Jovian bow shock and magnetopause encounters by the Juno spacecraft
Jovian bow shock and magnetopause encounters by the Juno spacecraft
复制标题
朱诺号宇宙飞船遭遇木星弓激波和磁层顶
DOI：
10.1002/2017gl073177
复制
发表时间：
2016
影响因子：
5.2
通讯作者：
P. Valek
中科院分区：
文献类型：
--
作者：
G. Hospodarsky;W. Kurth;S. Bolton;F. Allegrini;G. Clark;J. Connerney;R. Ebert;D. Haggerty;S. Levin;D. McComas;C. Paranicas;A. Rymer;P. Valek
朱诺号航天器在黎明区（当地时间 0600 附近）多次穿过木星的弓激波 (BS) 和磁层顶 (MP)，无论是在接近木星期间还是在前三个远日轨道期间。使用朱诺场和粒子仪器对所有这些穿越进行了调查，检测到了 51 个弓激波和 97 个磁层顶穿越。 BS 穿越范围为 92 至 128 RJ，进近期间有 1 次遭遇，第一个 apojove 期间有 36 次，第二次为 0 次，第三次为 14 次。 MP 穿越范围为 73 至 114 RJ，进场期间有 8 次 MP 遭遇，第一个 apojove 期间有 40 次遭遇，第二次有 24 次遭遇，第三次有 46 次遭遇。在接近过程中，朱诺号最初遇到了一个膨胀的磁层，导致了一次 BS 和 MP 穿越，几天后又遇到了一个收缩的磁层，导致在 92 RJ 的第一个出站轨道上又遇到了 7 次 MP 穿越和 BS 穿越。在第二个远日月期间，缺乏BS穿越和MP穿越数量有限，这表明磁层存在长期扩张，这可能是由于与稀薄区域相关的长期低太阳风动压造成的。在第三个近日轨道周期检测到的 BS 穿越表明存在另一个高度压缩的磁层周期。
The Juno spacecraft has crossed Jupiter's bow shock (BS) and magnetopause (MP) multiple times in the dawn sector (near 0600 local time), both during the approach to Jupiter and during the first three apojove periods. A survey of all of these crossings using the Juno field and particle instruments has been performed, with 51 bow shock and 97 magnetopause crossings being detected. The BS crossings ranged from 92 to 128 RJ with 1 encounter during the approach, 36 during the first apojove period, 0 on the second, and 14 during the third. The MP crossings ranged from 73 to 114 RJ, with 8 MP encounters during the approach, 40 encounters during the first apojove period, 24 encounters on the second, and 46 during the third. During the approach, Juno initially encountered an expanding magnetosphere resulting in a single BS and MP crossing, followed a few days later by a contracting magnetosphere, resulting in 7 more MP crossings and a BS crossing on the first outbound orbit at 92 RJ. The lack of BS crossings and the limited number of MP crossings during the second apojove period suggests a long period of an expanded magnetosphere, likely caused by a prolonged period of low solar wind dynamic pressure associated with a rarefaction region. The detection of BS crossings on the third apojove period suggests another period of a highly compressed magnetosphere.