论文标题
相互作用的偶极场中的磁性空
Magnetic nulls in interacting dipolar fields
论文作者
论文摘要
重新连接理论中无效的突出性是由于预期的奇异电流密度和磁性磁性磁线的不确定性。电子惯性改变了这两个特征的含义。仅当其最接近的方法距离超过距离$δ_d$时，才能区分磁场线。电子惯性确保$δ_d\ gtrsim c/ω_{pe} $。位于半径$δ_d$的磁通管内的线处的线上强度$ b $最强的位置在根本上是无法区分的。如果管沿其长度的某个地方封闭了一个$ b = 0 $的点，则消失了，那么可区分的线就不会比$ \ of $ \ of（a^2c/ω__{pe}）^{1/3} $更接近，其中$ a $是磁场的特征性空间尺度。研究了嵌入在空间恒定磁场中的偶极子的偶极子，研究了磁场线的行为。除了区分性的含义外，还获得了对零下电流密度的约束，并得出了薄电流板所需的时间。
The prominence of nulls in reconnection theory is due to the expected singular current density and the indeterminacy of field-lines at a magnetic null. Electron inertia changes the implications of both features. Magnetic field lines are distinguishable only when their distance of closest approach exceeds a distance $Δ_d$. Electron inertia ensures $Δ_d\gtrsim c/ω_{pe}$. The lines that lie within a magnetic flux tube of radius $Δ_d$ at the place where the field strength $B$ is strongest are fundamentally indistinguishable. If the tube, somewhere along its length, encloses a point where $B=0$,vanishes, then distinguishable lines come no closer to the null than $\approx (a^2c/ω_{pe})^{1/3}$, where $a$ is a characteristic spatial scale of the magnetic field. The behavior of the magnetic field lines in the presence of nulls is studied for a dipole embedded in a spatially constant magnetic field. In addition to the implications of distinguishability, a constraint on the current density at a null is obtained, and the time required for thin current sheets to arise is derived.
