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Ali G. Hafez Essam Ghamry 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2011
One of global processes in ionosphere–thermosphere–magnetosphere system is the geomagnetic storms. It is of great importance to develop an algorithm that auto-detects sudden commencement because it could be an indicator of onset of the geomagnetic storm. Automatic detection of geomagnetic sudden commencement is based on time–frequency clusters generated by spectrogram. Proposed algorithm is tested on data set collected from stations belong to the international real-time magnetic observatory network (INTERMAGNET). Maximum standard deviation of algorithm detection times is observed to be one minute of the corresponding arrival times published by National Geophysical Data Center (NGDC). 相似文献
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文章介绍了空间红外望远镜装置SIRTF(SpaceInfraredTelescopeFacility)的用途 ,详细介绍了SIRTF上携带的低温望远镜装置CTA(CryogenicTelescopeAssembly)和 3台成像仪器 :红外阵列相机IRAC(In fraredArrayCamera)、红外光谱仪IRS(InfraredSpectrogram)和多谱段成像分光计MIPS(MultibandImagingPho tometerforSIRTF)。 相似文献
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本文利用图象分析的方法,将ISEE卫星的等离子体能谱图数值化,以便定量地分析ISEE卫星观测到的磁尾等离子体和磁场资料。以及研究磁尾中性片的纤维结构,对今后研究近地磁尾(22个地球半径以内)各种空间动力学机制,电流结构体系等问题都有很重要的利用价值。 相似文献
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