Modeling Shocks Detected by Voyager 1 in the Local Interstellar Medium

被引：44

作者：

Kim, T. K. ^{[1
]}

Pogorelov, N. V. ^{[1
,2
]}

Burlaga, L. F. ^{[3
]}

机构：

[1] Univ Alabama Huntsville, Ctr Space Plasma & Aeron Res, Huntsville, AL 35805 USA

[2] Univ Alabama Huntsville, Dept Space Sci, Huntsville, AL 35805 USA

[3] NASA, Goddard Space Flight Ctr, Code 673, Greenbelt, MD 20771 USA

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2017年 / 843卷 / 02期

基金：

美国国家科学基金会;

关键词：

ISM: magnetic fields; magnetohydrodynamics (MHD); methods: numerical; solar wind; Sun: heliosphere; MAGNETIC-FIELD; NEUTRAL HYDROGEN; SOLAR-WIND; HELIOSHEATH; REGION;

D O I：

10.3847/2041-8213/aa7b2b

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The magnetometer (MAG) on Voyager I (VI) has been sampling the interstellar magnetic field (ISMF) since 2012 August. The VI MAG observations have shown draped ISMF in the very local interstellar medium disturbed occasionally by significant enhancements in magnetic field strength. Using a three-dimensional, data-driven, multi fluid model, we investigated these magnetic field enhancements beyond the heliopause that are supposedly associated with solar transients. To introduce time-dependent effects at the inner boundary at 1 au, we used daily averages of the solar wind parameters from the OMNI data set. The model ISMF strength, direction, and proton number density are compared with VI data beyond the heliopause. The model reproduced the large-scale fluctuations between 2012.652 and 2016.652, including major events around 2012.9 and 2014.6. The model also predicts shocks arriving at VI around 2017.395 and 2019.502. Another model driven by OMNI data with interplanetary coronal mass ejections (ICMEs) removed at the inner boundary suggests that ICMEs may play a significant role in the propagation of shocks into the interstellar medium.

引用

页数：7

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