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arXiv 2012.14989astro-ph.HE
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广义分裂磁层:电流片效应

Generalized split monopole magnetospheres: the effects of current sheets

Huiquan Li, Jiancheng Wang

摘要:

我们发现,能量应该被耗散或提取的电流片(CS)的分裂磁层偏离米歇尔分裂磁层,与CS加热或冷却。但是电磁能在任何地方都保持不变。基于平坦时空中由对称性产生的离心双折射解,我们构造了两种广义分裂双折射组态,其中场线与CS以任意角度相交。一种配置类似于所谓的"新脉冲星磁层模型”的外部几何结构,其中高达$47\%$的自旋下降能量被转移到CS中的焦耳加热过程。在另一种配置中,我们观察到负能量耗散在CS中,这通常在旋转黑洞的磁层中观察到。这意味着能量同时从中心恒星和CS中提取,以在无穷远处为输出坡印廷通量提供动力。我们解释了从CS中提取能量的过程,即CS中带电粒子的热能转化为这些粒子在无力(FF)电磁场中漂移的有序动能。因此,CS就像天空中的“空调”,可以加热或冷却,这取决于配置。

英文摘要:

We show that energy should be dissipated or extracted in the current sheet (CS) of a split magnetosphere deviating from the Michel split monopole, with the CS heating up or cooling down. But the electromagnetic energy remains unchanged everywhere. Based on the de-centered monopole solution generated by symmetry in flat spacetime, we construct two generalized split monopole configurations, in which the field lines intersect with the CS at arbitrary angles. One configuration resembles the outer geometry of the so-called ``new pulsar magnetosphere model", for which up to $47\%$ of the spin down energy is transferred to the Joule heating process in the CS. In the other configuration, we observe that negative energy is dissipated in the CS, which is usually observed in magnetospheres on rotating black holes. This means that energy is extracted simultaneously from the central star and the CS to power the output Poynting flux at infinity. We interpret the extraction of energy from the CS as that thermal energy of charged particles in the CS is transferred to the ordered kinetic energy of these particles drifting in the force-free (FF) electromagnetic fields. Hence, the CS is like an ``air conditioner" in the sky, which can heat up or cool down, depending on the configurations.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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