when their associated flares are located near the HCS. (3) The angular distance from the flare source to the Earth (defined as Psi below) also contributes to the probability of the associated shock being observed at the Earth. The shock arrival probability decreases with the increment of Y and the mean initial shock speed increases with Y for those Earth-encountered shocks. (4) The so-called "same-opposite side effect'' of the HCS is confirmed to exist. That is, the shocks whose associated flares are located on the same side of the HCS as the Earth (called as "same side events'') have a greater chance of reaching the Earth than those shocks with their associated flares on the opposite side ("opposite side events''). Here for the first time, a comprehensive sample of solar transient events of both arriving and nonarriving ones (at Earth) is used to testify to the same-opposite side effect. These results would be valuable in understanding the solar-terrestrial relations, and helpful for space weather prediction.
Indexed BySCI
Funding Project中国科学院空间科学与应用研究中心
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/1084
Collection空间科学部
Corresponding Author北京8701信箱
Recommended Citation
GB/T 7714
Zhao, X. H.,Feng, X. S.,Wu, C. C.,et al. Influence of solar flare's location and heliospheric current sheet on the associated shock's arrival at Earth[J]. Journal of Geophysical Research-Space Physics,2007,112(A6):A06107.
APA Zhao, X. H.,Feng, X. S.,Wu, C. C.,&北京8701信箱.(2007).Influence of solar flare's location and heliospheric current sheet on the associated shock's arrival at Earth.Journal of Geophysical Research-Space Physics,112(A6),A06107.
MLA Zhao, X. H.,et al."Influence of solar flare's location and heliospheric current sheet on the associated shock's arrival at Earth".Journal of Geophysical Research-Space Physics 112.A6(2007):A06107.
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