太阳风里高能电子自发辐射的Langmuir波

LANGMUIR WAVES SPONTANEOUSLY EMITTED BY ENERGETIC ELECTRONS IN THE SOLAR WIND

本文讨论太阳风里太阳耀班高能电子产生的Ｌａｎｇｍｕｉｒ波的自发辐射．理论估计得出，在时间尺度γｋｍ－１内，Ｌａｎｇｍｕｉｒ波自发辐射的电场幅值约为１０－３－１０－２ｍＶ／ｍ（依赖于高能电子速度分布的具体形式），这里γｋｍ为在波数ｋ处的峰增长率．此理论结果比飞船在太阳风里的观测值低２—３个数量级．因此认为，太阳风里自发辐射产生的Ｌａｎｇｍｕｉｒ波辐射是可以忽略的．

In this paper, the spontaneous emission of Langmuir waves is discuss due to energetic electrons produced by solar flares in the solar wind. It is found that the electric field of the spontaneously emitted Langmuir waves can be as large as 10-3-10-2mV/m (depending upon the distribution of the electrons),if considering a characteristic time of γkm-1, where γkm is the peak growth rate. This results is a great deal lower than the electric field associated with Langmuir waves observed with spacecraft in the solar wind. Thus, compared with induced processes,the spontaneous emission of Langmuir waves in general is negligible.