湘鄂渝黔边域定位：“中国绿心”游憩第一区——以大湘西北地区为例

湘鄂渝黔边界区域具有独特的地域文化资源与迷人的自然生态资源,且处在中国地理版图的心脏部位,故称之为“中国绿心”。整合该区域游憩文化资源,构建跨区域的游憩核心区,提升核心竞争力,有利于培育以奇特自然生态体验、社会传统民俗欣赏与诗意栖居生活享受等为主要内容的中国游憩第一区。其路径选择在于：制定新绿色战略,打造绿色品牌,保育绿色生态,发展绿色产业集群,营建绿色城镇,弘扬绿色文化,启动绿色机制。     

对预警机相控阵雷达主瓣干扰的可行性分析

相控阵雷达是当前广泛采用的一种战术雷达，它可以地面、舰船为平台，也可以飞机为平台。机载平台中，除了作多用途雷达外，也可用作预警机预警雷达（如美Ｅ－８Ａ中的ＡＰＹ－３）。由于它具有高的主瓣增益和超低副瓣电平、相关接收技术，加上有的相控阵雷达采用实时自适应数字波束形成技术，使用灵活的控制和排序软件可有效对付多部干扰机，给对主瓣干扰带来极大困难。对相控阵雷达干扰有多种方法，本文提出一种分布式干扰方法，即     

月面热环境的反演研究

以嫦娥三号巡视器月面日食期间非稳态的温度遥测数据为基础,通过建立月壤及巡视器的传热模型,反演了日食期间月面温度的变化,并给出了符合巡视器温度遥测的月壤热物性参数取值范围。在此基础上,对月面热环境进行了分析研究。结果表明,本文反演的月壤平均导热系数大于常见取值,而比热却明显小于常见取值。采用反演的热物性值计算的月表温度与之前认识相符,但对月壤内部热环境有新发现,其温度梯度相对减小而恒温层厚度则明显增大。     

Observations of ionospheric irregularities and its correspondence with sporadic e occurrence over South Korea and Japan

This study analyzed the occurrence of ionospheric irregularities over South Korea and Japan (mid-latitudes) during the years 2010–2015. The irregularities were quantified using the rate of change of total electron content (TEC) index (ROTI), which detects irregularities with scale sizes in the range of 400 m–2.5 km. The ROTI threshold for an ionospheric irregularity to have occurred was set as 0.1 TECU/min. Results showed that ionospheric irregularities mostly occur during night-time and around local noon-time in the seasons of spring and summer. In addition, the percentage of ionospheric irregularities had a high positive correlation with solar flux (F10.7) (r > 0.72). For the first time, we showed good correspondence between ionospheric irregularities measured by the ROTI index and sporadic E (Es). The median ROTI associated with ionospheric irregularities over a South Korea station (DAEJ) and a Japan station (KGNI) were 0.131 and 0.125 TECU/min, respectively. However, in severe cases of ionospheric irregularities, the ROTI values over DAEJ (KGNI) can reach 0.246 (0.217) and 0.314 (0.339) TECU/min during day and night, respectively. These critical ROTI values can be important in interpreting and monitoring ionospheric irregularity occurrence over South Korea and Japan.     

Characteristics of equatorial nighttime spread F – An analysis on season-longitude,solar activity and triggering causes

To understand global variability and triggering mechanisms of ionospheric nighttime equatorial spread F (ESF), we analyzed measurements from satellite and a ground-based GPS station for the years between 2010 and 2017. In this study we present seasonal-longitudinal as well as monthly variability of ESF occurrence for solar minimum and yearly variations of ESF occurrence for solar maximum and minimum periods. One of the long standing open questions in the study of ESF is what exactly initiates the Rayleigh-Taylor (RT) plasma instability growth. This question is the focus of the present work. Zonal background eastward electric field and E × B upward plasma drift speed patterns are found to be critically important in understanding plasma irregularity formation. In addition to particular patterns observed on these parameters, the background plasma density in the local evening hours just before the onset of ESF occurrence is very important. Stronger plasma densities just before the onset of irregularities resulted in stronger plasma irregularities, while relatively less dense plasma just before the onset of irregularities resulted in relatively lower plasma irregularities. Seasonal variations in ESF activity between March and September equinox seasons with comparable plasma densities can be defined in terms of the rate of change of solar flux F10.7 (dF10.7/day) index. Strongest ESF occurrence and strongest dF10.7/day are measured in the same month out of all other months in 2016 and 2017. Longitudinal variations of ESF activity in our measurements are related to longitudinal variations of plasma densities. We also found that ESF occurrence is better correlated with rate of change of F10.7 index for months in equinox seasons than for months in solstice seasons for the years between 2013 and 2016.     

