摘要
本文讨论宽频带静电噪声对等离子体片边界层处粒子的随机加速问题.计算表明:宽频带静电噪声会使离子轨道在相空间Poincare截面上一定范围内无规行走,该范围与扰动电场的振幅、频率和波矢有关;引起的离子随机加速使一部离子能获得较高的能量,在等离子体片参数下预计最大能量可达1000keV量级;对电子,随机效应不明显.该结果为等离子体片中高能离子的存在这一长时观测特性提供一种新的可能产生机制.
In this paper the stochastic accelaration of ions in the plasma sheet boundary layer of the Earth's magnetotail by the broadband electrostatic noise is discussed. The calculations show that, due to the interaction with the noise, the trajectories of some ions in the phase space are stochastic. The area of the random motion in phase space is raleted to the amplitude, frequency and wave vector of the noise; through the stochastic accelaration, a part of the ions can be accelarated to the order of about 100 keV. These results may be used to explain the observations that some ions with very high energy exist in the plasma theet of the Earth magnetotail.
出处
《空间科学学报》
CAS
CSCD
北大核心
1989年第3期168-174,共7页
Chinese Journal of Space Science
基金
国家自然科学基金
