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Ionospheric behavior of the F2 peak parameters foF2 and hmF2 at Hainan and comparisons with IRI model predictions
Zhang, M. L.; Shi, J. K.; Wang, X.; Shang, S. P.; Wu, S. Z.; 北京8701信箱
Department空间天气学国家重点实验室
Source PublicationAdvances in Space Research
2007
Volume39Issue:5Pages:661-667
ISSN0273-1177
Language英语
KeywordLow Latitude Ionosphere F2 Peak Parameters Iri Model International Reference Ionosphere
AbstractMonthly 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 degrees N, 109.0 degrees E) are used to study the low latitude ionospheric variation behavior. The observational results are compared with the International Reference Ionospheric Model (IRI) predictions. The time period coverage of the data used for the present study is from March 2002 to February 2005. Our 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 156172 IRI predictions systematically underestimate the observed results during most time period of the day, with the percentage difference Delta foF2 (%) values changing between about -5% and -25%, whereas for a few hours around pre-sunrise, the IRI predictions generally overestimate the observational ones with Delta foF2 (%) sometimes reaching as large as similar to 30%. The agreement between the IRI results and the observational ones is better for the year 2002 than for the other years. The best agreement between the IRI results and the observational ones is obtained in summer when using URSI coefficients, with the seasonal average values of Delta foF2 (%) 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 results. However, 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 well. The 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 2002. During daytime hours the agreement between the hmF2 values obtained with CCIR M(30,000)F2 option and the observational ones is best for summer season. The discrepancy between the observational hmF2 and that obtained with CCIR M(30,000)F2 option stem from the CCIR M(3000)F2 model, which does not produce the small scale structures observed in the measured M(3000)F2.
Indexed BySCI
Funding Project中国科学院空间科学与应用研究中心
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/1086
Collection空间科学部
Corresponding Author北京8701信箱
Recommended Citation
GB/T 7714
Zhang, M. L.,Shi, J. K.,Wang, X.,et al. Ionospheric behavior of the F2 peak parameters foF2 and hmF2 at Hainan and comparisons with IRI model predictions[J]. Advances in Space Research,2007,39(5):661-667.
APA Zhang, M. L.,Shi, J. K.,Wang, X.,Shang, S. P.,Wu, S. Z.,&北京8701信箱.(2007).Ionospheric behavior of the F2 peak parameters foF2 and hmF2 at Hainan and comparisons with IRI model predictions.Advances in Space Research,39(5),661-667.
MLA Zhang, M. L.,et al."Ionospheric behavior of the F2 peak parameters foF2 and hmF2 at Hainan and comparisons with IRI model predictions".Advances in Space Research 39.5(2007):661-667.
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