Investigation of the transient cosmic ray decreases observed by voyagers in 2007: A numerical approach
Investigation of the transient cosmic ray decreases observed by voyagers in 2007: A numerical approach
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DOI：
10.1002/2013ja019218
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发表时间：
2013-12
期刊：
影响因子：
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通讯作者：
Xi Luo;Ming Zhang;Xueshang Feng;J. E. Mendoza-Torres
中科院分区：
文献类型：
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作者：
Xi Luo;Ming Zhang;Xueshang Feng;J. E. Mendoza-Torres
2006年和2007年，旅行者一号和二号记录了一系列宇宙射线瞬态减少事件。人们相信这些短暂的减少事件是由局部合并交互区域（LMIR）引起的。将 LMIR 模型与我们的宇宙射线传输代码相结合，我们研究了这些宇宙射线瞬态减少事件的原因。模拟表明，即使观测位置超出了 LMIR 的纬度范围，LMIR 和终端激波 (TS) 之间的相互作用也会影响日鞘中的宇宙射线传输。为了进一步了解航海者观察到的这些瞬时减少事件，我们模拟了两个 LMIR 传播到日鞘的场景。其中一架 LMIR 于 2007.43 抵达航行者 2 号，另一架于 2007.55 抵达。他们分别于2007.56和2007.76进一步与TS相互作用，导致航行者1号观测到的宇宙线强度降低，比TS超出约10 AU。
In 2006 and 2007, Voyager 1 and 2 recorded a series of cosmic ray transient decrease events. It is believed that these transient decrease events are caused by the Local Merged Interaction Region (LMIR). Incorporating a LMIR model with our cosmic ray transport code, we investigate the causes for these cosmic ray transient decrease events. The simulation shows that the interaction between LMIR and termination shock (TS) affect the cosmic ray transport in the heliosheath, even if the observed location is beyond latitude extent of the LMIR. To further understand these transient decrease events observed by voyagers, we simulate a scenario of two LMIRs propagating into the heliosheath. One of the LMIRs arrived at Voyager 2 at 2007.43 and the other at 2007.55. They went further to interact with the TS at 2007.56 and 2007.76 separately, causing the cosmic ray intensity decreases observed by Voyager 1 which was about 10 AU beyond the TS.