电力线谐波辐射对电离层高能电子的影响
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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。
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.
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.
引文
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[16]NEMEC F,CIZEK K,PARROT M,et al.Line radiation events induced by very low frequency transmitters observed by the DE-METER spacecraft[J].Journal of Geophysical Research Space Physics,2017,122(7):7226-7239.
[17]SAUVAUD J A,MOREAU T,MAGGIOLO R,et al.High-energy electron detection onboard DEMETER:The IDP spectrometer,description and first results on the inner belt[J].Planetary and Space Science,2006,54(5):502-511.
[18]欧阳新艳,张学民,申旭辉,等.普洱地震前电离层电子密度扰动变化研究[J].地震学报,2008,30(4):424-436.OUYANG X Y,ZHANG X M,SHEN X H,et al.Study on ionospheric Nedisturbances before 2007 Pu’er,Yunnan of China,earthquake[J].Acta Seismologica Sinica,2018,30(4):424-436(in Chinese).
[19]颜蕊,王兰炜,张世中,等.空基和地基近直流电场观测数据背景特征的相关性[J].地球物理学报,2013,56(4):1262-1273.YAN R,WANG L W,ZHANG S Z,et al.Correlation of near DCelectric field background characteristic between space-based and ground-based observational data[J].Chinese Journal of Geophysics,2013,56(4):1262-1273(in Chinese).
[20]IMHOF W L,REAGAN J B,VOSS H D,et al.Direct observation of radiation belt electrons precipitated by the controlled injection of VLF signals from a ground-based transmitter[J].Geophysical Research Letters,1983,10(4):361-364.
[2]PARROT M.DEMETER observations of manmade waves that propagate in the ionosphere[J].Comptes Rendus Physique,2018,19(1-2):26-35.
[3]HELLIWELL R A,KATSUFRAKIS J P,BELL T F,et al.VLFline radiation in the earth’s magnetosphere and its association with power system radiation[J].Journal of Geophysical Research,1975,80(31):4249-4258.
[4]HELLIWELL R A,CARPENTER D L,MILLER T R.Power threshold for growth of coherent VLF signals in the magnetosphere[J].Journal of Geophysical Research,1980,85(A7):3360-3366.
[5]WERNER S M,RODGER C J,THOMSON N R.Identifying power line harmonic radiation from an electrical network[J].Annales Geophysicae,2005,23(6):2107-2116.
[6]NEMEC F,SANTOLIK O,PARROT M,et al.Power line harmonic radiation(PLHR)observed by the DEMETER spacecraft[J].Journal of Geophysical Research,2006,111(A4):A04308.
[7]NEMEC F,PARROT M,SANTOLIK O.Influence of power line harmonic radiation on the VLF wave activity in the upper ionosphere:Is it capable to trigger new emissions?[J].Journal of Geophysical Research,2010,115(A11):A11301.
[8]ONISHI T,PARROT M,BERTHELIER J J.The DEMETERmission,recent investigations on ionospheric effects associated with man-made activities and seismic phenomena[J].Comptes Rendus Physique,2011,12(2):160-170.
[9]WU J,ZHANG C,ZENG L,et al.Systematic investigation of power line harmonic radiation in near-earth space above China based on observed satellite data[J].Journal of Geophysical Research Space Physics,2017,122(3):3448-3458.
[10]PARROT M,ZASLAVSKI Y.Physical mechanisms of manmade influences on the magnetosphere[J].Surveys in Geophysics,1996,17(1):67-100.
[11]BULLOUGH K.Power line harmonic radiation(sources and environmental effects)[M]∥VOLLAND H.Handbook of atomspheric electrodynamics.Vol.2.Boca Raton,FL:CRC Press,1995:291-332.
[12]吴静,付静静.地震电磁卫星监测输电线谐波辐射研究综述[J].地震学报,2011,33(6):828-836.WU J,FU J J.A review on power line harmonic radiation monitored by DEMETER satellite[J].Acta Seismologica Sinica,2011,33(6):828-836(in Chinese).
[13]PARROT M,NEMEC F,SANTOLIK O.Statistical analysis of VLF radio emissions triggered by power line harmonic radiation and observed by the low-altitude satellite DEMETER[J].Journal of Geophysical Research Space Physics,2014,119(7):5744-5754.
[14]WHITTAKER I C,GAMBLE R J,RODGER C J,et al.Determining the spectra of radiation belt electron losses:Fitting DEME-TER electron flux observations for typical and storm times[J].Journal of Geophysical Research Space Physics,2013,118(12):7611-7623.
[15]李新乔,马宇蒨,王焕玉,等.空间电磁卫星的粒子探测与汶川地震[J].地球物理学报,2010,53(10):2337-2344.LI X Q,MA Y Q,WANG H Y,et al.Observation of particle on space electro-magnetic satellite during Wenchuan earthquake[J].Chinese Journal of Geophysics,2010,53(10):2337-2344(in Chinese).
[16]NEMEC F,CIZEK K,PARROT M,et al.Line radiation events induced by very low frequency transmitters observed by the DE-METER spacecraft[J].Journal of Geophysical Research Space Physics,2017,122(7):7226-7239.
[17]SAUVAUD J A,MOREAU T,MAGGIOLO R,et al.High-energy electron detection onboard DEMETER:The IDP spectrometer,description and first results on the inner belt[J].Planetary and Space Science,2006,54(5):502-511.
[18]欧阳新艳,张学民,申旭辉,等.普洱地震前电离层电子密度扰动变化研究[J].地震学报,2008,30(4):424-436.OUYANG X Y,ZHANG X M,SHEN X H,et al.Study on ionospheric Nedisturbances before 2007 Pu’er,Yunnan of China,earthquake[J].Acta Seismologica Sinica,2018,30(4):424-436(in Chinese).
[19]颜蕊,王兰炜,张世中,等.空基和地基近直流电场观测数据背景特征的相关性[J].地球物理学报,2013,56(4):1262-1273.YAN R,WANG L W,ZHANG S Z,et al.Correlation of near DCelectric field background characteristic between space-based and ground-based observational data[J].Chinese Journal of Geophysics,2013,56(4):1262-1273(in Chinese).
[20]IMHOF W L,REAGAN J B,VOSS H D,et al.Direct observation of radiation belt electrons precipitated by the controlled injection of VLF signals from a ground-based transmitter[J].Geophysical Research Letters,1983,10(4):361-364.