The Pickup Ion-mediated Solar Wind
The Pickup Ion-mediated Solar Wind
复制标题
DOI：
10.3847/1538-4357/aaebfe
复制
发表时间：
2018-12
期刊：
影响因子：
--
通讯作者：
G. Zank;L. Adhikari;L.-L. Zhao-L.;P. Mostafavi;E. Zirnstein;D. McComas
中科院分区：
文献类型：
--
作者：
G. Zank;L. Adhikari;L.-L. Zhao-L.;P. Mostafavi;E. Zirnstein;D. McComas
新视野号冥王星周围太阳风（NH SWAP）仪器首次直接观测了太阳风中距离在11.26至38 Au之间的星际和He拾取离子（PUI）。观测结果表明，氢电离腔以外的遥远太阳风确实是由PUI介导的。PUI的创建修改了负责其自身散射的底层低频湍流场。这些低频波动的耗散有助于加热太阳风等离子体，并解释了所观察到的非绝热太阳风温度分布和超过30 Au的可能缓慢的温度升高。我们开发了一个非常通用的理论模型，结合PUI，太阳风热等离子体，行星际磁场，和低频湍流来描述的大规模太阳风，PUI，和湍流的演变从1-84 Au，垂直的日光层终止激波的结构，和传输到内日鞘湍流，扩展的经典模型的Holzer和Isenberg。详细比较的理论模型的解决方案和来自旅行者2号和NH SWAP数据集的观测结果表明，两者之间的合理的物理参数非常一致。
The New Horizons Solar Wind Around Pluto (NH SWAP) instrument has provided the first direct observations of interstellar and He pickup ions (PUIs) at distances between ∼11.26 and 38 au in the solar wind. The observations demonstrate that the distant solar wind beyond the hydrogen ionization cavity is indeed mediated by PUIs. The creation of PUIs modifies the underlying low-frequency turbulence field responsible for their own scattering. The dissipation of these low-frequency fluctuations serves to heat the solar wind plasma, and accounts for the observed non-adiabatic solar wind temperature profile and a possible slow temperature increase beyond ∼30 au. We develop a very general theoretical model that incorporates PUIs, solar wind thermal plasma, the interplanetary magnetic field, and low-frequency turbulence to describe the evolution of the large-scale solar wind, PUIs, and turbulence from 1–84 au, the structure of the perpendicular heliospheric termination shock, and the transmission of turbulence into the inner heliosheath, extending the classical models of Holzer and Isenberg. A detailed comparison of the theoretical model solutions and observations derived from the Voyager 2 and NH SWAP data sets shows excellent agreement between the two for reasonable physical parameters.