低电离层舒曼谐振观测
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摘要
舒曼谐振与大气温度变化及地震电磁前兆密切相关,该文针对地面直接观测受环境制约严重的问题,提出了一种新的舒曼谐振监测方法,即人工向电离层发射高频(HF)电磁波,与舒曼谐振产生电离层交叉调制,通过解调HF波获得舒曼谐振。基于大气晴天电场作用下HF电磁波与舒曼谐振在低电离层的非线性调制模型,论证了该方法的可行性;利用我国首个舒曼谐振观测台站,接收短波授时信号BPM,并在其解调谱图上得到了分别位于7Hz,14Hz,20Hz,26Hz的舒曼谐振前4阶谐振峰。理论及实验表明在HF的解调谱上获取低电离层舒曼谐振,是一种可行的舒曼谐振观测方式。
Schumann Resonance (SR) is closely related with atmospheric temperature changes and electromagnetic precursors of earthquakes.In this paper,a new method to monitor SR is proposed as the heavy environment constraints in the ground-based observing.That is to transmit High Frequency (HF) electromagnetic waves into the ionosphere,where the HF signals will be cross-modulated with SR.So it can be obtained by de-modulating the HF waves.The feasibility of the experiment is verified based on the nonlinear modulation model of HF waves and SR in the lower ionosphere,in which the fair weather electric filed is taken into account.The first 4 peaks of Schumann resonance respectively at 7 Hz,14 Hz,20 Hz,26 Hz are obtained in demodulation spectra of short wave timing signal BPM at the first Schumann Resonance observatory of China.The theoretical and experimental results show that it is feasible to get SR signals in the lower ionosphere from the HF demodulation spectra.
Schumann Resonance (SR) is closely related with atmospheric temperature changes and electromagnetic precursors of earthquakes.In this paper,a new method to monitor SR is proposed as the heavy environment constraints in the ground-based observing.That is to transmit High Frequency (HF) electromagnetic waves into the ionosphere,where the HF signals will be cross-modulated with SR.So it can be obtained by de-modulating the HF waves.The feasibility of the experiment is verified based on the nonlinear modulation model of HF waves and SR in the lower ionosphere,in which the fair weather electric filed is taken into account.The first 4 peaks of Schumann resonance respectively at 7 Hz,14 Hz,20 Hz,26 Hz are obtained in demodulation spectra of short wave timing signal BPM at the first Schumann Resonance observatory of China.The theoretical and experimental results show that it is feasible to get SR signals in the lower ionosphere from the HF demodulation spectra.
引文
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[4]Hayakawa M,Nickolaenko A P,and Sekiguchi M,et al..Anomalous elf phenomena in the schumann resonance band as observed at moshiri(japan)in possible association with an earthquake in taiwan.Natural Hazards and Earth System Sciences,2008,8(6):1309-1316.
[5]Ohta K,Izutsu J,and Hayakawa M.Anomalous excitation of schumann resonances and additional anomalous resonances before the2004mid-niigata prefecture earthquake and the2007noto hantou earthquake.Physics and Chemistry of the Earth,Parts A/B/C,2009,34(6-7):441-448.
[6]Ohta K,Watanabe N,and Hayakawa M,et al..Electromagnetic fields and schumann resonance on taiwai earthquakes.in Electromagnetic Compatibility2004,17th International Wroclaw Symposium and Exhibition.Poland,2004.
[7]Ohta K,Watanabe N,and Hayakawa M.Survey of anomalous schumann resonance phenomena observed in japan,in possible association with earthquakes in taiwan.Physics and Chemistry of the Earth,Parts A/B/C,2006,31(4-9):397-402.
[8]Hayakawa M,Ohta K,and Nickolaenko A P,et al..Anomalous effect in schumann resonance phenomena observed in japan,possibly associated with the chi-chi earthquake in taiwan.Annales Geophysicae,2005,23(4):1335-1346.
