由星际边界探测器观测到的ENA流量带的宽度和变化
S A Fuselier1, F Allegrini, H O Funsten
1Lockheed Martin Advanced Technology Center, Palo Alto, CA 94304, USA. stephen.a.fuselier@lmco.com
概括
星际边界探测器 (IBEX) 任务揭示了一个突出的能量中性原子 (ENA) 流动带. 这条带,可能是由于增强的太阳风和离子群体造成的,是日光层的关键特征.
科学领域:
- 空间物理 空间物理
- 太空物理学 太空物理学
- 天体物理学 天体物理学
背景情况:
- 日球是太阳风产生的巨大等离子体泡,远远超出了行星.
- 能量中性原子 (ENAs) 提供了关于遥远的日球的关键信息,无法通过直接测量获得.
- 星际边界探测器 (IBEX) 任务绘制了ENA排放的地图,以研究日球与星际介质的相互作用.
研究的目的:
- 分析IBEX ENA天空地图中观察到的主导带特征的特征.
- 为了确定日球ENA带的能量依赖性和空间范围.
- 调查带中的增强ENA流量的潜在来源.
主要方法:
- 星际边界探测器 (IBEX) 卫星数据的分析.
- 在天空中映射能量中性原子 (ENA) 流动.
- 定量评估ENA流量强度和带属性 (宽度,经度,度).
主要成果:
- 在IBEX天空地图中发现了增强ENA流动的占主导地位的带特征.
- 带横跨超过300度的经度,平均宽度约为20度.
- 带内的ENA流量是扩散ENA背景的2-3倍,最明显的是在~1keV.
结论:
- 日球ENA带是日球的一个持久且重要的特征.
- 它的特征表明其起源与增强的太阳风和升离子群体在日光层中有关.
- 进一步研究带对于理解日球边界过程至关重要.
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