电力线谐波辐射对电离层高能电子的影响

电力线谐波辐射（PLHR）作为一种人为的电离层电磁环境污染源被广泛认可，其对电离层状态的影响亟待研究。基于DEMETER卫星高能粒子探测器（IDP）的数据，采用PLHR事件自轨道和发生前后重访轨道综合分析的方法，研究了中国电离层中发现的72例PLHR事件发生前后电离层高能电子投掷角、低中高3个能带的电子通量的影响。结果表明，在PLHR发生前极少数事件出现了投掷角增大的现象，且低能带的电子通量倾向于减小的趋势。这可能是PLHR产生的影响，也可能是由于电离层高能电子状态的这种变化导致PLHR更容易被探测到。

Influence of power line harmonic radiation on ionospheric energetic electrons

As a man-made pollutant to the ionospheric electromagnetic environment, power line harmonic radiation (PLHR) is widely known in these years. It is urgent to conduct research of the influence of PLHR on ionospheric state parameter variation. Based on the observed data of instrument for detection of particles (IDP) onboard DEMETER, by combination analysis on self-orbit and revisiting orbits of PLHR, we statistically studied the variation of pitch angles and energetic electron fluxes of low, middle and high energy bands before and after 72 PLHR events detected in the ionosphere above China. The results show that before PLHR a few events show pitch angle scattering, and the energetic electron fluxes of low energy band tend to decrease. This may be due to the influence of PLHR, or due to this state variation of ionospheric energetic electrons which leads to the easy detection of PLHR.