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基于COSMIC掩星数据分析全球NmF2周年和半年变化特征
Using COSMIC occultation data analysis the global NmF2 annual and semiannual variations
- DOI:
- 作者:
- 马新欣1) 李大虎2) 焦立果1) 刘晓灿1)
Ma Xinxin1), Li Dahu2),Jiao Liguo1), Liu Xiaocan1)
- 作者单位:
- 1)中国北京 100081 中国地震局地球物理研究所2)中国成都 610041四川省地震局工程地震研究院
1) Institute Geophysics, China Earthquake Administration,Beijing,100081, China;2) Institute of Engineering Seismology of Earthquake Administration Sichuan Province,Chengdu, 610041,China;
- 关键词:
- COSMIC F2层峰值电子密度 周年变化 半年变化
COSMIC, NmF2, annual variation, semiannual variation
- 摘要:
- 利用COSMIC掩星提供的NmF2数据,使用傅里叶分析方法,研究全球F2层峰值电子密度的周年和半年分布特征,分析了2010年LT12:00-14:00 NmF2周年和半年变化幅度及2008-2011年年平均值的变化。结果显示,电离层NmF2周年和半年变化幅度在中高纬地区相对较大、赤道和低纬地区相对较小,在赤道和低纬地区,NmF2以半年变化为主。太阳活动增强期间,NmF2年平均值增大。
With the Fourier analysis method, the global NmF2 annual and semiannual variations are investigated by using COSMIC occultation data.We analyze annual and semiannual variations of NmF2 and its annual average value variations during the period of 2008-2011. Research shows that global NmF2 annual and semiannual variations are strong in the middle and high latitudes, and weak in the low latitudes and equatorial region. In the low latitudes and equatorial region, NmF2 is mainly dominated by semiannual variation. In the period of enhanced solar activity, NmF2 annual average value increases.