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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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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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A comparative study of the bottomside profile parameters over Wuhan with IRI-2001 for 1999-2004

A comparative study of the bottomside profile parameters ove...

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中国科学院地质与地球物理研究所2006学术年会

作者： Huajiao Chen~(1,2,3),Libo Liu~1,Weixing Wan~1,and Baiqi Ning~1 1 Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China 2 Wuhan Institute of Physics and Mathematics,Chinese Academy of Sciences,Wuhan,China 3 Graduate School of Chinese Academy of Sciences,Beijing 100049,China

The diurnal,seasonal,and solar activity of the bottomside ionospheric profile parameters B0 and B1 are studied using electron density profiles measured over Wuhan(30.4°N, 114.4°E) of China with a DGS-256 Digisonde during *** are made with the International Reference ionosphere model(IRI-2001) using both the standard option(B0-Tab and B1-Tab) and the Gulyaeva’s option(B0-Gul and B1-Gul).The results show that:(1) observed B0 has distinct diurnal and seasonal variations,while observed B1 changes little with *** value of B0 is larger in summer than that in equinox and winter,especially for *** winter and equinox,B0 also presents morning and afternoon collapses as reported by Lei et al(2004).(2) B0 increases about 18.6 km from low solar activity(LSA) to high solar activity(HSA).B1 in HSA is smaller than that in LSA before 10:00 LT and with an opposite tendency during the rest time.(3) Observed B0 is in better agreement with B0-Gul than with B0-Tab,though the B0-Gul overestimates during 09:00 to 17:00 LT in equinox and ***-Tab is 12-20 km larger than the observations over Wuhan almost all the ***,B1-Tab is in good agreement with the observations.

关键词： low latitude ionosphere DGS-256 Digisonde IRI model Modeling and forecasting

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