Power transmission from the solar wind-magnetosphere dynamo to the magnetosphere and to the ionosphere: Analysis of the IMS Alaska meridian chain data     

S.-I. Akasofu  Y. Kamide  J.R. Kan  L.C. Lee  B.-H. Ahn 《Planetary and Space Science》1981,29(7):721-730

It is shown that the power ε generated by the solar wind-magnetosphere dynamo is transmitted to the convective motion of magnetospheric plasma. This convective motion generates what we may call the “Pedersen counterpart currents” in the magnetosphere and drives a large part of the “region 1 and 2” field-aligned currents which are closed by the Pedersen currents in the ionosphere. These results are based on a self-consistent set of the ionospheric current and potential distribution patterns obtained from a study of the International Magnetosphere Study Alaska meridian chain data.  相似文献   

论《孔疏》之“兴”     

安性栽 《广东海洋大学学报》2005,25(2):103-107

通过对《孔疏》标“兴”之特点与《毛诗传》《郑笺》标“兴”之特点比较分析,提出《孔疏》之标“兴”主要着眼于“兴”与作品主旨之间的关系,而没有特别注重标“兴”的位置。这些特点使得《孔疏》之“兴”开始从政治化逐渐转向文学化。  相似文献   

Fast Imaging Solar Spectrograph of the 1.6 Meter New Solar Telescope at Big Bear Solar Observatory     

Jongchul Chae  Hyung-Min Park  Kwangsu Ahn  Heesu Yang  Young-Deuk Park  Jakyoung Nah  Bi Ho Jang  Kyung-Suk Cho  Wenda Cao  Philip R. Goode 《Solar physics》2013,288(1):1-22

For high resolution spectral observations of the Sun – particularly its chromosphere, we have developed a dual-band echelle spectrograph named Fast Imaging Solar Spectrograph (FISS), and installed it in a vertical optical table in the Coudé Lab of the 1.6 meter New Solar Telescope at Big Bear Solar Observatory. This instrument can cover any part of the visible and near-infrared spectrum, but it usually records the Hα band and the Ca ii 8542 Å band simultaneously using two CCD cameras, producing data well suited for the study of the structure and dynamics of the chromosphere and filaments/prominences. The instrument does imaging of high quality using a fast scan of the slit across the field of view with the aid of adaptive optics. We describe its design, specifics, and performance as well as data processing  相似文献   

Temperature of Solar Prominences Obtained with the Fast Imaging Solar Spectrograph on the 1.6 m New Solar Telescope at the Big Bear Solar Observatory     

Hyungmin Park  Jongchul Chae  Donguk Song  Ram Ajor Maurya  Heesu Yang  Young-Deuk Park  Bi-Ho Jang  Jakyoung Nah  Kyung-Suk Cho  Yeon-Han Kim  Kwangsu Ahn  Wenda Cao  Philip R. Goode 《Solar physics》2013,288(1):105-116

We observed solar prominences with the Fast Imaging Solar Spectrograph (FISS) at the Big Bear Solar Observatory on 30 June 2010 and 15 August 2011. To determine the temperature of the prominence material, we applied a nonlinear least-squares fitting of the radiative transfer model. From the Doppler broadening of the Hα and Ca ii lines, we determined the temperature and nonthermal velocity separately. The ranges of temperature and nonthermal velocity were 4000?–?20?000 K and 4?–?11 km?s^?1. We also found that the temperature varied much from point to point within one prominence.  相似文献   

Mixture Gumbel models for extreme series including infrequent phenomena     

Thomas Rodding Kjeldsen  Hyunjun Ahn  Ilaria Prosdocimi  Jun-Haeng Heo 《水文科学杂志》2013,58(13-14):1927-1940

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Mortality and Physiological Responses with Regard to the Surf Clam,Mactra quadrangularis,Exposed to Chlorine     

