华北联网短波通讯中CCU故障处理方法

华北联网短波通讯中ＣＣＵ故障处理方法杨志刚，徐良爱，黄百锁（中国山西０４１０００临汾中心地震台）华北地区遥测地震台网联网（简称华北联网）于１９９２年９月通过国家地震局专家组的验收，投入运行两年来，较好地监测了大华北地区的地震活动，增强了首都围及华北地...     

华北遥测地震台网联网中心信号系统设计与实现

根据世界银行贷款项目——国家部分的总体设计和实施方案的要求,建立华北遥测地震台网联网中心。本文概括介绍了华北联网中心信号汇集与分配系统的设计与实现。     

华北联网中心的短波天线：华北地区遥测地震台网联网论文续五

对华北联网中心北京中心短波天线的设计，功能，安装方案作了较为详细的介绍。     

华北遥测地震台网联网定位能力

本文利用1992年北京遥测地震台网联网前和联网后所测定的957个近震的参数进行分析与比较,进而论证华北遥测地震台网联网的定位精度和范围。     

2014年5-10月全球M≥5．5地震动态

中国地震局地球物理研究所中国数字地震台网数据管理中心（CDSNDMC）根据美国地震联合研究会数据管理中心（IRISDMC）发布的2014年5—10月全球地震动态,通过修订后给出以下监测结果。2014年5-10月全球共发生M≥5．5地震205次。     

2010年10月22日加利福尼亚湾发生7.0级地震

中国地震台网中心和美国地质调查局（USGS）公布的该地震的参数如下： 1中国地震台网中心 发震时间：北京时间2010年10月22日01时53分;     

2009年10月8日瓦努阿图发生7．7级地震

中国地震台网中心和美国地质调查局（USGS）公布的该地震的参数如下： 1中国地震台网中心 发震时间：北京时间2009年10月8日6时3分;     

2010年10月25日苏门答腊西南发生7.3级地震

中国地震台网中心和美国地质调查局（USGS）公布的该地震的参数如下： 1中国地震台网中心 发震时间：北京时间2010年10月25日22时42分;     

在华北联网中临汾台网如何排除M700TY电台对768记录器的干扰

在华北遥测地震台网联网中,临汾台网与北京遥测地震台网联网中心是无线传输。其主要设备是IC-M700TY电台。该电台最大发射功率为100W,在传输中,直呼通话清晰,数传效果也较理想。但因该电台发射功率较大,高频自动天调与M700TY电台为分离的两部分,所以当电台发射信号(直呼通话与数字传输)时,对768记录器的干扰较大,有时768记录器     

华北联网中的山西台网

从联网的系统构成、联网设备及软件配置、联网产生的效益３个方面介绍了华北联网中山西台网的情况，总结了孤立的小网联结成大跨度的现代化监测网络的经验。     

Do CRISTA Experiment/Campaign Data Represent a Typical Situation or Not?

Data from four A3 radio wave circuits in central Europe are used to analyse the representativeness of the ionization and gravity wave activity pattern in the lower ionosphere (85 – 100 km) in the CRISTA experiment interval (3 – 12 November 1994) for the given conditions. It has been found that the CRISTA experiment interval was run under conditions, which are highly representative both of October – November 1994 and autumn, low-moderate solar activity, the descending phase of solar cycle conditions, i.e. CRISTA measurements may be considered to provide values identical with, or close to climatological values (at least for central Europe, h = 85 – 100 km).     

The LF radio anomaly observed before the Mw = 6.5 earthquake in Crete on October 12, 2013