[9]Nickolaenko A P,Hayakawa M,and Sekiguchi M,et al..Model modifications in schumann resonance intensity caused by a localized ionosphere disturbance over the earthquake epicenter.Annales Geophysicae,2006,24(2):567-575.
[10]曹丙霞,乔晓林.基于地球-电离层空腔共振的地震电磁监测方法研究.国际地震动态,2009,(7):22-26.
[11]Alpert Y L.Propagation of electromagnetic waves and the ionosphere.Nauka,1972,1(1):563.
[12]Yampolski Y M,Bliokh P V,and Beley V S,et al..Non-linear interaction between schumann resonances and hf signals.Journal of Atmospheric and Solar-Terrestrial Physics,1997,59(3):335-342.
[13]Nickolaenko A P and Hayakawa M.Resonances in the Earth-Ionosphere Cavity.Netherlands:Kluwer Academic Publishers.2002:156-169.
[14]Gurevich A V.Nonlinear Phenomena in the Ionosphere.New York:Springer.1978:113-114.
[15]肖景明,王元坤.电波传播工程计算.西安:西安电子科技大学出版社,1989:47-48.
[2]Morente J A,Port J A,and Salinas A,et al..Evidence of electrical activity on titan drawn from the schumann resonances sent by huygens probe.International Journal of Solar System Studies,2008,195(2):802-811.
[3]Nieckarz Z,Kulak A,and Zieba S,et al..Comparison of global storm activity rate calculated from schumann resonance background components to electric field intensity E0Z.Atmospheric Research,2009,91(2-4):184-187.
[4]Hayakawa M,Nickolaenko A P,and Sekiguchi M,et al..Anomalous elf phenomena in the schumann resonance band as observed at moshiri(japan)in possible association with an earthquake in taiwan.Natural Hazards and Earth System Sciences,2008,8(6):1309-1316.
[5]Ohta K,Izutsu J,and Hayakawa M.Anomalous excitation of schumann resonances and additional anomalous resonances before the2004mid-niigata prefecture earthquake and the2007noto hantou earthquake.Physics and Chemistry of the Earth,Parts A/B/C,2009,34(6-7):441-448.
[6]Ohta K,Watanabe N,and Hayakawa M,et al..Electromagnetic fields and schumann resonance on taiwai earthquakes.in Electromagnetic Compatibility2004,17th International Wroclaw Symposium and Exhibition.Poland,2004.
[7]Ohta K,Watanabe N,and Hayakawa M.Survey of anomalous schumann resonance phenomena observed in japan,in possible association with earthquakes in taiwan.Physics and Chemistry of the Earth,Parts A/B/C,2006,31(4-9):397-402.
[8]Hayakawa M,Ohta K,and Nickolaenko A P,et al..Anomalous effect in schumann resonance phenomena observed in japan,possibly associated with the chi-chi earthquake in taiwan.Annales Geophysicae,2005,23(4):1335-1346.
[9]Nickolaenko A P,Hayakawa M,and Sekiguchi M,et al..Model modifications in schumann resonance intensity caused by a localized ionosphere disturbance over the earthquake epicenter.Annales Geophysicae,2006,24(2):567-575.
[10]曹丙霞,乔晓林.基于地球-电离层空腔共振的地震电磁监测方法研究.国际地震动态,2009,(7):22-26.
[11]Alpert Y L.Propagation of electromagnetic waves and the ionosphere.Nauka,1972,1(1):563.
[12]Yampolski Y M,Bliokh P V,and Beley V S,et al..Non-linear interaction between schumann resonances and hf signals.Journal of Atmospheric and Solar-Terrestrial Physics,1997,59(3):335-342.
[13]Nickolaenko A P and Hayakawa M.Resonances in the Earth-Ionosphere Cavity.Netherlands:Kluwer Academic Publishers.2002:156-169.
[14]Gurevich A V.Nonlinear Phenomena in the Ionosphere.New York:Springer.1978:113-114.
[15]肖景明,王元坤.电波传播工程计算.西安:西安电子科技大学出版社,1989:47-48.
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