| 太阳活动低年电离层磁场VLF波的观测特性研究 |
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| 引用本文： | 路立,杨俊英,曹晋滨,张学民,陈化然.太阳活动低年电离层磁场VLF波的观测特性研究[J].地球物理学报,2011,54(6):1403-1420. |
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| 作者姓名： | 路立 杨俊英 曹晋滨 张学民 陈化然 |
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| 作者单位： | 1. 中国科学院空间科学与应用研究中心空间天气学国家重点实验室,北京 100190;
2. 北京航空航天大学宇航学院,北京 100191;
3. 中国地震局地震预测研究所,北京 100036;
4. 中国地震局地球物理研究所,北京 100081 |
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| 基金项目： | 国家科技支撑计划项目，地震行业科研专项，空间天气学国家重点实验室方向性课题资助 |
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| 摘 要： | 本文利用搭载在DEMETER卫星上的感应式磁力仪(Instrument Magnetometer Search-Coil,IMSC)探测数据分析了磁场甚低频(Very Low Frequency,VLF)波功率谱的空间分布.在排除地磁扰动影响(Dst≤-30 nT,Kp≥3,AE≥200 nT)的前提下,我们给出200...
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| 关 键 词： | 磁场VLF波 功率谱密度 电离层地震响应 地磁异常 地磁活动 |
| 收稿时间： | 2010-04-26 |
Observational characteristics of ionospheric magnetic VLF wave in the solar minimum year |
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| LU Li,YANG Jun-Ying,CAO Jin-Bin,ZHANG Xue-Min,CHEN Hua-Ran.Observational characteristics of ionospheric magnetic VLF wave in the solar minimum year[J].Chinese Journal of Geophysics,2011,54(6):1403-1420. |
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| Authors: | LU Li YANG Jun-Ying CAO Jin-Bin ZHANG Xue-Min CHEN Hua-Ran |
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| Institution: | 1. State Key Laboratory of Space Weather,Centre for Space Science and Applied Research of the Chinese Academy of Sciences, Beijing 100190, China;
2. School of Astronautics, Beijing University of Aeronautics and Astronautics, Beijing 100191, China;
3. Institute of Earthquake Science, China Earthquake Administration, Beijing 100036, China;
4. Institute of Geophysics, China Earthquake Administration, Beijing 100081, China |
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| Abstract: | Ionospheric VLF wave recorded by the Instrument Magnetometer Search-Coil (IMSC) onboard the DEMETER spacecraft during 2007, the solar minimum year, were investigated statistically. By excluding the influence of geomagnetic activity with geomagnetic active indexes Dst ≤ -30 nT,Kp≥3 and AE≥200 nT, the quiet global distributions of power intensity spectrum of VLF wave, and the corresponding statistical error, were displayed for different seasons in both the dayside and the nightside. By using the power spectral global distribution background, the spectrum characteristics, seasonal variations and geomagnetic active responses of the VLF wave were analyzed statistically. The magnetic VLF wave observation in the solar synchronous orbit can also be sensitive to the magnetic anomalies produced from the Earth. At the frequency channel of 15 kHz and 17.5 kHz, the south Atlantic magnetic anomaly contour was presented clearly with the power spectral enhancement under the global background. The Bermuda geomagnetic anomalies caused VLF wave power spectral increase in almost all spectral bands at the nighttime, and showed about similar geomagnetic active responses as observed at higher latitude. Especially in the frequency band 12.5~17.5 kHz, we found that the power spectral increase along the edge of geographical plates, which will enhance our search for ionospheric seismo-response caused by the plate motion, and accumulate experiential background references for such anomalous signal identification quantitatively. |
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| Keywords: | Magnetic VLF wave Power intensity spectrum Ionospheric seismo-response Geomagnetic anomaly Geomagnetic active |
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