全球电离层VLF电场功率谱特征
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摘要
分析2006年3月至2009年2月DEMETER卫星VI.F电场功率谱数据发现,卫星高度上全球电离层电场功率谱有以下特征:高纬度区域电场辐射强度平均高于低纬度区域,几个地磁场异常区相应的电场辐射增强;全球电场功率谱,向阳侧强于夜侧,大陆强于海洋,夏季强于分点季,冬季最弱;不同频段的电场功率谱特征有显著差异,某些频段的功率谱有明显沿磁壳指数L线或地磁场线分布的特征;此外,不同年份、相同季节的电场功率谱全球分布特征及功率谱强度有较高相似度。该电离层全球观测模型将为地震电离层异常分析研究提供背景依据。
By analyzing the electric field power spectrum data observed by the DEMETER satellite during the time interval of March 2006 and February 2009,it is found that the characteristics of Electric field power spectrum of global ionosphere in DEMETER altitude are as follows: electric field emission is more stronger in the region with high latitude than that in the low latitude in average,furthermore,the electric field emission enhanced corresponding to several geomagnetic field abnormal regions;global electric field power spectrum intensity is stronger on the dayside than on the nightside,stronger over the continents than over the ocean, stronger in the summer than in the equinoctial season,and the weakest in the winter;there exist prominent difference of electric field power spectrum in different frequency band,meanwhile, power spectrum distributes visibly along the magnetic shell index L shells or geomagnetic field intensity lines in some frequency bands;moreover,the global characteristics are more similar in the same season of different years.This global observation model will provide a basis for the study of ionosphere anomalies induced by seismic activity.
By analyzing the electric field power spectrum data observed by the DEMETER satellite during the time interval of March 2006 and February 2009,it is found that the characteristics of Electric field power spectrum of global ionosphere in DEMETER altitude are as follows: electric field emission is more stronger in the region with high latitude than that in the low latitude in average,furthermore,the electric field emission enhanced corresponding to several geomagnetic field abnormal regions;global electric field power spectrum intensity is stronger on the dayside than on the nightside,stronger over the continents than over the ocean, stronger in the summer than in the equinoctial season,and the weakest in the winter;there exist prominent difference of electric field power spectrum in different frequency band,meanwhile, power spectrum distributes visibly along the magnetic shell index L shells or geomagnetic field intensity lines in some frequency bands;moreover,the global characteristics are more similar in the same season of different years.This global observation model will provide a basis for the study of ionosphere anomalies induced by seismic activity.
引文
曹晋滨,燕春晓,路立,杨俊英,李柳元.地球近地空间非震电磁扰动[J].地震,2009,29(Supp):17-25．
徐文耀.地球电磁现象物理学[M].合肥:中国科学技术大学出版社,2009．
张瑜.电磁波空间传播[M].西安电子科技大学出版社,2007．
Benck S,Cyamukungu M,Cabrera J.Study of correlations between waves and particle fluxes measured on board the DEMETER satellitc[J].Advances in Space Research,2008,doi:10． 1016/j.asr.2008,03． 024．
erthelier J J,et al.ICE,the electric field experiment on DEMETER[J].Planet Space Sci,2006,54,456-471．
Gokhberg M B,Morgounov V A,Yoshino T and Tomizawa L.Experimental Measurement of Electromagnetic Emissions Possibly Related to Earthquakes in Japan[J].J Geophys Res,1982,87(B9) :7 824-7 828．
Green J L,Boardsen S,Garcia L,Taylor W W L,Fung S F and Reinisch B W.On the origin of whistler mode radiation in the plasmasphere[J].J Geophys Res,2005,110:A03201．
Molchanov O A,Mazhacva O A,Goliavin A N and Hayakawa M.Observation by the Intercosmos-24 satellite of ELF-VLF electromagnetic emissions associated with earthquakes[J].Ann Geophys,1993,11:431-440．
Molchanov O,et al.Global diagnostics of the ionospheric perturbations related to the seismic activity using the VLF radio signals collected on the DEMETER satellite[J].Nat Hazards Earth Syst Sci,2006,6:745-753．
Nemec F,Santolik O and Parrot M.Decrease of intensity of ELF/VLF waves observed in the upper ionosphere close to earthquakes:A statistical study[J].J Geophys Res,2009,114:A04303．
Nemec F,Santolik O,Parrot M and Berthelier J J.Spacecraft observations of electromagnetic perturbations connected with seismic activity[J].Geophys Res Lett,2008,35:L05109．
Parrot M and Mogilevsky M M.VLF emissions associated with earthquakes and observed in the ionosphere and the magnetosphere[J].Physics of The Earth and Planetary Interiors,1989,57(1-2) :86-99．
Parrot M.Statistical study of ELF/VLF emissions recorded by a low-altitude satellite during seismic events[J].J Geophys Res,1994,99(A12) :23 339-23 347．
徐文耀.地球电磁现象物理学[M].合肥:中国科学技术大学出版社,2009．
张瑜.电磁波空间传播[M].西安电子科技大学出版社,2007．
Benck S,Cyamukungu M,Cabrera J.Study of correlations between waves and particle fluxes measured on board the DEMETER satellitc[J].Advances in Space Research,2008,doi:10． 1016/j.asr.2008,03． 024．
erthelier J J,et al.ICE,the electric field experiment on DEMETER[J].Planet Space Sci,2006,54,456-471．
Gokhberg M B,Morgounov V A,Yoshino T and Tomizawa L.Experimental Measurement of Electromagnetic Emissions Possibly Related to Earthquakes in Japan[J].J Geophys Res,1982,87(B9) :7 824-7 828．
Green J L,Boardsen S,Garcia L,Taylor W W L,Fung S F and Reinisch B W.On the origin of whistler mode radiation in the plasmasphere[J].J Geophys Res,2005,110:A03201．
Molchanov O A,Mazhacva O A,Goliavin A N and Hayakawa M.Observation by the Intercosmos-24 satellite of ELF-VLF electromagnetic emissions associated with earthquakes[J].Ann Geophys,1993,11:431-440．
Molchanov O,et al.Global diagnostics of the ionospheric perturbations related to the seismic activity using the VLF radio signals collected on the DEMETER satellite[J].Nat Hazards Earth Syst Sci,2006,6:745-753．
Nemec F,Santolik O and Parrot M.Decrease of intensity of ELF/VLF waves observed in the upper ionosphere close to earthquakes:A statistical study[J].J Geophys Res,2009,114:A04303．
Nemec F,Santolik O,Parrot M and Berthelier J J.Spacecraft observations of electromagnetic perturbations connected with seismic activity[J].Geophys Res Lett,2008,35:L05109．
Parrot M and Mogilevsky M M.VLF emissions associated with earthquakes and observed in the ionosphere and the magnetosphere[J].Physics of The Earth and Planetary Interiors,1989,57(1-2) :86-99．
Parrot M.Statistical study of ELF/VLF emissions recorded by a low-altitude satellite during seismic events[J].J Geophys Res,1994,99(A12) :23 339-23 347．
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