Unifying the Validation of Ambient Solar Wind Models

Forecasting the Ambient Solar Wind with Numerical Models: I. On the Implementation of an Operational Framework

The ambient solar wind conditions in interplanetary space and in the near-Earth environment are determined by activity on the Sun. Steady solar wind streams modulate the propagation behaviour of interplanetary coronal mass ejections and are themselves an important driver of recurrent geomagnetic storm activity. The knowledge of the ambient solar wind flows and fields is thus an essential component of successful space weather forecasting. Here, we present an implementation of an operational framework for operating, validating and optimizing models of the ambient solar wind flow on the example o…

Using gradient boosting regression to improve ambient solar wind model predictions

Studying the ambient solar wind, a continuous pressure-driven plasma flow emanating from our Sun, is an important component of space weather research. The ambient solar wind flows in interplanetary space determine how solar storms evolve through the heliosphere before reaching Earth, and especially during solar minimum are themselves a driver of activity in the Earth's magnetic field. Accurately forecasting the ambient solar wind flow is therefore imperative to space weather awareness. Here we present a machine learning approach in which solutions from magnetic models of the solar corona are u…

基于同步光球磁图边界条件的太阳风流动集合建模. I. 内日球层的多点验证

Ensemble Modeling of the Solar Wind Flow with Boundary Conditions Governed by Synchronic Photospheric Magnetograms. I. Multi-point Validation in the Inner Heliosphere

该研究通过多尺度流体动力学-动力学模拟套件（MS-FLUKSS）中的经验驱动磁流体动力学模型对三维太阳风流动进行集合模拟，验证了光球边界条件不确定性对结果的影响，其结果与多探测器数据吻合良好，为改进空间天气预报提供了支持。

Solar wind turbulent cascade from MHD to sub-ion scales: large-size 3D hybrid particle-in-cell simulations

Spectral properties of the turbulent cascade from fluid to kinetic scales in collisionless plasmas are investigated by means of large-size three-dimensional (3D) hybrid (fluid electrons, kinetic protons) particle-in-cell simulations. Initially isotropic Alfvènic fluctuations rapidly develop a strongly anisotropic turbulent cascade, mainly in the direction perpendicular to the ambient magnetic field. The omnidirectional magnetic field spectrum shows a double power-law behavior over almost two decades in wavenumber, with a Kolmogorov-like index at large scales, a spectral break around ion scales…

是什么导致了 Wang-Sheeley-Arge 太阳风模型在 L1 处的误差？

What Causes Errors in Wang-Sheeley-Arge Solar Wind Modeling at L1 ?

该研究分析15个卡林顿周并详查 CR 2052，发现提高 WSA/PFSS 网格分辨率并优化源表面高度可改善 L1 高速太阳风预测。