利用含純增長模式線的異常非相干散射譜反演擾動電子溫度
doi: 10.11999/JEIT170823
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1.
(西安電子科技大學物理與光電工程學院 西安 710071) ②(中國電波傳播研究所電波環(huán)境特性及模化技術(shù)重點實驗室 青島 266107)
基金項目:
國家自然科學基金(61475123, 61571355)，陜西省自然科學基礎(chǔ)研究計劃(2016JQ4015)
Inversion of Disturbed Electron Temperature by Anomalous Incoherent Scatter Spectra with Pure-growth Mode Line
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1.
(School of Physics and Optoelectronic Engineering, Xidian University, Xi&rsquo
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2.
(National Key Laboratory of Electromagnetic Environment, China Research Institute of Radio Wave Propagation, Qingdao 266107, China)
Funds:
The National Natural Science Foundation of China (61475123, 61571355), The Program for Natural Science Basic Research of Shaanxi Province (2016JQ4015)
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摘要: 基于平衡態(tài)非相干散射理論的GUISDAP程序包在擬合含有純增長模式線的非相干散射功率譜及反演加熱擾動電離層參量中存在嚴重誤差，該文提出一種以未加熱時刻的電離層參量為先驗信息，利用最小二乘法搜尋最佳高斯峰描述純增長模式線來修正實測非相干散射譜，并使用電子超高斯分布的非相干散射理論擬合修正后非相干散射譜來反演獲取加熱擾動電子溫度的方法。通過將該方法用于分析2010年秋季我國在挪威開展的電離層加熱實驗數(shù)據(jù)表明：利用該方法對含純增長模式線的實測譜修正擬合后獲得的電子溫度比未加熱時刻提高約800 K左右，增幅比例約13%~50%，該結(jié)果與現(xiàn)有文獻報道的電離層加熱引起的電子溫度增幅范圍吻合較好。結(jié)論表明該方法適用于基于含純增長模式線的非相干散射譜反演擾動電離層參量。Abstract: In the fitting process of the incoherent scatter power spectra with pure-growth mode line and the inversion of the disturbed ionospheric parameters, the GUISDAP package which is based on the equilibrium incoherent scatter theory, always exits serious error. Assuming the ionospheric parameters at heating-off time as a priori information, by using the least squares method to search the best Gaussian peak for the modification of the measured incoherent scatter spectra, one method is provided to obtain the disturbed electron temperature through fitting the modified measured spectra by taking advantage of the incoherent scatter theory of electron super-Gaussian distribution. This method is used to the ionospheric heating experimental data which is conducted in Norway in the autumn of 2010, and the results indicate that the electron temperature obtained by fitting the modified spectra is about 800 K higher than that of the heating off time, and the increase ratio is about 13%~50%, which is well coincided with the electron temperature increase range of ionospheric heating reported in the existing literature. The conclusion shows that the method is applicable to the inversion of disturbed ionospheric parameters by using of the incoherent scatter spectra with pure-growth mode line.
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