pulsargiantpulsecoherentinstabilitynearlightcylinder

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	pulsargiantpulsecoherentinstabilitynearlightcylinder
	WeiYang Wang 11; JiGuang Lu 8; SongBo Zhang 10; XueLei Chen 11; Rui Luo 2; RenXin Xu 9
刊名	中国科学物理学力学天文学英文版
	2019
卷号	000 期号:007 页码:10
ISSN号	1674-7348
英文摘要	Giant pulses(GPs) are extremely bright individual pulses of radio pulsar. In microbursts of Crab pulsar, which is an active GP emitter, zebra-pattern-like spectral structures are observed, which are reminiscent of the 'zebra bands' that are observed in type Ⅳ solar radio flares. However, band spacing linearly increases with the band center frequency of ~5-30 GHz. In this study, we propose that the Crab pulsar GP can originate from the coherent instability of plasma near a light cylinder. Further, the growth of coherent instability can be attributed to the resonance observed between the cyclotron-resonant-excited wave and the background plasma oscillation. The particles can be injected into the closed-field line regions owing to magnetic reconnection near a light cylinder. These particles introduce a large amount of free energy that further causes cyclotron-resonant instability, which grows and amplifies radiative waves at frequencies close to the electron cyclotron harmonics that exhibit zebra-pattern-like spectral band structures. Further, these structures can be modulated by the resonance between the cyclotron-resonant-excited wave and the background plasma oscillation. In this scenario, the band structures of the Crab pulsar can be well fitted by a coherent instability model, where the plasma density of a light cylinder should be ~1013-15 cm-3, with an estimated gradient of >5.5 × 105 cm-4. This process may be accompanied by high-energy emissions. Similar phenomena are expected to be detected in other types of GP sources that have magnetic fields of ? 106 G in a light cylinder.
语种	英语
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/45301]
专题	中国科学院国家天文台
作者单位	1.Department of Astronomy,School of Physics,Peking University 2.Kavli Institute for Astronomy and Astrophysics,Peking University 3.Center for High Energy Physics,Peking University 4.International Centre for Radio Astronomy Research,University of Western Australia,Australia 5.CSIRO Astronomy and Space Science,Australia Telescope National Facility,Australia 6.中国科学院紫金山天文台 7.Key Laboratory of Radio Astronomy,Chinese Academy of Sciences 8.中国科学院南京天文光学技术研究所 9.School of Physics and State Key Laboratory of Nuclear Physics and Technology,Peking University 10.中国科学院大学
推荐引用方式 GB/T 7714	WeiYang Wang,JiGuang Lu,SongBo Zhang,et al. pulsargiantpulsecoherentinstabilitynearlightcylinder[J]. 中国科学物理学力学天文学英文版,2019,000(007):10.
APA	WeiYang Wang,JiGuang Lu,SongBo Zhang,XueLei Chen,Rui Luo,&RenXin Xu.(2019).pulsargiantpulsecoherentinstabilitynearlightcylinder.中国科学物理学力学天文学英文版,000(007),10.
MLA	WeiYang Wang,et al."pulsargiantpulsecoherentinstabilitynearlightcylinder".中国科学物理学力学天文学英文版 000.007(2019):10.