经常发生的地磁暴可引起电离层异常,并导致穿过电离层的GNSS导航信号产生异常延迟甚至难以被观测处理。因此,有必要对地球磁暴引起的电离层异常响应特征开展系统深入研究。在已有的全球电离层异常研究基础上,充分发挥了省级连续运行参考...经常发生的地磁暴可引起电离层异常,并导致穿过电离层的GNSS导航信号产生异常延迟甚至难以被观测处理。因此,有必要对地球磁暴引起的电离层异常响应特征开展系统深入研究。在已有的全球电离层异常研究基础上,充分发挥了省级连续运行参考站(Continuous Operation Reference Station,CORS)网测站密度大、数据细节丰富的优势,建立了区域电离层模型,精细化提取了电离层异常值。初步分析了磁暴期间电离层异常响应的时序关系、量级大小、空间分布和变化规律等:(1)磁暴与区域电离层异常之间的时间响应特征显示,地球磁暴可引起电离层异常,电离层异常在响应时间方面具有拖尾效应,磁暴结束24 h后电离层才恢复至磁暴前正常水平。(2)磁暴引起电离层垂直电子总含量(Vertical Total Electron Content,VTEC)异常变化的量级特征显示,小磁暴引起电离层天顶方向电子总量增大约9.5 TECU,对应视线方向电子总量增大约36 TECU。(3)磁暴引起电离层异常的空间分布特征显示,高纬度地区的电离层异常响应大于低纬度地区。(4)电离层异常响应的空间变化特征显示,磁暴期间电离层异常响应首先呈现出从南向北增大延伸态势;当电离层VTEC及其异常值达到峰值后,电离层异常响应呈现从北向南减弱回归态势。展开更多
Magnetic survey is one of the most successful techniques for locating buried unexploded ordnances( UXO). For the location and identification of buried UXO in Jinshan area,a total-field magnetic survey is applied. The ...Magnetic survey is one of the most successful techniques for locating buried unexploded ordnances( UXO). For the location and identification of buried UXO in Jinshan area,a total-field magnetic survey is applied. The analytic signal of magnetic field is widely used to outline the boundaries of geology bodies,slightly dependent on the magnetization direction. In order to locate the UXO position,the analytic signal is applied to process the magnetic UXO data,which performs better than the conventional magnetic data. Then a typical UXO anomaly is extracted from the original data to invert for its depth by an improved Euler method proposed.The calculated depth is close to the real buried depth.展开更多
文摘经常发生的地磁暴可引起电离层异常,并导致穿过电离层的GNSS导航信号产生异常延迟甚至难以被观测处理。因此,有必要对地球磁暴引起的电离层异常响应特征开展系统深入研究。在已有的全球电离层异常研究基础上,充分发挥了省级连续运行参考站(Continuous Operation Reference Station,CORS)网测站密度大、数据细节丰富的优势,建立了区域电离层模型,精细化提取了电离层异常值。初步分析了磁暴期间电离层异常响应的时序关系、量级大小、空间分布和变化规律等:(1)磁暴与区域电离层异常之间的时间响应特征显示,地球磁暴可引起电离层异常,电离层异常在响应时间方面具有拖尾效应,磁暴结束24 h后电离层才恢复至磁暴前正常水平。(2)磁暴引起电离层垂直电子总含量(Vertical Total Electron Content,VTEC)异常变化的量级特征显示,小磁暴引起电离层天顶方向电子总量增大约9.5 TECU,对应视线方向电子总量增大约36 TECU。(3)磁暴引起电离层异常的空间分布特征显示,高纬度地区的电离层异常响应大于低纬度地区。(4)电离层异常响应的空间变化特征显示,磁暴期间电离层异常响应首先呈现出从南向北增大延伸态势;当电离层VTEC及其异常值达到峰值后,电离层异常响应呈现从北向南减弱回归态势。
文摘Magnetic survey is one of the most successful techniques for locating buried unexploded ordnances( UXO). For the location and identification of buried UXO in Jinshan area,a total-field magnetic survey is applied. The analytic signal of magnetic field is widely used to outline the boundaries of geology bodies,slightly dependent on the magnetization direction. In order to locate the UXO position,the analytic signal is applied to process the magnetic UXO data,which performs better than the conventional magnetic data. Then a typical UXO anomaly is extracted from the original data to invert for its depth by an improved Euler method proposed.The calculated depth is close to the real buried depth.
