Combined ∼10 eV to ∼344 MeV Particle Spectra and Pressures in the Heliosheath along the Voyager 2 Trajectory
Combined ∼10 eV to ∼344 MeV Particle Spectra and Pressures in the Heliosheath along the Voyager 2 Trajectory
复制标题
DOI：
10.3847/2041-8213/abcaaa
复制
发表时间：
2020-12-01
影响因子：
7.9
通讯作者：
Opher, Merav
中科院分区：
文献类型：
--
作者：
Dialynas, Konstantinos;Galli, Andre;Opher, Merav
我们报告了航行者 2 (V2) 航天器上等离子科学 (PLS)、低能带电粒子 (LECP) 和宇宙射线子系统 (CRS) 实验中的类似于 10 eV 到类似于 344 MeV 的原位离子测量值的独特组合，以及来自星际边界探测器 (IBEX) 的遥感类似于 110 eV 到类似于 55 keV 高能中性原子 (ENA) 测量值的独特组合。卡西尼号任务中的离子和中性相机（INCA）。这种组合是在 2009 年至 2016 年底期间沿着 V2 轨迹完成的，旨在评估日鞘内离子能谱的特性。组合能谱表现出一系列软化和硬化断裂，为日鞘内各种离子加速过程提供了重要的见解。 5.2 keV 的离子对总压有显着贡献。假设所有 ENA（类似于 110 eV 至 55 keV）都是由日鞘内部的电荷交换相互作用产生的，我们估计在日鞘上游平衡 V2 方向的压力所需的磁场类似于 0.67 nT。这个数字与2018年11月航天器进入星际空间时测量到的V2磁场一致。
We report a unique combination of similar to 10 eV to similar to 344 MeV in situ ion measurements from the Plasma Science (PLS), Low Energy Charged Particle (LECP), and Cosmic Ray Subsystem (CRS) experiments on the Voyager 2 (V2) spacecraft, and remotely sensed similar to 110 eV to similar to 55 keV energetic neutral atom (ENA) measurements from the Interstellar Boundary Explorer (IBEX) mission and Ion and Neutral Camera (INCA) on the Cassini mission. This combination is done over the time period from 2009 to the end of 2016, along the V2 trajectory, toward assessing the properties of the ion energy spectra inside the heliosheath. The combined energy spectra exhibit a series of softening and hardening breaks, providing important insights on the various ion acceleration processes inside the heliosheath. Ions in the 5.2 keV) provide a significant contribution to the total pressure. With the assumption that all ENAs (similar to 110 eV to 55 keV) are created by charge-exchange interactions inside the heliosheath, we estimate that the magnetic field upstream at the heliopause required to balance the pressure from the heliosheath in the direction of V2 is similar to 0.67 nT. This number is consistent with the measured magnetic field at V2 from 2018 November, when the spacecraft entered interstellar space.