| DOI: | 10.1002/2014GL061869
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| 论文题名: | Modification of the loss cone for energetic particles |
| 作者: | Porazik P.; Johnson J.R.; Kaganovich I.; Sanchez E.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-9606
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| EISSN: | 1944-9337
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| 出版年: | 2014
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| 卷: | 41, 期:22 | | 起始页码: | 8107
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| 结束页码: | 8113
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| 语种: | 英语
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| 英文关键词: | beam injection from space
; energetic particle precipitation
; energetic particles
; loss cone
; magnetic mirror
; magnetic moment invariant
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| Scopus关键词: | Charged particles
; Magnetic fields
; Magnetic mirrors
; Magnetic moments
; Magnetism
; Magnetosphere
; Mirrors
; Orbits
; Analytic expressions
; Beam injection
; Energetic particles
; Magnetic field line
; Moment invariant
; Numerical integrations
; Optimal orientation
; Relativistic electron
; Magnetic bubbles
; electron
; gene expression
; magnetic field
; magnetosphere
; mathematical analysis
; particulate matter
; precipitation (chemistry)
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| 英文摘要: | The optimal pitch angle which maximizes the penetration distance, along the magnetic field, of relativistic charged particles injected from the midplane of an axisymmetric field is investigated analytically and numerically. Higher-order terms of the magnetic moment invariant are necessary to correctly determine the mirror point of trapped energetic particles, and therefore the loss cone. The modified loss cone resulting from the inclusion of higher-order terms is no longer entirely defined by the pitch angle but also by the phase angle of the particle at the point of injection. The optimal orientation of the injection has a nonzero component perpendicular to the magnetic field line, and is in the plane tangential to the flux surface. Numerical integration of particle orbits were carried out for a relativistic electron in a dipole field, showing agreement with analytic expressions. The results are relevant to experiments, which are concerned with injection of relativistic beams into the atmosphere from aboard a spacecraft in the magnetosphere. © 2014. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84923334373&doi=10.1002%2f2014GL061869&partnerID=40&md5=4cd9bdf11ddf75e5520dd2c537cf050f
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| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/6870
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| Appears in Collections: | 气候减缓与适应
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作者单位: | Princeton Center for Heliophysics, Plasma Physics Laboratory, Princeton University, Princeton, NJ, United States
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| Recommended Citation: | |
Porazik P.,Johnson J.R.,Kaganovich I.,et al. Modification of the loss cone for energetic particles[J]. Geophysical Research Letters,2014-01-01,41(22).
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