| ICMEs Likely From the Same Active Region Observed by Both Helios 1 and IMP 8 |
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| 作者姓名： | DU Dan WANG Chi |
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| 作者单位： | DU Dan WANG Chi (State Key Laboratory of Space Weather，Center for Space Science and Applied Research，Chinese Academy of Sciences，Beijing 100080) (The Graduate School of Chinese Academy of Sciences) |
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| 摘 要： | The chance of an Interplanetary Coronal Mass Ejection (ICME) observed by widely-separated spacecraft is rare. However, such an event provides us a good opportunity to study the propagation and evolution of ICMEs in the heliosphere. On day 72 of 1975, an ICME was observed by Helios 1 at 0.3 AU, while a similar solar wind structure was observed by IMP 8 at Earth on day 70 of 1975. On the basis of comparison of the plasma signatures and the transit time from Helios 1 to IMP 8, we hypothesize the observed ICMEs by both spacecraft are resulted from the same active region on the solar surface. A one-dimensional MHD model was used to track the ICME from Helios 1 (0.3 AU) to Earth. The observed plasma profiles and timing are close to those predicted by our MHD model and thus, give the supports to the model.
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| 关 键 词： | ICME 太阳神 传播 演化 |
| 文章编号： | 0254-6124/2007/27(3)-177-05 |
| 修稿时间： | 2006年7月31日 |
ICMEs Likely From the Same Active Region Observed by Both Helios 1 and IMP 8 |
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| DU Dan,WANG Chi.ICMEs Likely From the Same Active Region Observed by Both Helios 1 and IMP 8[J].Chinese Journal of Space Science,2007,27(3):177-181. |
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| Authors: | DU Dan WANG Chi |
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| Institution: | 1. State Key Laboratory of Space Weather, Center for Space Science and Applied Research,Chinese Academy of Sciences, Beijing 100080;The Graduate School of Chinese Academy of Sciences
2. State Key Laboratory of Space Weather, Center for Space Science and Applied Research,Chinese Academy of Sciences, Beijing 100080 |
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| Abstract: | The chance of an Interplanetary Coronal Mass Ejection (ICME) observed by widely-separated spacecraft is rare. However, such an event provides us a good opportunity to study the propagation and evolution of ICMEs in the heliosphere. On day 72 of 1975, an ICME was observed by Helios 1 at 0.3 AU, while a similar solar wind structure was observed by IMP 8 at Earth on day 70 of 1975. On the basis of comparison of the plasma signatures and the transit time from Helios 1 to IMP 8, we hypothesize the observed ICMEs by both spacecraft are resulted from the same active region on the solar surface. A one-dimensional MHD model was used to track the ICME from Helios 1 (0.3 AU) to Earth. The observed plasma profiles and timing are close to those predicted by our MHD model and thus, give the supports to the model. |
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| Keywords: | ICME Propagation and evolution |
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