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Report on Science Project for Probing the High-Latitude Ionosphere with Complementary Radar and Energetic Neutral Atom(ENA)Measurements

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International Journal of Geosciences 2014年第6期5卷 607-610页

作者： Daniel Martini Carl-Fredrik Enell Anita Aiko Thomas Ulich Young-Sil Kwak School of Space Research Kyung Hee UniversitySeoulKorea EISCAT Scientific Association KirunaSweden Space Physics Group University of OuluOuluFinland Sodankyla Geophysical Observatory University of OuluSodankylaFinland Korean Astronomy and Space Science Institute(KASI) DaejeonKorea

Vast magnetospheric regions are mapped along the field lines to the narrow latitudinal band of the polar/auroral regions. Therefore monitoring of solar wind energy dissipation into the ionosphere at auroral latitudes gives unique opportunities to study geomagnetic disturbances in their complexity from a relatively well-localized vantage point. Here we introduce and present the current state of a recently proposed science project for coordinated monitoring of high-latitude activity with the EISCAT (European Incoherent Scatter) radar array supported by ground-based magnetometer and optical data and ENA (Energetic Neutral Atom) observation from the CINEMA (Cube-Sat for Ions, Neutrals, Electrons and Magnetic field) satellite system.

关键词： Energetic Neutral Atoms Incoherent Scatter Radar satellite observation Ionsphere Geomagnetic Activity

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Aerosol – Cloud Interaction and Cloud Vertical Structure From passive to Active Sensing

Aerosol – Cloud Interaction and Cloud Vertical Structure Fr...

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第十八届中国科协年会——分12 大气雾霾及PM2.5控制先进技术研讨会

作者： Kazuaki KAWAMOTO Graduate School of Fisheries and Environmetal Sciences Nagasaki University

First, the principles of satellite remote sensing for aerosols and cloud properties are reviewed, and several observational results from passive and active sensors are shown, for example, implications with Twomey effect. Then following analyses are explained on the behavior of radar reflectivity(Ze) from Cloud Profiling Radar on board Cloud Sat with variation in the properties of low-level water clouds, such as the effective droplet radius(re), geometrical thickness(Dcld), and liquid water path(LWP), over the northwest Pacific and China. The changes in the distribution of max Ze(the largest Ze within a cloud layer) were examined in terms of variation in the cloud parameters such as small, mid and large categories, while max Ze had monomodal distributions regarding variation in re and Dcld, that appeared bimodal in the small category of LWP. It was confirmed that the small category of LWP contained both nonprecipitating clouds in the incipient stage and raining clouds in the dissipating stage. Next, optically measured particle size was combined with LWP derived from the microwave measurement to classify the precipitation type. Applying max Ze and Dcld to the analysis of classified precipitation types corroborated the importance of Dcld for examining the occurrence of precipitation. Finally, the position of max Ze relative to the cloud top was investigated using a measure of the probability of precipitation(POP) according to variation in re in order to get better understanding of the vertical distribution of precipitation amount. The results showed that the Pacific and China had ‘bow’ and ‘funnel’ shapes, respectively. The emergence of these shapes according to the variation in re was interpreted as the enhancement of Ze due to droplet collisional growth and the attenuation of Ze by the presence of large particles. Furthermore, a detailed analysis of smaller particles(nearly10 μm in radius) reinforced the idea of rapid, efficient particle growth in the lower part of t

关键词： aerosol indirect effect cloud properties satellite observation MODIS Cloud Sat

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TIME-IGGCAS model validation:Comparisons with empirical models and observations

TIME-IGGCAS model validation:Comparisons with empirical mode...

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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： YUE XinAn~(1,2,3),WAN WeiXing~(1+),LIU LiBo~1,NING BaiQi~1,ZHAO BiQiang~1 & ZHANG ManLian~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 430071,China 3 Graduate University,Chinese Academy of Sciences,Beijing 100049,China

The TIME-IGGCAS(Theoretical Ionospheric Model of the Earth in Institute of Geology and Geophysics,Chinese Academy of Sciences) has been developed recently on the basis of previous *** test its validity,we have made comparisons of model results with other typical empirical ionospheric models(IRI, NeQuick-ITUR,and Tltheridge temperature models) and multi-observations(GPS, lonosondes,Topex,DMSP,FORMOSAT,and CHAMP) in this *** conclusions are obtained from our *** modeled electron density and electron and ion temperatures are quantitatively in good agreement with those of empirical models and ***-IGGCAS can model the electron density variations versus several factors such as local time,latitude,and season very well and can reproduce most anomalistic features of ionosphere including equatorial anomaly,winter anomaly,and semiannual *** results imply a good base for the development of ionospheric data assimilation model in the future. TIME-IGGCAS underestimates electron temperature and overestimates ion temperature in comparison with either empirical models or *** model results have relatively large deviations near sunrise time and sunset time and at the low *** results give us a reference to improve the model and enhance its performance in the future.

关键词： ionosphere theoretical model empirical model satellite observation relative deviation

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