光学天文与技术应用研究室知识库

电子回旋脉泽辐射是天体射电辐射的一个重要机制，被广泛应用于解释各种相干射电爆发现象。以往的研究中，激发脉泽不稳定性的一个关键条件就是高能电子具有各向异性的速度分布。然而，观测显示太阳和其他天体的高能电子常常呈现具有低能截止行为的幂律谱分布。我们研究了温度各向异性和具有低能截止行为的温度各向异性对回旋脉泽不稳定性的驱动，结果显示幂律谱电子的低能截止行为对不稳定性具有重要的影响。

The electron-cyclotron maser emission (ECME) is one of the most important radio emission mechanisms in astrophysics. It has been extensively applied to various coherent radio-burst phenomena. Most discussions on the ECME suppose that the energetic electrons have an anisotropy distribution in the velocity space. However, observations from hard X-ray demonstrate that energetic flare-electrons frequently present a power-law distribution with a lower-energy cutoff. In this paper, we consider the ECM instability driven by temperature anisotropy and by lower-energy cutoff behavior and temperature anisotropy, respectively. The results show that the lower-energy cutoff behavior has an important effect on the ECME driven by the temperature anisotropy.