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Long-term trends in foF2 over Moscow ionosonde station: Its estimate and origins
Fang HanXian; Weng LiBin; Yang ShengGao; Wang SiCheng; Weng, LB (reprint author), Peoples Liberat Army Univ Sci & Technol, Inst Meteorol, Nanjing 211101, Jiangsu, Peoples R China.
Department空间科学部
Source PublicationCHINESE SCIENCE BULLETIN
2012
Volume57Issue:12Pages:1443-1448
ISSN1001-6538
Language英语
KeywordIonosphere Long-term Trends Iri-2007 Moscow
AbstractWe introduce a new approach, using the International Reference Ionosphere 2007 (IRI-2007) model and observations from the Moscow ionosonde station, to analyze the long-term trends of ionospheric foF2. Possible origins, whether natural or manmade, are discussed. A small but significant residual foF2 trend is found, with -0.76 MHz over the past 50 years, but -0.2 MHz after eliminating the most variations caused by solar and geomagnetic activities and the variational earth's magnetic field. We find that this slope depends on local time and seasons. There is a pronounced diurnal negative variation in k (annual mean slope of diurnal variations), with much larger absolute values in the morning than during afternoon or evening; the largest k is about -0.0018 per year in spring, and the smallest trend of about -0.0012 per year occurs in winter. Finally, the evidence of crucial influences of geomagnetic activity and the earth's magnetic field on the observed trends, as emphasized by the IRI-2007 empirical model, is confirmed, and the effect of CO2 contributions to the trend is also discussed, by cooling the thermospheric temperature or recombining the electron density.; We introduce a new approach, using the International Reference Ionosphere 2007 (IRI-2007) model and observations from the Moscow ionosonde station, to analyze the long-term trends of ionospheric foF2. Possible origins, whether natural or manmade, are discussed. A small but significant residual foF2 trend is found, with -0.76 MHz over the past 50 years, but -0.2 MHz after eliminating the most variations caused by solar and geomagnetic activities and the variational earth's magnetic field. We find that this slope depends on local time and seasons. There is a pronounced diurnal negative variation in k (annual mean slope of diurnal variations), with much larger absolute values in the morning than during afternoon or evening; the largest k is about -0.0018 per year in spring, and the smallest trend of about -0.0012 per year occurs in winter. Finally, the evidence of crucial influences of geomagnetic activity and the earth's magnetic field on the observed trends, as emphasized by the IRI-2007 empirical model, is confirmed, and the effect of CO2 contributions to the trend is also discussed, by cooling the thermospheric temperature or recombining the electron density.
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/122/3301
Collection空间科学部
Corresponding AuthorWeng, LB (reprint author), Peoples Liberat Army Univ Sci & Technol, Inst Meteorol, Nanjing 211101, Jiangsu, Peoples R China.
Recommended Citation
GB/T 7714
Fang HanXian,Weng LiBin,Yang ShengGao,et al. Long-term trends in foF2 over Moscow ionosonde station: Its estimate and origins[J]. CHINESE SCIENCE BULLETIN,2012,57(12):1443-1448.
APA Fang HanXian,Weng LiBin,Yang ShengGao,Wang SiCheng,&Weng, LB .(2012).Long-term trends in foF2 over Moscow ionosonde station: Its estimate and origins.CHINESE SCIENCE BULLETIN,57(12),1443-1448.
MLA Fang HanXian,et al."Long-term trends in foF2 over Moscow ionosonde station: Its estimate and origins".CHINESE SCIENCE BULLETIN 57.12(2012):1443-1448.
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