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The unexpected role of heliospheric boundaries in facilitating interstellar dust penetration at 1–5 AU
Astronomy & Astrophysics ( IF 5.4 ) Pub Date : 2024-06-25 , DOI: 10.1051/0004-6361/202450257
E.A. Godenko , V.V. Izmodenov

Aims. Interstellar dust (ISD) particles penetrate the heliosphere because of the relative motion of the local interstellar cloud and the Sun. The penetrated particles pass through the heliospheric interface, that is, the region in which solar wind and interstellar plasma interact. As a result, the ISD flow is modified after the passage through this region under the influence of electromagnetic force. The main goal of this work is to show how the heliospheric interface affects the distribution of ISD particles near the Sun.Methods. We have developed a Monte Carlo model of the ISD distribution in the heliosphere. It first takes the effects of the heliospheric interface and the rotating heliospheric current sheet into account. The effects of the heliospheric interface were probed using a global heliospheric model.Results. The computation results show that the heliospheric interface strongly influences the distribution of relatively small (radius a = 150 − 250 nm) astronomical silicates. The unexpected finding is that the heliospheric interface facilitates the penetration of a = 150 nm particles at small heliocentric distances and, particularly, to the Ulysses orbit (1 − 5 AU). We demonstrate that the deflection of ISD particles in the outer heliosheath is the principal mechanism that causes the effects of the heliospheric interface on the distribution near the Sun. The computations with different heliospheric models show that the distribution near the Sun is sensitive to the plasma parameters in the pristine local interstellar medium. Thus, we demonstrated that being measured near the Sun, the ISD may serve as a new independent diagnostics of the local interstellar medium and the heliospheric boundaries.

中文翻译:


日光层边界在促进 1-5 天文单位星际尘埃渗透方面发挥的意想不到的作用



目标。由于当地星际云和太阳的相对运动,星际尘埃(ISD)颗粒会穿透日光层。穿透的粒子穿过日光层界面,即太阳风和星际等离子体相互作用的区域。因此,ISD 流在通过该区域后在电磁力的影响下发生改变。这项工作的主要目标是展示日光层界面如何影响太阳附近 ISD 粒子的分布。我们开发了日光层 ISD 分布的蒙特卡罗模型。它首先考虑日光层界面和旋转日光层电流片的影响。使用全局日光层模型探讨了日光层界面的影响。结果。计算结果表明,日光层界面强烈影响相对较小(半径a = 150 − 250 nm)天文硅酸盐的分布。意想不到的发现是,日光层界面有利于a= 150 nm粒子在较小的日心距离处的穿透,特别是尤利西斯轨道(1 − 5 AU)。我们证明,外日鞘中 ISD 粒子的偏转是导致日光层界面影响太阳附近分布的主要机制。不同日光层模型的计算表明,太阳附近的分布对原始局部星际介质中的等离子体参数敏感。因此,我们证明,在太阳附近进行测量,ISD 可以作为局部星际介质和日光层边界的新的独立诊断。
更新日期:2024-06-25