Histogram-based ionogram displays and their application to autoscaling

A simple method is described for displaying and auto scaling the basic ionogram parameters foF2 and h’F2 as well as some additional layer parameters from digital ionograms. The technique employed is based on forming frequency and height histograms in each ionogram. This technique has now been applied specifically to ionograms produced by the IPS5D ionosonde developed and operated by the Australian Space Weather Service (SWS). The SWS ionograms are archived in a cleaned format and readily available from the SWS internet site. However, the method is applicable to any ionosonde which produces ionograms in a digital format at a useful signal-to-noise level. The most novel feature of the technique for autoscaling is its simplicity and the avoidance of the mathematical imaging and line fitting techniques often used. The program arose from the necessity to display many days of ionogram output to allow the location of specific types of ionospheric event such as ionospheric storms, travelling ionospheric disturbances and repetitive ionospheric height changes for further investigation and measurement. Examples and applications of the method are given including the removal of sporadic E and spread F.     

空间光学遥感器天然辐射效应数据库研究

空间环境是诱发卫星异常和故障的主要原因之一。光学遥感器作为卫星最重要的有效载荷之一，在空间会受到空间辐射环境的影响。因此在研制光学遥感器的同时，需要同时考虑空间辐射环境因素，文章就空间光学遥感器天然辐射效应数据库的设计和应用进行了介绍。     

K8E项目的管理控制评述

K8E工程是中国首次整机成套生产技术出口项目。其涉及面广、内容层次深、执行周期长、政治影响大、项目管理水平高。本文用项目的管理控制理论，对K8E工程项目的若干管理行为进行分析和评述。     

Statistical ionospheric E layer properties measured with the Cyprus Digisonde and comparisons with IRI predictions

This paper reports the diurnal, seasonal, and long term variability of the E layer critical frequency (foE) and peak height (hmE) derived from Digisonde measurements from 2009 to 2016 at the low-middle latitude European station of Nicosia, Cyprus (geographical coordinates: 35°N, 33°E, geomagnetic lat. 29.38°N, I = 51.7°). Manually scaled monthly median values of foE and hmE are compared with IRI-2012 predictions with a view to assess the predictability of IRI. Results show that in general, IRI slightly overestimates foE values both at low and high solar activity. At low solar activity, overestimations are mostly limited to 0.25?MHz (equivalent electron density, 0.775?×?10³?el/m^?3) but can go as high as 0.5?MHz (equivalent electron density, 3.1?×?10³?el/m^?3, during noon) around equinox. In some months, underestimations, though sporadic in nature, up to 0.25?MHz are noted (mostly during sunrise and sunset). At high solar activity, a similar pattern of over-/underestimation is evident. During the entire period of study, over-/under estimations are mostly limited to 0.25?MHz. In very few cases, these exceed 0.25?MHz but are limited to 0.5?MHz. Analysis of hmE reveals that: (1) hmE remains almost constant during ±2 to ±4?h around local noon, (2) hmE values are higher in winter than in spring, summer and autumn, (3) there are two maxima near sunrise and sunset with a noontime minimum in between. During the entire period of study, significant differences between observed hmE and the IRI predictions have been noted. IRI fails to predict hmE and outputs a constant value of 110?km, which is higher than most of the observed values. Over- and under estimations range from 3 to 13?km and from 0 to 3?km respectively.     

嫦娥工程数据接收分系统

嫦娥工程是我国发展深空探测走出的关键一步,意义重大。为和平应用空间资源,加强国际间的合作,在嫦娥工程中较完整地采用了CCSDS标准数据结构。文中介绍嫦娥工程数据接收分系统的主要功能、指标、组成以及目前的进展状态。