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摘要:
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。
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关键词:
- 电力线谐波辐射(PLHR) /
- 卫星探测 /
- 电离层测量 /
- 空间研究 /
- DEMETER
Abstract: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.
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图 1 典型PLHR事件自轨道高能电子变化
Figure 1. Energetic electron variation of a typical PLHR event in its self-orbit
图 2 典型PLHR事件自轨道与重访轨道的投掷角和电子通量的对比
Figure 2. Comparison of pitch angle and electron flux between self-orbit and revisiting orbits of typical PLHR event
图 3 轨道号为246730的PLHR事件的投掷角和电子通量的变化
Figure 3. Variation of pitch angle and electron flux of PLHR event on orbit 246730
表 1 典型PLHR事件的投掷角和电子通量的变化
Table 1. Variation of pitch angle and electron flux of typical PLHR event
高能电子参数 OR-1 OR OR+1 PLHR发生前 PLHR发生后 投掷角/(°) 81.871 81.861 81.874 不变 不变 低能带电子通量/(cm-2·s-1·sr-1·keV-1) 0.054 01 0.054 57 0.067 02 不变 增大 中能带电子通量/(cm-2·s-1·sr-1·keV-1) 0.008 06 0.007 69 0.007 52 不变 不变 高能带电子通量/(cm-2·s-1·sr-1·keV-1) 0.000 564 0.001 576 0.002 875 增大 增大 
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表 2 72例PLHR事件的投掷角和电子通量的变化
Table 2. Statistical results of pitch angle and electron flux variation of 72 PLHR events
变化趋势 投掷角 低能带电子通量 中能带电子通量 高能带电子通量 PLHR发生前 PLHR发生后 PLHR发生前 PLHR发生后 PLHR发生前 PLHR发生后 PLHR发生前 PLHR发生后 不变 61 61 21 23 44 50 7 7 增大 10 4 16 27 15 9 31 31 减小 1 7 35 22 13 13 34 34
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