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Establishment of N m F 2 empirical model in the northern hemisphere based on COSMIC occultation data

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Abstract

Ionospheric peak value of F2 layer (N m F 2) is an important parameter in the ionosphere, which has important applications in short-wave communication, ionospheric modeling and so on. In this paper, the empirical orthogonal function (EOF) decomposition method is used to analyze the N m F 2 obtained from the occultation data. Daily spatial distribution of N m F 2 at the same time is relatively even. Variance of first modal is much larger than the other modals. A local wavelet power spectrum (LWPS) method is applied to analysis the cycle of F 10.7 index and time coefficient of first modal. The result shows that they have similar cycle distribution, indicating that F 10.7 index is the main factor affecting variation of N m F 2. A function is established between the tine coefficient of first modal and F 10.7 index, average F 10.7 index value of early 81 days f p by least squares method. The results show that contribution coefficient of f p is negative which indicates that f p has an inert effect existing in the ionosphere. Contribution coefficient of F 10.7 is positive, which is consistent with the fact that it has an anomaly in winter/spring seasons. In summary, it is feasible to establish a mid-latitude empirical N m F 2 model in northern hemisphere based on occultation data and EOF decomposition method.

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Authors and Affiliations

  1. Institution of Meteorology and Oceanography, PLA University of Science and Technology, Nanjing, 211101, China

    Jun Niu, HanXian Fang & LiBin Weng

  2. State Key Laboratory of Space Weather, Chinese Academy of Sciences, Beijing, 100190, China

    Jun Niu, HanXian Fang & LiBin Weng

Authors
  1. Jun Niu
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  2. HanXian Fang
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  3. LiBin Weng
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Correspondence to HanXian Fang.

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Niu, J., Fang, H. & Weng, L. Establishment of N m F 2 empirical model in the northern hemisphere based on COSMIC occultation data. Sci. China Technol. Sci. 57, 339–344 (2014). https://doi.org/10.1007/s11431-013-5447-3

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  • DOI: https://doi.org/10.1007/s11431-013-5447-3

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