首页> 外文期刊>The Astrophysical journal >Electron Acceleration by Lower Hybrid Turbulence in Solar Flares
【24h】

Electron Acceleration by Lower Hybrid Turbulence in Solar Flares

机译:太阳耀斑中较低混合湍流的电子加速

获取原文
           

摘要

The origin of the energetic particles associated with solar flares is a challenge to solar plasma theory. In this paper, we investigate the feature of stochastic acceleration of electrons by lower hybrid (LH) turbulence, which is a possible mechanism for the energization of relativistic electrons. The transport and acceleration parameters are studied with the Fokker-Planck coefficients Dμμ, Dμp, and Dpp, obtained from the quasi-linear method under the test particle assumption. Using the analytic expressions of the diffusion coefficients, we obtain the aspects of electron acceleration by LH turbulence, such as the acceleration and scattering timescales. The results show that the acceleration time of an original thermal electron over 20 keV is less than 1 s, which is required by hard X-ray observations during impulsive flares. However, the isotropy of the pitch-angle distribution cannot be maintained, and high-energy (~100 MeV) acceleration is inefficient. Some results of different plasma cases are compared, which are helpful in the understanding of particle acceleration in solar flares.
机译:与太阳耀斑有关的高能粒子的起源是对太阳等离子体理论的挑战。在本文中,我们研究了由低混合(LH)湍流引起的电子随机加速的特征,这是相对论电子通电的一种可能机制。在测试粒子假设下,使用准线性方法获得的Fokker-Planck系数Dμμ,Dμp和Dpp研究了运输和加速参数。使用扩散系数的解析表达式,我们获得了由LH湍流引起的电子加速方面,例如加速和散射时标。结果表明,原始热电子在20 keV以上的加速时间小于1 s,这是在脉冲耀斑中进行硬X射线观察所需的。但是,无法保持俯仰角分布的各向同性,并且高能(〜100 MeV)加速效率不高。比较了不同等离子体情况下的一些结果,这有助于理解太阳耀斑中的粒子加速。

著录项

获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号