Power requirements for cosmic ray propagation models involving diffusive reacceleration; estimates and implications for the damping of interstellar turbulence

被引：52

作者：

Drury, Luke O'C. ^{[1
]}

Strong, Andrew W. ^{[2
]}

机构：

[1] Dublin Inst Adv Studies, Sch Cosmic Phys, 31 Fitzwilliam Pl, Dublin 2, Ireland

[2] MPI Extraterrestr Phys, Postfach 1312, D-85741 Garching, Germany

来源：

ASTRONOMY & ASTROPHYSICS | 2017年 / 597卷

关键词：

cosmic rays; ISM: structure; turbulence; acceleration of particles; BAYESIAN-ANALYSIS; ALFVEN WAVES; MILKY-WAY; ACCELERATION; PARTICLES; PROTONS;

D O I：

10.1051/0004-6361/201629526

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We make quantitative estimates of the power supplied to the Galactic cosmic ray population by second-order Fermi acceleration in the interstellar medium, or as it is usually termed in cosmic ray propagation studies, diffusive reacceleration. Using recent results on the local interstellar spectrum, following Voyager 1's crossing of the heliopause, we show that for parameter values, in particular the Alfven speed, typically used in propagation codes such as GALPROP to fit the B/C ratio, the power contributed by diffusive reacceleration is significant and can be of order 50% of the total Galactic cosmic ray power. The implications for the damping of interstellar turbulence are briefly considered.

引用

页数：5

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