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The variation of the estimated GPS instrumental bias and its possible connection with ionospheric variability

Science China(Technological Sciences) 2014年第1期57卷 67-79页

作者： ZHANG DongHe SHI Hao JIN YaQi ZHANG Wei HAO YongQiang XIAO Zuo Department of Geophysics Peking University Department of Geodesy and Geomatics Engineering University of New Brunswick Fredericton 4400 New Brunswick Canada

Based on the analysis of the satellite DCB data estimated by our method and the Center for Orbit Determination in Europe(CODE)from 1999 to 2011,the features of the temporal variation of differential code biases(DCB)are ***,there are three types of variations in DCB on different time *** first one is the day-to-day variation that exhibits more obviously in solar maximum *** second one is the variation with about one year periodic variation that behaves more obviously from 1999 to *** last one is the monotonously descending tendency from 1999 to *** the basic ionospheric approximation in DCB estimation method,the features of the variability of the ionospheric morphology from 1999to 2010 are also displayed based on the ionospheric characteristic *** can be concluded that the day-to-day and annual variation of the estimated global positioning system(GPS).DCB is related to the ionospheric *** variation of DCBs on solar cycle time scale includes the real hardware DCBs and pseudo-DCBs induced by ionospheric *** doubt,these kinds of"pseudo"variations of DCB will affect the precision of ionospheric total electron content(TEC)derived from the GPS *** addition,this study is helpful for evaluating the influence of ionospheric weather on TEC derivation and is also useful for developing one estimation method of DCB with more stability and precision through introducing a more practical ionospheric model.

关键词： DCB ionospheric variability GPS instrumental bias solar cycle

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Hour-to-hour variability of the ionosphere: An application of the classical multidimensional scaling method

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Science China Earth Sciences 2015年第7期58卷 1243-1250页

作者： SHI Hao ZHANG DongHe HAO YongQiang XIAO Zuo Department of Geophysics Peking University

The classical multidimensional scaling(MDS) method is introduced and applied in the study of the hour-to-hour ionospheric variability based on the ionospheric fo F2 observed at three ionosonde stations in East-Asia in 2002 and 2007. Results from the matrix eigen decompositions indicate that the annual part of the ionospheric variation is large in middle latitude and solar maximum period(2002) while low in the low latitude and solar minimum period(2007). The connectivity maps of the hour-to-hour ionospheric variability based on MDS method show some common diurnal features. The ionospheric connectivity between adjacent hours near noon hours and near midnight hours is high. The ionospheric connectivity between adjacent hours near sunrise hours and near sunset hours is poor, especially for the sunrise hours. Also there are latitudinal and solar activity dependences in this kind of connectivity. These results revealed from the ionospheric connectivity maps are useful physically and in practice for the ionospheric forecasting on the hour-to-hour scale.

关键词： ionospheric variability classical multidimensional scaling connectivity map

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variability of the behavior of the bottomside(B0,B1)parameters obtained from the ground-based ionograms at China's low latitude station

Variability of the behavior of the bottomside(B0,B1)paramete...

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中国科学院地质与地球物理研究所2008学术年会

作者： M.-L.Zhang ~(a,*),W.Wan ~a,L.Liu ~a,J.K.Shi~b a Institute of Geology and Geophysics,Chinese Academy of Sciences,P.O.Box 9825,100029 Beijing,PR China b Key Laboratory for Space Weather,Center for Space Science and Applied Research,Chinese Academy of Sciences, P.O.Box 8701,100080 Beijing,PR China

In this paper,data of(B0,B1) parameters deduced from the electron density profiles that are inverted from the ionograms recorded at Hainan(19.4°N,109.0°E),China during a three year period from March 2002 to February 2005 are used to study the diurnal and seasonal variation of(B0,B1) parameters at low *** observational results are compared with the IRI2001 model *** study of(B0,B1) in terms of percentage ratio of the inter-quartiles to the median values and correlative analysis between(B0,B1) parameters and other ionospheric characteristics such as hmF2 and M(3000)F2 are also *** present study showed that:(1)for daytime hours,the IRI2001 model results with new table option(B0ab) is in a better agreement with the observational results (B0bs) than the IRI2001 model results with Gulyaeva option(B0ul) for summer season,whereas B0ul is in a better agreement with B0bs than B0ab for winter *** nighttime,in general,B0ul is in a better agreement with B0bs than *** other occasions,both B0ab and B0ul showed some systematic deviations from the observational ***,the deviations of B0ab and B0ul from B0bs showed opposite trends;(2)the monthly upper(lower) quartiles of(B0,B1) parameter showed a good linear relationship with the monthly median values,this makes it possible to do the regression analysis between the monthly upper (lower) quartiles and the monthly median values,which can give a measure of the variability of these *** terms of the percentage ratio of the inter-quartiles to the median values,the variability of B0 showed a diurnal variation ranging between 22%and 36% with maximum value occurring at pre-sunrise hours,whereas the variability of B1 showed a diurnal variation ranging between 15%and 30%with higher value by daytime than at night;(3)B0 shows high linear correlative relationships with hmF2 and M(3000)F2 for most of the local time period of a day except for a few hours around midnight,whereas Bl show

关键词： Low latitude ionosphere ionospheric variability IRI model ionospheric modeling

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