Diffusion Coefficients, Short-Term Cosmic Ray Modulation, and Convected Magnetic Structures

Author:

Quenby John J.1,Mulligan Tamitha2,Blake J. Bernard2,Shaul Diana N. A.1

Affiliation:

1. Blackett Laboratory, Imperial College, London SW7 2BZ, UK

2. Space Sciences Department, The Aerospace Corporation, Los Angeles, CA 90009, USA

Abstract

Three cases of large-amplitude, small spatial-scale interplanetary particle gradients observed by the anticoincidence shield (ACS) aboard the INTEGRAL spacecraft in 2006 are investigated. The high data rates provided by the INTEGRAL ACS allow an unprecedented ability to probe the fine structure of GCR propagation in the inner Heliosphere. For two of the three cases, calculating perpendicular and parallel cosmic ray diffusion coefficients based on both field and particle data results in parallel diffusion appearing to satisfy a convection gradient current balance, provided that the magnetic scattering of the particles can be described by quasi-linear theory. In the third case, perpendicular diffusion seems to dominate. The likelihood of magnetic flux rope topologies within solar ejecta affecting the local modulation is considered, and its importance in understanding the field-particle interaction for the astrophysics of nonthermal particle phenomena is discussed.

Funder

Science & Technology Facilities Council

Publisher

Hindawi Limited

Subject

Space and Planetary Science,Astronomy and Astrophysics

Cited by 2 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Transient heliosheath modulation;Monthly Notices of the Royal Astronomical Society;2015-08-24

2. LISA Pathfinder test-mass charging during galactic cosmic-ray flux short-term variations;Classical and Quantum Gravity;2015-01-05

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