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Masley A.J. Sayterblom P.R. Pfitzer K.A. 《IEEE transactions on aerospace and electronic systems》1975,(6):1118-1124
The Solar Cosmic Ray and Trapped Particle Experiment was designed to study the entry, propagation, and loss of solar cosmic rays and the acceleration and loss of trapped electrons and protons in the magnetosphere. Two orthogonal proton and alpha partical telescopes measure protons from 300 keV to 250 MeV and alphas from 2 MeV to 200 MeV. Electron spectrometers measure electrons from 50 keV to 1 MeV and are used in conjunction with the 300-keV to 1.2-MeV proton channels to study the injection of electrons and protons into the magnetosphere during substorms. Two solar cosmic ray events were observed during the first four months of operation. The first of these began on July 3, 1974, and is probably one of the more complicated events in recent years. There were numerous flares and sudden commencements as well as intense fluxes of low energy plasma with a severly perturbed magnetosphere. The second solar cosmic ray event was smaller and was associated with an isolated east limb flare. The first increase was observed on September 11, 1974. 相似文献
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S.L. Huston G.A. Kuck K.A. Pfitzer 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》1998,21(12):1625-1634
Under NASA's Space Environment Effects (SEE) program, we are developing new models for the low-altitude (250–1000 km, L < 1.5) trapped radiation environment based on data from the TIROS/NOAA polar orbiting spacecraft. The unique features of this data base and model include the long time series (more than one complete solar cycle) obtained from the TIROS/NOAA data and the use of a coordinate system more applicable to the low-altitude environment. The data show a strong variation (as much as a factor of 10) over the solar cycle and a hysteresis effect between the rising and falling portions of the solar cycle. Both the solar cycle variation and the hysteresis are functions of L. In addition to the hysteresis effect, the flux during a given cycle appears to be a function of the previous cycle. Superimposed on the gradual variation over the solar cycle, transient effects, correlated with solar particle events (SPEs), can be clearly seen. Comparison with the AP8 models shows that the measured flux is a factor of 2–3 higher than the model. These data have important implications for the development and use of trapped radiation models, and will also contribute to our knowledge of the source and loss mechanisms at work in the inner zone. 相似文献
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基于我国飞机结构疲劳强度测试系统的实际情况,结合目前网络技术在工业领域中的应用,提出了一种基于以太网的远程控制型分布式应变测试系统,着重论述了采用以太网技术实现多个远程监控端和测试端之间的通信,通过实验验证了命令和数据传输的可靠性与实时性。 相似文献
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