Alfven脉动串级加热加速太阳风的二元流体模型  

A TWO-FLUID MODEL OF SOLAR WIND FOR ACCELERATING AND HEATING

作　　者：卢先和[1] 涂传诒[1] 

机构地区：[1]北京大学地球物理系

出　　处：《地球物理学报》1997年第1期1-9,共9页Chinese Journal of Geophysics

基　　金：国家自然科学基金

摘　　要：为研究太阳风的加速及加热机制，本又提出计算太阳风加速与加热的二元流体模型．该模型是建立在涂传治等提出的Alfven脉动的波能本级理论的基础上的．它能够描述从1Rs到1AU空间范围内太阳风的加速与加热，特别是它能够描述Alfven脉动的主要特性和Helios卫星对0.29－IAU空间范围内太阳风高速流的观测．上述结果说明Alfven波对太阳风的加速和加热有着十分重要的作用，并为研究太阳风的起源提供理论依据．A two-fluid model has been developed by including in the model the Alfvenic fluctuation power spectrum equation proposed by Professor Tu. In this model, theheating and accelerating of the solar wind can be described by a single process forwhole space range from 1Rs to 1AU. Especially for heliocentric distance r< 10Rs, themodel can characterize heating of proton and changing of proton temperature withradial distance r, and it can depict the major properities of Alfvenic fluctuation andthe high-speed flow observed by Helios in the space range between 0.29-1AU. Thesolutions are consistent with the observational constraints, and we can obtain the following conditions.(1) The spectrum index of the fluctuation is near to-1 for a large of frequencyat r=2R(2) The frequency range with -1 index becomes narrower with increasing r anddisappears near 1AU.(3) The temperature of proton is higher than of electron for whole space rangefrom 1Rs to 1AU, and the temperature of proton is less 3.0×105K at 1AU, thetemperature of electron is higher than 1.0×105K at 1AU.(4) The particle flux density at 1AU is not greater than 3.0×108cm-2.

关 键 词：太阳风 脉动串级 加热 加速 二元流体 流体模型 

分 类 号：P353.8[天文地球—空间物理学]