Effect of adiabatic cooling on the fitted parallel mean free path of solar energetic particles

	Effect of adiabatic cooling on the fitted parallel mean free path of solar energetic particles
	Qin, G.
刊名	Journal of Geophysical Research-Space Physics
	2006
卷号	111 期号:A8 页码:A08101
关键词	random magnetic-fields interplanetary transport charged-particles cosmic-rays diffusion model propagation turbulence protons deceleration
ISSN号	0148-0227
通讯作者	北京8701信箱
英文摘要	The focused transport equation without adiabatic energy loss is widely used to model solar energetic particles' (SEP) interplanetary propagation by fitting spacecraft data. We incorporate the adiabatic energy loss effect, provided by the divergence of the solar wind flows, into the focused transport equation. The equation is then solved numerically using a time-backward stochastic integration method. We show the comparison between solutions of focused transport equations with and without energy loss. We found the effect of adiabatic cooling is significant on the time profile of the intensity of SEPs. It is also shown that without energy loss, for gradual events, we can only fit the initial phase of SEP events. However, with energy loss, we can fit the entire ( initial and decaying) phases. In addition, the values of the mean free path obtained by fitting the SEP events with energy loss is always smaller than that without. The results suggest that including adiabatic cooling effect is another way to partially fix the solar energetic particle mean free paths' "too small'' problem discussed by Bieber et al. ( 1994), i.e., the mean free paths obtained by fitting transport equation to observation data are much larger than the quasi-linear theory results.
学科主题	空间物理
收录类别	SCI
原文出处	http://www.agu.org/pubs/crossref/2006/2005JA011512.shtml
语种	英语
内容类型	期刊论文
源URL	[http://ir.cssar.ac.cn/handle/122/1045]
专题	国家空间科学中心_空间科学部
推荐引用方式 GB/T 7714	Qin, G.. Effect of adiabatic cooling on the fitted parallel mean free path of solar energetic particles[J]. Journal of Geophysical Research-Space Physics,2006,111(A8):A08101.
APA	Qin, G..(2006).Effect of adiabatic cooling on the fitted parallel mean free path of solar energetic particles.Journal of Geophysical Research-Space Physics,111(A8),A08101.
MLA	Qin, G.."Effect of adiabatic cooling on the fitted parallel mean free path of solar energetic particles".Journal of Geophysical Research-Space Physics 111.A8(2006):A08101.