Termination shock particle spectral features

被引：0

作者：

Cummings, A. C. ^{[1
]}

Stone, E. C. ^{[1
]}

McDonald, F. B. ^{[2
]}

Heikkila, B. C. ^{[3
]}

Lal, N. ^{[3
]}

Webber, W. R. ^{[4
]}

机构：

[1] CALTECH, Mail Code 220-47, Pasadena, CA 91125 USA

[2] Univ Maryland, Inst Physi Sci & Technol, College Pk, MD 20742 USA

[3] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

[4] New Mexico State Univ, Dept Phys & Astron, Las Cruces, NM 88003 USA

来源：

PHYSICS OF THE INNER HELIOSHEATH: VOYAGER OBSERVATIONS, THEORY, AND FUTURE PROSPECTS | 2006年 / 858卷

关键词：

anomalous cosmic rays; solar wind termination shock; Voyager; shock acceleration;

D O I：

暂无

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Spectral features of energetic H ions accelerated at the termination shock may be evidence of two components. At low energies the energy spectrum is similar to E-1.55, with break at similar to 0.4 MeV to E-2.2. A second component appears above similar to 1 MeV with a spectrum of E-1.27 with a break at similar to 3.2 MeV. Even though the intensities upstream are highly variable, the same spectral break energies are observed, suggesting that these are durable features of the source spectrum. The acceleration processes for the two components may differ, with the lower energy component serving as the injection source for diffusive shock acceleration of the higher energy component. Alternatively, the spectral features may result from the energy dependence of the diffusion tensor that affects the threshold for diffusive shock acceleration.

引用

页码：86 / +

页数：2

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