磁扭曲：空间天气的一种来源和性质
Magnetic twist: a source and property of space weather
摘要：
我们提出的证据有限的磁螺旋密度在日光层和数值模型，并将其与太阳对流区的发电机的磁场属性。我们使用模拟和太阳风数据来计算磁螺旋度直接从模拟，或间接使用的时间序列的斜对称分量的磁相关张量。我们发现太阳发电机在小尺度下产生负的磁螺旋度，在大尺度下产生正的磁螺旋度。然而，在日球层中，这些性质被逆转，现在的磁螺旋度在小尺度上是正的，在大尺度上是负的。我们解释这一事实，即负扩散磁螺旋度通量对应于磁螺旋度的正梯度，这导致在北半球的一些半径从负值到正值的符号变化。
英文摘要：
We present evidence for finite magnetic helicity density in the heliosphere and numerical models thereof, and relate it to the magnetic field properties of the dynamo in the solar convection zone. We use simulations and solar wind data to compute magnetic helicity either directly from the simulations, or indirectly using time series of the skew-symmetric components of the magnetic correlation tensor. We find that the solar dynamo produces negative magnetic helicity at small scales and positive at large scales. However, in the heliosphere these properties are reversed and the magnetic helicity is now positive at small scales and negative at large scales. We explain this by the fact that a negative diffusive magnetic helicity flux corresponds to a positive gradient of magnetic helicity, which leads to a change of sign from negative to positive values at some radius in the northern hemisphere.
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