期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 719, 期 2, 页码 L190-L193出版社
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/719/2/L190
关键词
solar wind; waves
资金
- Aberystwyth University and the University of Science and Technology of China
- NNSFC [40825014, 40890162, 40904047, 40931053]
Using one-dimensional test particle simulations, the effect of a kinetic Alfven wave on the velocity distribution function (VDF) of protons in the collisionless solar wind is investigated. We first use linear Vlasov theory to numerically obtain the property of a kinetic Alfven wave (the wave propagates in the direction almost perpendicular to the background magnetic field). We then numerically simulate how the wave will shape the proton VDF. It is found that Landau resonance may be able to generate two components in the initially Maxwellian proton VDF: a tenuous beam component along the direction of the background magnetic field and a core component. The streaming speed of the beam relative to the core proton component is about 1.2-1.3 Alfven speed.
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