搜索结果: 16-30 共查到“理学 VLF”相关记录34条 . 查询时间(0.072 秒)
Experience of short term earthquake precursors with VLF–VHF electromagnetic emissions
short term earthquake precursors VLF–VHF electromagnetic emissions
2009/12/11
Electromagnetic anomalies (EMA) covering a wide range of frequencies from ULF, VLF up to VHF have been observed before recent destructive earthquakes in continental Greece. We show that the features o...
Anomalies in VLF radio signals prior the Abruzzo earthquake (M=6.3) on 6 April 2009
Anomalies VLF radio signals Abruzzo earthquake (M=6.3)
2009/12/8
The VLF/LF radio signals method for studying preseimic activity is applied to the Abruzzo earthquake (M=6.3, 6 April 2009). The data collected by three receivers located in Moscow (Russia), Graz (Aust...
Ionosperic anomaly due to seismic activities–Part 1:Calibration of the VLF signal of VTX 18.2 KHz station from Kolkata and deviation during seismic events
seismic activities Calibration VLF signal VTX 18.2 KHz station Kolkata seismic events
2009/12/8
VLF signals are long thought to give away important information about the lithosphere-ionosphere coupling. In order to establish co-relations, if any, between the ionospheric activities and the earthq...
Further study on the role of atmospheric gravity waves on the seismo-ionospheric perturbations as detected by subionospheric VLF/LF propagation
Further study atmospheric gravity waves seismo-ionospheric perturbations VLF/LF propagation
2009/12/8
As the target earthquake we have taken a huge earthquake (EQ) named Miyagi-oki earthquake on 16 August 2005 (with magnitude of 7.2) and we have analyzed the 4 month period including the date of this E...
Lightning characteristics observed by a VLF/LF lightning detection network (LINET) in Brazil, Australia, Africa and Germany
Lightning characteristics lightning detection network LINET Brazil Australia Africa Germany
2009/11/9
This paper describes lightning characteristics as obtained in four sets of lightning measurements during recent field campaigns in different parts of the world from mid-latitudes to the tropics by the...
中国周边有多个应用于导航的VLF发射站,当DEMETER卫星飞经中国大陆上空时, 它可以接收到来自这些发射站的信号. 利用DEMETER卫星接收到的来自5个不同发射站发出的VLF信号数据, 对发生在四川汶川8.0级地震进行研究, 发现震中上空区域不同频率信号对应的信噪比在地震前后都发生明显的变化: 震前明显降低, 震后有所恢复. 这个现象可能与地震和电离层耦合有关.
Multipoint Observations of Low Latitude VLF Pc3 Waves in South-East Australia
Pc3 magnetic pulsations Pc3 occurrence solar wind velocity magnetospheric physics
2009/5/6
Geomagnetic pulsations recorded on the ground are the signatures
of the integrated signals from the magnetosphere. Pc3 geomagnetic
pulsations are quasi-sinusoidal variations in the earth’s magnetic ...
Similar behaviors of natural ELF/VLF ionospheric emissions and transmitter signals over seismic Adriatic regions
Similar behaviors natural ELF/VLF ionospheric emissions transmitter signals seismic Adriatic regions
2010/1/4
We report on the analysis of ELF/VLF emissions observed by the Instrument Champ Electrique (ICE) experiment onboard the DEMETER micro-satellite. We consider principally selected seismic events reporte...
Statistical correlation of spectral broadening in VLF transmitter signal and low-frequency ionospheric turbulence from observation on DEMETER satellite
Statistical correlation spectral broadening VLF transmitter signal DEMETER satellite
2009/12/31
In our earlier papers we have found the effect of VLF transmitter signal depression over epicenters of the large earthquakes from observation on the French DEMETER satellite that can be considered as ...
Disturbances in a VLF radio signal prior the M=4.7 offshore Anzio (central Italy) earthquake on 22 August 2005
a VLF radio signal the M=4.7 offshore Anzio (central Italy) earthquake 22 August 2005
2009/12/30
On 22 August 2005 an earthquake with magnitude M=4.7 occurred in the Anzio (central Italy) offshore area. From 2002, a VLF-LF radio receiver is into operation in Bari (southern Italy). The intensity a...
Disturbances in a VLF radio signal prior the M=4.7 offshore Anzio (central Italy) earthquake on 22 August 2005
Disturbances VLF radio signal M=4.7 offshore Anzio earthquake
2010/1/4
On 22 August 2005 an earthquake with magnitude M=4.7 occurred in the Anzio (central Italy) offshore area. From 2002, a VLF-LF radio receiver is into operation in Bari (southern Italy). The intensity a...
简述了一种高分辨、大容量闪电VLF/VHF信号记录系统,报道了一次包含12次对地回击、平均回击间隔70ms、持续时间超过800 ms的地闪放电过程的VLF/VHF辐射波形全景以及分析结果.这一个典型事例揭示了一些有趣的现象:(1)这次过程的头5 ms出现了强烈的VLF双极性大脉冲序列,标志着云内初始击穿过程启动;对应于一系列VLF辐射事件出现了强烈的VHF辐射爆发,总体上看,前380 ms期间VH...
On the statistical correlation between the ionospheric perturbations as detected by subionospheric VLF/LF propagation anomalies and earthquakes
the statistical correlation the ionospheric perturbations subionospheric VLF/LF propagation anomalies and earthquakes
2009/12/30
Relatively long-period (4 years) data on different propagation paths by means of Japanese-Pacific VLF/LF network observation, are used to obtain further statistical significance on the correlation of ...
On the ionospheric perturbation associated with the 2007 Niigata Chuetsu-oki earthquake, as seen from subionospheric VLF/LF network observations
the ionospheric perturbation the 2007 Niigata Chuetsu-oki earthquake subionospheric VLF/LF network observations
2009/12/30
In order to investigate any precursory effect of ionospheric perturbations associated with the large 2007 Niigata Chuetsu-oki earthquake (16 July 2007) (magnitude, 6.8), we have made full use of our V...
On the generation mechanism of terminator times in subionospheric VLF/LF propagation and its possible application to seismogenic effects
the generation mechanism terminator times subionospheric VLF/LF propagation seismogenic effects
2009/12/29
The signals from VLF/LF transmitters are known to propagate in the Earth-ionosphere waveguide, so that the subionospheric propagation characteristics are very sensitive to the condition of the lower i...