On the Escape of Low-frequency Waves from Magnetospheres of Neutron Stars

IF 4.8 2区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS
Ephim Golbraikh, Yuri Lyubarsky
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引用次数: 0

Abstract

Abstract We study the nonlinear decay of the fast magnetosonic (fms) into the Alfvén waves in relativistic force-free magnetohydrodynamics. The work has been motivated by models of pulsar radio emission and fast radio bursts (FRBs), in which the emission is generated in neutron star magnetospheres at conditions when not only the Larmor but also the plasma frequencies significantly exceed the radiation frequency. The decay process places limits on the source luminosity in these models. We estimated the decay rate and showed that the phase volume of Alfvén waves available for the decay of an fms wave is infinite. Therefore, the energy of fms waves could be completely transferred to the small-scale Alfvén waves not via a cascade, as in the Kolmogorov turbulence, but directly. Our results explain the anomalously low radio efficiency of the Crab pulsar and show that FRBs could not be produced well within magnetar magnetospheres.
中子星磁层低频波的逸出
摘要研究了在相对论性无力磁流体力学中快速磁子(fms)向alfvsamn波的非线性衰减。这项工作的动机是脉冲星射电发射和快速射电暴(FRBs)模型,其中发射是在中子星磁球中产生的,当拉莫尔频率和等离子体频率显著超过辐射频率时。在这些模型中,衰减过程限制了光源的亮度。我们估计了衰减率,并表明可用于fms波衰减的alfvsamn波的相体积是无限的。因此,fms波的能量可以完全传递给小尺度的alfvsamn波,而不是像在Kolmogorov湍流中那样通过级联,而是直接传递。我们的研究结果解释了蟹状星云脉冲星异常低的射电效率,并表明在磁星磁层内不能很好地产生快速射电暴。
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来源期刊
Astrophysical Journal
Astrophysical Journal 地学天文-天文与天体物理
CiteScore
8.40
自引率
30.60%
发文量
2854
审稿时长
1 months
期刊介绍: The Astrophysical Journal is the foremost research journal in the world devoted to recent developments, discoveries, and theories in astronomy and astrophysics.
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