期刊
ASTROPHYSICAL JOURNAL
卷 778, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/778/2/180
关键词
diffusion; magnetic fields; methods: data analysis; methods: numerical; Sun: heliosphere
资金
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico [140441/2006-9, CNPq/PQ 301233/2011-0, 305373/2012-2]
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES)
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo [2008/01288-0]
- National Academy of Sciences, India, for support under NASI-Senior Scientist Platinum Jubilee Fellowship and FAPESP [2012/05397-3]
Magnetic field magnitude decreases (MDs) are observed in several regions of the interplanetary medium. In this paper, we characterize MDs observed by the Ulysses spacecraft instrumentation over the solar south pole by using magnetic field data to obtain the empirical size, magnetic field MD, and frequency of occurrence distribution functions. The interaction of energetic (100 keV to 2 MeV) protons with these MDs is investigated. Charged particle and MD interactions can be described by a geometrical model allowing the calculation of the guiding center shift after each interaction. Using the distribution functions for the MD characteristics, Monte Carlo simulations are used to obtain the cross-field diffusion coefficients as a function of particle kinetic energy. It is found that the protons under consideration cross-field diffuse at a rate of up to approximate to 11% of the Bohm rate. The same method used in this paper can be applied to other space regions where MDs are observed, once their local features are well known.
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