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Ionospheric behavior of the f2 peak parameters fof2 and hmf2 at Hainan and comparisons with IRI model predictions

Ionospheric behavior of the F2 peak parameters foF2 and hmF2...

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中国科学院地质与地球物理研究所2007学术年会

作者：张满莲 Division of Geomagnetism and Space Physics Institute of Geology and GeophysicsChinese Academy of Sciences

Monthly median values of fof2,hmf2 and M(3000)f2 parameters,with hourly time interval resolution for the diurnal variation, obtained with DPS-4 digisonde observations at Hainan(19.4°N,109.0°E) are used to study the low latitude ionospheric variation behavior. The observational results are compared with the International Reference Ionospheric Model(IRI) *** time period coverage of the data used for the present study is from March 2002 to february *** present study showed that:(1) In general,IRI predictions using CCIR and URSI coefficients follow well the diurnal and seasonal variation patterns of the experimental values of fof2. However,CCIR fof2 and URSI fof2 IRI predictions systematically underestimate the observed results during most time period of the day,with the percentage differenceΔfof2(%) values changing between about -5%and -25%,whereas for a few hours around pre-sunrise, the IRI predictions generally overestimate the observational ones withΔfof2(%) sometimes reaching as large as～30%.The agreement between the IRI results and the observational ones is better for the year 2002 than for the other *** best agreement between the IRI results and the observational ones is obtained in summer when using URSI coefficients,with the seasonal average values ofΔfof2(%) being within the limits of±10%.(2) In general,the IRI predicted hmf2 values using CCIR M(3000)f2 option shows a poor agreement with the observational ***,when using the measured M(3000)f2 as input,the diurnal variation pattern of hmf2 given by IRI2001 has a much better agreement with the observational one with the detailed fine structures including the pre-sunrise and post-sunset peaks reproduced reasonably *** agreement between the IRI predicted hmf2 values using CCIR M(30,000)f2 option and the observational ones is worst for the afternoon to post-midnight hours for the high solar activity year *** daytime hours the agreement between the hmf2 values obtained

关键词： Low latitude ionosphere f2 peak parameters IRI model

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Evaluation of global modeling of M(3000)f2 and hmf2 based on alternative empirical orthogonal function expansions

Evaluation of global modeling of M(3000)F2 and hmF2 based on...

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中国科学院地质与地球物理研究所第十届(2010年度)学术年会

作者： Man-Lian Zhang,Chunxu Liu,Weixing Wan,Libo Liu,Baiqi Ning Beijing National Observatory of Space Environment,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China

Global modeling of M(3000)f2 and hmf2 based on three alternative EOf(empirical orthogonal function) expansion methods is described *** used for the model construction is the monthly median hourly values of M(3000)f2 from the ionosonde/digisonde stations distributed around the world for the period of 1975-1985 and the hmf2 data of the same period converted from the measured M(3000)f2 based on the strong anti-correlation existing between *** data of a low(1965) and a high(1970) solar activity year are used to validate the three alternative models based on different EOf expansion *** between the modeled results and observed data for both the low(1965) and high(1970) solar activity years showed good agreement for both M(3000)f2 and hmf2 *** analysis on the differences between model values and observed data showed that all the three alternative models(Model A,B and C) based on the different EOf expansion methods have better agreement with the observed data than the models currently used in *** three alternative EOf based models have almost the same *** on the preference of the three alternative EOf based models is given.

关键词： Ionospheric models M(3000)f2/hmf2 EOf analysis f2 peak parameters Global modeling

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