Empirical Relationship between the Magnetic Field and the Mass and Energy Flux in the Source Regions of the Solar Wind
Empirical Relationship between the Magnetic Field and the Mass and Energy Flux in the Source Regions of the Solar Wind
复制标题
太阳风源区磁场与质量和能量通量之间的经验关系
DOI：
10.1086/309650
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发表时间：
1995
期刊：
影响因子：
--
通讯作者：
Y.
中科院分区：
文献类型：
--
作者：
Y.
利用在地球上测量的太阳风速和质量密度的日平均值，以及将观测到的光球场外推至 1 AU 的改进方法，我们构建了日冕场强度 B0 与日冕底部质量通量密度 ρ0v0 和总能通量密度 Fw0 之间的散点图。平均而言，ρ0v0 和 Fw0 均随 B0 大致线性增加；它们还表现出随着日冕通量管膨胀因子的单调增加。然而，地球上的风速由比率 Fw0/(ρ0v0) 决定，基本上与 B0 无关，但随着膨胀系数的增加而趋于减小（如早期研究中发现的那样）。
Using daily averages of the solar wind speed and mass density measured at Earth together with an improved method for extrapolating the observed photospheric field to 1 AU, we construct scatter plots relating the coronal field strength B0 to the mass flux density ρ0v0 and the total energy flux density Fw0 at the coronal base. On average, both ρ0v0 and Fw0 increase roughly linearly with B0; they also show a monotonic increase with the coronal flux-tube expansion factor. However, the wind speed at Earth, determined by the ratio Fw0/(ρ0v0), is essentially independent of B0, while tending to decrease with increasing expansion factor (as found in earlier studies).