论文标题
近地磁云内部的湍流和异常电阻率
Turbulence and Anomalous Resistivity inside Near-Earth Magnetic Clouds
论文作者
论文摘要
我们使用来自风线航天器的原位数据来调查质子密度和总磁场中湍流波动的幅度，并在大量的近地磁云（MCS）样本中与冠状质量弹出（CMES）相关。我们发现，MCS内部质子密度波动（$Δn_{p}/n_ {p} $）的调制指数的最可能值最可能的值在0.13至0.16内，而总磁场波动（$ΔB/b $）的调制指数最可能的值范围为0.04至0.04至0.04至0.04至0.04至0.04至0.04至0.04范围。我们还发现，MCS内部的马赫数波动（$ΔM$）的最可能的值为$ \约0.1 $。由于湍流磁场波动引起的电子散射引起的近地MC内部电阻率超过了（常用的）尖峰电阻率，高约为500-1000美元。由于这种异常的电阻率而产生的增强的焦耳加热可能会影响我们对CME传播能量学的理解。
We use in-situ data from the Wind spacecraft to survey the amplitude of turbulent fluctuations in the proton density and total magnetic field inside a large sample of near-Earth magnetic clouds (MCs) associated with coronal mass ejections (CMEs) from the Sun. We find that the most probable value of the modulation index for proton density fluctuations ($δn_{p}/n_{p}$) inside MCs ranges from 0.13 to 0.16, while the most probable values for the modulation index of the total magnetic field fluctuations ($δB/B$) range from 0.04 to 0.05. We also find that the most probable value of the Mach number fluctuations ($δM$) inside MCs is $\approx 0.1$. The anomalous resistivity inside near-Earth MCs arising from electron scattering due to turbulent magnetic field fluctuations exceeds the (commonly used) Spitzer resistivity by a factor of $\approx 500-1000$. The enhanced Joule heating arising from this anomalous resistivity could impact our understanding of the energetics of CME propagation.
