损失锥-束流分布电子驱动的回旋激射不稳定性

在Chen等理论模型的基础上，对损失锥-束流分布电子激发的回旋激射不稳定性的主要特征 进行了深入研究，这种电子分布在太阳色球附近的磁重联过程中可能形成，它兼有束流和损 失锥的特性.结果表明，它不仅可以像束流分布和损失锥分布那样在适当的等离子体频率和 回旋频率的比值范围内激发X模和O模的基频和谐频不稳定性，兼有两种分布的激发特性，而 且具有更强的增长率.这一方面丰富了此类等离子体不稳定性的基本内容，而且预期在天体 射电发射机理的研究中也将得到广泛的应用. 关键词： 回旋激射不稳定性 弱相对论性 损失锥-束流分布电子 增长率

Maser instability driven by an electron beam with losscone-beam distribution

The studies of the main characterestics of the maser-instability driven by elec trons with a losscone-beam distribution are carried out on the basis of the the oretical model of Chen et al (2002, Phys. Plasmas 9,2816; 2003, Acta Phys. S in.52,421). This kind of electrons may be created by the reconnection near the chromosphere of the sun. The electrons have the characters of both losscone and beam. The results show that it can excite the fundamental and harmonic radiatio n of extraordinary and ordinary modes in an appropriate region of plasma freque ncy over the gyrofrequency with the characters of both losscone and beam distri bution, and with much stronger growth rate. It enriches the fundamental content of the plasma instabilities. It is expected to be applicable widely in the stud y of solar and celestial emission mechanism.