边界演变对于太阳能-风力建模的重要性
Mathew J Owens1, Luke Barnard2, Charles N Arge3
1Department of Meteorology, University of Reading, Earley Gate, Reading, Berkshire, RG6 6BB, UK. m.j.owens@reading.ac.uk.
Scientific reports
|November 23, 2024
概括
稳定状态太阳风模型误解了冠状模型的准确性,并导致有缺陷的太空天气预报. 一种新的依赖时间的方法通过将历史太阳风数据纳入更好的预测来提高准确性.
科学领域:
- 空间物理 空间物理
- 太阳物理 太阳物理
- 计算天体物理学 计算天体物理学
背景情况:
- 太阳风是来自太阳冠冕的连续等离子体外流,影响着近地太空天气.
- 目前的太空天气预报依赖于由光球磁场观测所限制的数值流体模型.
- 现有的模型通常将太阳风视为稳定状态流,丢弃了有价值的时间历史信息.
研究的目的:
- 为了比较稳定状态与时间依赖的太阳风建模的准确性.
- 为了确定稳定状态假设如何影响太空天气预报的可靠性.
- 为了证明依赖时间的方法对改进预测的好处.
主要方法:
- 使用了一年的每日更新的冠状模型解决方案.
- 综合比较稳定状态 (SS) 太阳风建模与依赖时间的方法.
- 分析了预测的准确性,一致性和日球磁场变化.
主要成果:
- 这种SS方法从根本上歪曲了冠状模型的准确性.
- 确定了与SS方法相关的三个关键预测问题:矛盾的预测准确性,预测中的高不一致性和不足的日球磁场变性.
- 时间依赖的方法减轻了这些问题,提供了更一致和物理准确的解决方案.
结论:
- 稳态太阳风建模引入了太空天气预报中的重大不准确性.
- 一种依赖时间的方法,包括太阳风的时间历史,为预测条件提供了更可靠的方法.
- 这种改进的预测能力对于减轻空间天气对技术的影响至关重要.
相关概念视频
Boundary Layer Characteristics
55
When a fluid encounters a solid surface, a boundary layer forms due to the interaction between the fluid's motion and the stationary surface. This phenomenon is characterized by a thin region adjacent to the surface where viscous forces dominate, influencing the fluid's velocity profile. The development of the boundary layer begins at the leading edge of the surface and evolves as the fluid moves downstream.As the fluid flows over the surface, friction between the fluid and the wall slows down...
55
Boundary Conditions for Current Density
814
Current density becomes discontinuous across an interface of materials with different electrical conductivities. The normal component of the current density is continuous across the boundary.
814
Magnetostatic Boundary Conditions
877
An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...
877
Electrostatic Boundary Conditions
419
Consider an external electric field propagating through a homogeneous medium. When the electric field crosses the surface boundary of the medium, it undergoes a discontinuity. The electric field can be resolved into normal and tangential components. The amount by which the field changes at any boundary is given by the difference between the field components above and below the surface boundary.
The surface integral of an electric field is given by Gauss's law in integral form and is related to...
The surface integral of an electric field is given by Gauss's law in integral form and is related to...
419
Boundary Conditions: Lossless Lines
83
Consider a single-phase, two-wire, lossless transmission line terminated by an impedance at the receiving end and a source with Thevenin voltage and impedance at the sending end. The line, with length, has a surge impedance and wave velocity determined by the line's inductance and capacitance.
At the receiving end, the boundary condition states that the voltage equals the product of the receiving-end impedance and current. This relationship is expressed as a function of the incident and...
At the receiving end, the boundary condition states that the voltage equals the product of the receiving-end impedance and current. This relationship is expressed as a function of the incident and...
83
Electrostatic Boundary Conditions in Dielectrics
1.1K
When an electric field passes from one homogeneous medium to another, crossing the boundary between the two mediums imparts a discontinuity in the electric field. This results in electrostatic boundary conditions that depend on the type of mediums the field propagates through.
Consider a case where both the mediums across a boundary are two different dielectric materials. Recall that the electric field and electric displacement are proportional and related through the material's...
Consider a case where both the mediums across a boundary are two different dielectric materials. Recall that the electric field and electric displacement are proportional and related through the material's...
1.1K


