搜索结果: 1-12 共查到“理学 foF2”相关记录12条 . 查询时间(0.046 秒)
TEC and foF2 variations: preliminary results
ionospheric variability radio wave propagation space and satellite communications
2015/9/14
Investigation of the relationship between TEC and (foF2)2 shows that although they are highly correlated, a 玥ysteresis?effect exists between them. The slab thickness is greater before than after mid-d...
Association of Total Electron Content (TEC) and foF2 variations with earthquake events at the anomaly crest region
earthquake TEC foF2 anomaly
2015/9/14
The paper attempts to identify ionospheric parameters in association with earthquake at anomaly crest station through VHF Radio Beacon data and ground based ionosonde measurements while the Total Elec...
太阳辐射是电离层的电离源,强烈地调制电离层的变化.探索不同太阳辐射水平下的电离层状态,有助于认识电离层演变及其内在的基本物理过程.太阳活动在2008—2009年处于有记录以来的极低水平,研究电离层在此期间的变化及与其它太阳活动低年的差异是一个有益的课题.本文利用位于美洲扇区磁赤道地区Jicamarca台站(12.0°S, 283.2°E; dip 0.28°)测高仪观测的电离层F2层临界频率foF...
Day-time variations of foF2 connected to strong earthquakes
Day-time variations foF2 strong earthquakes
2009/12/16
The statistical analysis of the characteristic frequency foF2 of the Earth's ionosphere averaged over mid-day hours – from 11:00 till 17:00 h LT – is carried out. Disturbances of foF2 connected to ear...
Day-time variations of foF2 connected to strong earthquakes
Day-time variations foF2 strong earthquakes
2009/12/8
The statistical analysis of the characteristic frequency foF2 of the Earth's ionosphere averaged over mid-day hours – from 11:00 till 17:00 h LT – is carried out. Disturbances of foF2 connected to ear...
Neural-network-based prediction techniques for single station modeling and regional mapping of the foF2 and M(3000)F2 ionospheric characteristics
Neural-network-based prediction techniques single station modeling regional mapping ionospheric characteristics
2009/11/12
In this work, Neural-Network-based single-station hourly daily foF2 and M(3000)F2 modelling of 15 European ionospheric stations is investigated. The data used are neural networks and hourly daily valu...
foF2月中值太阳循环变化及单站谱模型研究
太阳循环变化 单站模型 foF2月中值 太阳黑子数
2009/5/4
利用我国9个电离层观测站第21和22太阳周大约20年的foF2月中值数据，分析太阳活动和地磁活动对电离层foF2的影响，结果显示白天和夏季夜间foF2和太阳黑子数R之间存在着明显非线性关系，并且随着纬度的降低逐渐增强．当回归分析加入地磁Ap指数时，多重回归模型与实测值误差进一步减小，说明同时考虑太阳活动和地磁活动的非线性影响能够更好地描述foF2的变化．基于foF2太阳黑子数R及地磁指数Ap之间的...
foF2 seismo-ionospheric effect analysis:actual data and numerical simulations
foF2 seismo-ionospheric effect analysis actual data numerical simulations
2010/1/4
On the background of seasonal and helio-geomagnetic disturbances, disturbances of the ionization density near noon connected to earthquakes are investigated. The study is performed for some tens of ea...
foF2月中值太阳循环变化及单站谱模型研究
太阳循环变化 单站模型 foF2月中值 太阳黑子数
2008/10/10
利用我国9个电离层观测站第21和22太阳周大约20年的foF2月中值数据，分析太阳活动和地磁活动对电离层foF2的影响，结果显示白天和夏季夜间foF2和太阳黑子数R之间存在着明显非线性关系，并且随着纬度的降低逐渐增强．当回归分析加入地磁Ap指数时，多重回归模型与实测值误差进一步减小，说明同时考虑太阳活动和地磁活动的非线性影响能够更好地描述foF2的变化．基于foF2太阳黑子数R及地磁指数Ap之间的...
中国地区电离层foF2重构方法及其在短期预报中的应用
电离层重构 电离层预报 克里格法 中国参考电离层
2008/5/20
提出了一种适合于中国地区电离层foF2的重构方法——以中国参考电离层为背景的改进克里格法.该方法把foF2的估计值与中国参考电离层模型值之差值的相对值作为区域化变量，引入电离层距离，采用克里格法实现区域电离层重构.与直接利用foF2进行克里格重构相比，以中国参考电离层为背景场保持了电离层的区域特征，提高了重构的准确性和稳定性.利用我国电离层垂测台站网的数据对该方法应用于中国地区的重构精度进行了评估...
On variations of foF2 and F-spread before strong earthquakes in Japan
variations foF2 F-spread strong earthquakes Japan
2009/12/29
The statistical analysis of the variations of the dayly-mean frequency of the maximum ionospheric electron density foF2 is performed in connection with the occurrence of (more than 60) earthquakes wit...