New field of application of the IRI modeling – Determination of ionosphere transfer characteristic for radio astronomical signals

We suggest a new field of application of IRI modeling – determination of ionosphere transfer characteristic (ITC) for radio astronomical signals (RAS). VHF and HF RAS are widely used for observations of the Sun and pulsars. It is necessary to take into account possible distortions of RAS in the Earth ionosphere. However, in contrast to modern navigation systems (GPS, GLONASS, GALILEO), where very accurate reconstruction of ionosphere parameters is a built-in function, in present-day radio astronomy a retrieve of ITC has not been appropriately worked out yet. It collides with increasing requirements to accuracy of the analysis of RAS amplitude profile and to the angular and polarizing resolution of radio telescopes of new generation. We have developed a method and software for calculation of the ionosphere measure of rotation (RM) and the measure of dispersion (DM). We used the ionosphere model IRI-2001, magnetic-field model IGRF-10 and values of ionosphere total electron content as deduced from GPS measurements. The obtained values of the ionosphere DM and RM were recalculated into characteristics of phase delay, Faraday amplitude modulation and polarization changes. We made calculations for different levels of geomagnetic activity and for different angular position of radio sources as well.     

Anthropogenic trigger of substorms and energetic particles precipitations

The high-frequency (HF) emission in near-Earth space from various powerful transmitters (radio communications, radars, broadcasting, universal time and navigation stations, etc.) form an integral part of the modern world that it cannot do without. In particular, special-purpose research facilities equipped with powerful HF transmitters are used successfully for plasma experiments and local modification of the ionosphere. In this work, we are using the results of a complex space-ground experiment to show that exposure of the subauroral region to HF emission can not only cause local changes in the ionosphere, but can also trigger processes in the magnetosphere–ionosphere system that result in intensive substorm activity (precipitations of high-energy particles, aurorae, significant variations in the ionospheric parameters and, as a consequence, in radio propagation conditions).     

Comparison of global morphologies of vertical ion convergence and sporadic E occurrence rate

This study employs the Horizontal Wind model 2014 to calculate the intensity of the Vertical ion convergence (VIC) to examine the role of neutral wind shear in the global distribution of the Es occurrence rate. The global S4 observations from the FORMOSAT-3/COSMIC GPS Occultation Experiment (GOX) are used to derive global information on the Es occurrence. Both the simulation and observation suggest that the Es highly occurs in the mid-latitude regions of the summer hemisphere.     

第21,22周峰年太阳射电爆发中毫秒级精细结构的分析

本文对第21周的2840MHz及22周峰年的2545MHz，2645MHz和2840MHz波段上所观测到的285个快速事件进行分析，发现两个峰年的快速事件具有多种多样的快速活动（快速精细结构）．它们与耀斑的对应关系也做了统计分析．     

固体发动机可靠性设计面临的问题及其解决方法

针对可靠性设计没有数据导致可靠度无法计算的困难,提出放弃可靠度而使用事件流分析来控制产品可靠性的方法,该方法将产品主事件分解为一系列的事件,任何一个事件都可以分为应力(L)、应构(G)、应变(B)和传递(D)4个要素,每个要素都可以提出一些可测量的工作控制指标,只要能够确保每个工作控制指标符合设计意图,就能控制产品不出现故障。根据这种观点,提出了发动机可靠性设计的事件流分析技术,先按照事件发生顺序一步步地分析产品工作中会发生的各种事件,每个事件都用LGBD的结构展开,然后分析监测每个要素需要的测量参数,以及控制每个要素需要的设计参数,从而确定完备的工作控制指标体系,并确定可靠性试验方案。该方法放弃了可靠性模型,代之以事件流模型,为可靠性设计提供一种全新方法。     

某型机VHF电台通讯距离短问题的解决

提出了某型机VHF电台通讯距离短的问题,简述了对某型机VHF电台进行地面试验、空中作用距离试飞情况。并用通讯原理,对VHF电台通讯距离短进行了理论分析,采取了整改措施。最终解决了某型飞机VHF电台通讯距离短的问题,使飞行通讯联络正常。     

毫秒级资料处理的新方法：1991年5月16日2.84GHz太阳资料分析

本文对1991年5月16日事件的资料进行了数据处理,不仅证明毫秒级资料可以通过平均平滑还原为秒级,还表明经1990年修改后的2.84GHz接收机输出的不同时间常数资料内部是自洽的。同时对太阳毫秒级资料作带通滤波将不同时间尺度的快速起伏分离出来。虽然在1991年5月16日的太阳资料中仅能发现亚秒级的起伏,但这种新的资料处理办法对今后的太阳射电快速起伏资料研究与证认是有帮助的。     

空间微波系统中微放电现象

对微放电理论的研究历史进行了回顾。分析了微放电的发生条件和机理 ,讨论了影响微放电效应的各种因素 ,提出了各种增高微放电阈值电平的有效措施 ,以防止微放电效应发生 ,保护系统正常工作。给出了设计微放电部件的一般步骤 ,并对设计中需要注意的问题进行了论述     

1997年1月空间天气事件的三维MHD模拟

以1997年1月空气天气事件期间的观测为依据，在构造了比较接近真实的背景太阳风基础上，进一步利用三维时变的MHD模式，模拟了CME（日冕物质抛射）激发的扰动在行星际空间的传播过程，对地球空间环境的影响及行星际磁场南向分量Bz在1AU的时间经历。模拟结果与WIND卫星的测量进行了比较。结果表明，模拟与观测得到的扰动得到地球的时间、地球空间环境各量的变化及Bz的时间经历基本一致。     

舰空导弹发动机意外点火故障树分析

通过对舰空导弹发射准备时发动机意外点火事件的分析,建立了发动机意外点火故障树。定性分析获得了发动机意外点火模式和避免意外点火的有效模式,定量分析得到了发动机意外点火概率值,最后对分析结果进行了评价。