Electric Field Screening in Pair Discharges and Generation of Pulsar Radio Emission
Electric Field Screening in Pair Discharges and Generation of Pulsar Radio Emission
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DOI：
10.3847/2041-8213/ac7c71
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发表时间：
2022-02
期刊：
影响因子：
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通讯作者：
E. Tolman;A. Philippov;A. Timokhin
中科院分区：
文献类型：
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作者：
E. Tolman;A. Philippov;A. Timokhin
脉冲星的射电发射可能产生在对放电中，当加速电场被新产生的对屏蔽时，等离子体填充脉冲星磁层。在这篇文章中，我们发展了一个简化的解析理论来筛选这些对放电中的电场，并用它来估计总射电光度和光谱。排出有三个阶段。首先，电场第一次被屏蔽，开始振荡。接下来，出现一个非线性阶段。在这个阶段，电场的振幅经历了强烈的阻尼，因为电场极大地改变了新形成的对的动量。这种强阻尼停止，系统进入最后的线性阶段，此时电场不再能显著改变对动量。应用于脉冲星，该理论可以解释射电发射的几个方面，包括观测到的光度，L rad ~ 1028 erg s−1，和观测到的光谱，s ω ~ ω−1.4±1.0。
Pulsar radio emission may be generated in pair discharges that fill the pulsar magnetosphere with plasma as an accelerating electric field is screened by freshly created pairs. In this Letter, we develop a simplified analytic theory for the screening of the electric field in these pair discharges and use it to estimate total radio luminosity and spectrum. The discharge has three stages. First, the electric field is screened for the first time and starts to oscillate. Next, a nonlinear phase occurs. In this phase, the amplitude of the electric field experiences strong damping because the field dramatically changes the momenta of newly created pairs. This strong damping ceases, and the system enters a final linear phase, when the electric field can no longer dramatically change pair momenta. Applied to pulsars, this theory may explain several aspects of radio emission, including the observed luminosity, L rad ∼ 1028 erg s−1, and the observed spectrum, S ω ∼ ω −1.4±1.0.