Lee  Seon-Sik  Ahn  Hyung-Jin  Hwang  In-Uk  Kim  Eun  Han  Kyung-Nam 《Ocean Science Journal》2021,56(4):406-412

Ocean Science Journal - Carcinogenic disinfection by-products (DBPs) are formed as the result of the chlorination of power plant water cooling systems for biofouling purposes. Effects of cooling...  相似文献   

Influence of climate variation on seasonal precipitation in the Colorado River Basin   总被引：1，自引：1，他引：0  

Tae-Woong Kim  Chulsang Yoo  Jae-Hyun Ahn 《Stochastic Environmental Research and Risk Assessment (SERRA)》2008,22(3):411-420

This study analyzed the influence of large-scale climate pattern on precipitation in the Colorado River Basin. Large-scale climatic oscillations, like ENSO, PDO, NAO, and the global warming trend are associated with regional hydrologic variation. Ten types of climate indices were gathered and analyzed to investigate their influence on seasonal precipitation variation in the basin based on a linear correlation analysis and an influence index analysis. The influence index was developed in this study to measure the effect of climate variation on the seasonal precipitation in the basin. The statistical evidence achieved in this study confirms that the Colorado River Basin is subjected to the phase of climate variation. The strength of the seasonal response of precipitation to the climate variation varies in different localities in the basin. The methods of analysis used in this study were proposed in the hope that progress in understanding and modeling dynamic climatic systems can result in developing a valuable long-term forecasting model for water resources management.  相似文献   

Electric conductivities,electric fields and auroral particle energy injection rate in the auroral ionosphere and their empirical relations to the horizontal magnetic disturbances     

B.-H. Ahn  R.M. Robinson  Y. Kamide  S.-I. Akasofu 《Planetary and Space Science》1983,31(6):641-653

Recent progress in modeling ionospheric current systems requires global conductivity models which can reflect substorm conditions on an instantaneous basis. For this purpose, empirical relations of the North-South component (ΔH) of the magnetic disturbance field observed at College with the Pedersen (Σ_p) and Hall (Σ_H) conductivities deduced from the Chatanika radar data and their ratio ($\text{Σ}{}_{\mathrm{H}}\text{Σ}{}_{\mathrm{p}}$) are examined. These empirical formulas allow us to construct approximate distribution patterns of Σ_p and Σ_>H over the entire polar region on the basis of the distribution of ΔH at given instants by devising an appropriate weighting function for both the polar cap and the subauroral region. The global conductivity distributions thus obtained are compared with those employed by Kamide et al. (1981) and Spiro et al. (1982). The comparisons show that the gross features are similar among them. In addition, we also examine the relationship of ΔH with the North-South component of the electric field with the particle energy injection rate (u_A) estimated from the Chatanika radar data. Based on the empirical relation between Σ_H and u_A the global distribution of the latter over the entire polar region at particular instants can also be obtained.  相似文献   

Analysis of a jet-controlled high-lift hydrofoil with a flap     

S. H. Rhee  S. -E. Kim  H. Ahn  J. Oh  H. Kim 《Ocean Engineering》2003,30(16):2117-2136

A jet-controlled high-lift hydrofoil with a flap is investigated using both experimental and computational methods. Experiments were carried out in a cavitation tunnel to measure forces and moment acting on the hydrofoil, and surface pressure distribution. The measured data show the feasibility of such a device for marine applications. Computational studies have also been carried out in parallel with the measurements. The computational results are analyzed in terms of global and local quantities using available experimental data. The present computational results compare well with the well-known experimental data for circulation control flows. The results for flow around a hydrofoil with a blown flap further validate the concept behind the proposed device. The results of the study demonstrate the applicability of the technology to the design of practical control surfaces.  相似文献   

Parametrization of the Tidal Effect for Use in the Noah Land-Surface Model: Development and Validation     

Young-Hee Lee  Kwang-Deuk Ahn  Yong Hee Lee 《Boundary-Layer Meteorology》2016,161(3):561-574

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