检索结果-南通市图书馆

Analysis of Weather Conditions for Aerial Security and Optimization in Maroua-Salak

Atmospheric and Climate Sciences 2022年第1期12卷 172-188页

作者： Daïka Augustin Igri Moudi Pascal Mounabbahou Mal Oumarou mbane biouele cesar Department of Meteorology and Climatology National Advanced School of Engineering University of Maroua Maroua Cameroon Laboratory of Earth’s Atmosphere Physics Faculty of Science University of Yaoundé 1 Yaoundé Cameroon Climate Application and Prediction Centre of Central Africa (CAPC-AC) Douala Cameroon Laboratory of Environmental Modeling and Atmospheric Physics Department of Physics Faculty of Science University of Yaoundé 1 Yaoundé Cameroon

In this study, the weather conditions of the accident at Maroua-Salak airport on 02 August 2020 are analyzed. This C130 aircraft accident took place under bad weather conditions. This bad weather is diagnosed using the models as CFS, GFS and GEFS that reanalyze outputs of the results. At the end of this re-analysis, the result obtained shows that the event which took place at the Maroua-Salak airport was predictable. However, the analysis of these results has made it possible to present the rainfall cumul between 05 and 10 mm for this day. In addition, a comparative study of the rainfall cumul obtained by the CFS, GFS and GEFS models and that estimated by the satellites has been carried out. These models can significantly improve the prevention of such disasters in the region.

关键词： Weather Conditions Maroua-Salak Airport Models Rainfall Cumul

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Day-to-Day Variability of H Component of Geomagnetic Field in Central African Sector Provided by Yaoundé-Cameroon Amber Station

引用

International Journal of Geosciences 2014年第10期5卷 1190-1205页

作者： Messanga Etoundi Honore Kosh Djaka Comelo mbane biouele cesar Laboratory of Earth’s Atmosphere Physics Department of Physics University of Yaoundé I Yaoundé Cameroun

The geomagnetic data obtained from Amber Network station in Cameroon have been used for this study. The variability of H component of geomagnetic field has been examined by using geomagnetic field data of X and Y components recorded at AMBER magnetometer station hosted by the Department of Physics of University of Yaoundé (3.87°N, 11.52°E). The day-to-day variability of the horizontal intensity of the geomagnetic field was examined and shows that the scattering of H component of magnetic field variation is more on disturbed than that on quiet condition. The signatures H of geomagnetic Sq and Sd variations in intensities in the geomagnetic element, has been studied. This study shows that the daytime variations in intensities of geomagnetic elements H, Sq(H) and Sd(H) respectively are generally greater than night-time ones. This paper interests answering the two questions: 1) how can geomagnetic variations be used to study the equatorial ionosphere electrodynamics and electrojet equatorial over Africa in general and Cameroon in particular? 2) How can geomagnetic variations be used to monitor and predict space weather events in Cameroon? This paper presents and interprets the results of H component of geomagnetic field variations during magnetic storms and on quiet days.

关键词： Geomagnetic Field AMBER Magnetometer Station Magnetic Storms Equatorial Electrojet

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Useful and Unique Descriptions of Tropospheric Processes Which Produce Oxygen and Thereafter Give Birth to Equatorial Electro-Jets

引用

International Journal of Geosciences 2015年第11期6卷 1248-1253页

作者： cesar mbane biouele Laboratory of Earth’s Atmosphere Physics Department of Physics University of Yaoundé I Yaoundé Cameroun

Formation of negative static charges (e-) throughout troposphere is a natural phenomenon revealed by some weather events such as storms and lightning flashes that accompany thunderclouds. This climatic phenomenon (formation of negative charge in that case) has long been considered as physical phenomena of very small space-time scales. Now we have good reasons to say that this perception of troposphere electrical status is totally meaningless. Indeed, it is now easy to show that significant numbers of electrons are provided to troposphere at each appearance of a thunderstorm (or a lightning flash). Thereafter, movement implemented in the troposphere by winds (e.g., West African aerojet) contributes to the formation of low altitudes Electrojets (e.g., West African Equatorial Aerojet gives birth to West African Equatorial Electrojet). The existence of Low Layers Equatorial Electrojets (LL-EEJ) was totally unknown by the first theorists who have studied the Earth’s Ionosphere Plasma Physics and Electrodynamics. This mistake has led their followers to many questions unanswered in their attempt to explain the longitudinal and seasonal variations of observed EEJ. In this paper, we will provide many useful explanations on the manner in which clouds provide oxygen to troposphere and thereafter trigger negative static charges (e-) throughout both troposphere and ionosphere. Indeed, this paper also explains how, opportunely, the ITF (inter tropical front) plays the role of the tap which facilitates oxygen transfer from troposphere to ionosphere. Detailed studies on the Earth’s troposphere plasma physics and electrodynamics are impatiently awaited.

关键词： Formation of Negative Static Charges (e-) throughout Troposphere Earth’s Troposphere Plasma Physics and Electrodynamics Oxygen Transfer from Troposphere to Ionosphere

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Application of Stationary Phase Method to Wind Stress and Breaking Impacts on Ocean Relatively High Waves

引用

Open Journal of Marine Science 2014年第1期4卷 18-24页

作者： Augustin Daika Theodule Nkoa Nkomom cesar mbane biouele Laboratory of Earth’s Atmosphere Physics Department of Physics Faculty of Science University of Yaoundé I Yaoundé Cameroon

Wind stress impacts on ocean relatively high waves can be perfectly illustrated by a recurrent phenomenon in the Sahara desert. Indeed, on this area where the surface wind can blow without encountering major obstacle out of the sand dunes, these main targets are gradually eroded and displaced by the wind on dozens of meters. This experience highlights the action of wind on granular targets (clusters of sand or water slides) and motivates studies similar to ours, where we want to simulate impact of wind stress and breaking on the spatio-temporal evolution of the envelope of ocean relatively high waves: Impact which can inappropriately deflect the waves on ships, oil platforms or coastal infrastructures. Euler and Navier-Stokes equations allow a mathematical formulation of the gravity wave motion (ocean waves are considered in our work as a system of water particles which are held together by low surface tension) and wind acts on targets through friction forces or stress. Michel Talon stationary phase method is used to numerically solve the equations that model the impact of wind on a stationary Gaussian.

关键词： Wind Stress Granular Targets Low Surface Tension Stationary Phase Method Stationary Gaussian

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：