On October 12, 2013, an earthquake with M_w = 6.5 occurred in the southern Hellenic Arc, approximately 20 km off the west coast of Crete. The main shock, the focal depth of which is on the order of 40 km, was followed by aftershocks felt in the nearby cities and villages, although the aftershock sequence was poor. The epicentre was located at approximately 60 km from a radio receiver in Crete (CRE), which belongs to the European VLF/LF Radio Network. Several days before the earthquake, a clear disturbance occurred in one of the ten radio signals that the CRE receiver sampled. The disturbance, which can be considered an anomaly, appeared in the 216 kHz radio signal radiated by the Radio Monte Carlo (MCO) transmitter. The radio path MCO-CRE crossed directly over the epicentre area of the aforementioned earthquake. In this work, we present a detailed analysis of the MCO signal anomaly using spectral tools. We also investigate the behaviour of other radio signals sampled by the CRE receiver and consider other possible causes of disturbances on the MCO radio signal. We conclude that the disturbance in the MCO radio signal is a convincingly possible precursor of the earthquake in Crete. Emission of electromagnetic waves with a frequency band that includes 216 kHz from the focal zone of the earthquake can provide a satisfactory explanation of the radio anomaly.     

Complex dynamics of repeating and river-blocking landslides in Jiangda during 2018

Two large landslides successively blocked the Jinsha River at the same location in Jiangda Village on October 10 and November 3,2018,respectively.The dynamic processes and possible interactions of the two landslides need to be studied to better understand the physical processes involved,and to provide information on future disaster mitigation.We investigated their force histories and sliding directions by inverting regional broadband seismograms.The scale of the October landslide was approximately three times that of the November event.The October event revealed a particularly strong deceleration force,which may have been caused by a collision between the sliding mass and ground surface.In contrast,the November event had a relatively weaker deceleration force,indicating that it may have been gradually stopped by the landslide dam formed during the October landslide.The sliding directions of the two landslides differed significantly in terms of both horizontal and vertical directions,indicating a change in their sliding surfaces.We conclude that unconsolidated materials at the top of the October landslide continued sliding along a curved slope during the November event.From our seismic models of dynamic processes,both the October landslide and local background may have affected and even changed a subsequent landslide's mechanism.     

射电日像仪天线及工作频率的设想

The article analysizes the current situation and opportunity of the development of radioheliograph in China. It provides an idea to construct the radioheliograph by three stepsfrom small sized,to middle sized,then tobig sized. Each step is to construct a complete radioheliograph. The article also analysizes some important technical performance,such as diameter of element antenna,overall pointing error and observing frequency.     

The Occurrence of Haze in Malaysia: A Case Study in an Urban Industrial Area

— Klang Valley, a heavily industrialized urban area in Malaysia, has experienced severe haze episodes since the early 1980s. Total Suspended Particulate matter (TSP) is used in studying this phenomenon. Three severe haze episodes during the early 1990s are reviewed; August 1990, October 1991, and August–October 1994. The nature of these episodes, their possible causes, and their major features are discussed. Meteorological conditions associated with these episodes were analyzed. Results of the study indicate that stability and trapping of particles are the main factors affecting the pollution during haze periods. Maximum total suspended matter (TSP) was recorded in October 1991. The August–October 1994 episode was the most persistent and least affected by meteorological variables. Analysis of wind direction data showed that southerly and southwesterly winds coincided with the worst haze periods.     

临汾无线遥测台网监控能力评述

根据吴开统等人提出的检验地震台网监测效能的几种方法,对临汾无线遥测台网的监控能力进行了检验,得出该遥测台网有较高观测精度的结论,找出了不足,提出了改进措施。     

Descriptive study of solar activity sudden increase and Halloween storms of 2003

During the declining phase of the last three solar cycles, secondary peaks have been detected 2–3 years after the main peak of sunspot number. The main peak of cycle 23 was in 2001, but a sudden increase of the solar activity occurred during the period October 17 to November 10, 2003 (the so-called Halloween storms). A similar storm occurred 1 year later, during the period October 3 to November 13, 2004. These events are considered as secondary peaks during the declining phase of cycle 23. Secondary peaks during declining phase of the last 10 solar cycles were detected by Gonzalez and Tsurutani [1990. Planetary and Space Science 38, 181–187]. During Halloween storm period, the sunspot area increased up to 1.11×10^?9 hemisphere on October 19, and grow up to 5.69×10^?9 hemisphere on October 30, 2003. Then it decreased to 1.11×10^?9 hemisphere on November 4, 2003. Also, the radio flux of λ=10.7 cm increased from 120 sfu on October 19, to 298 sfu on October 26, 2003, then decreased to 168 sfu on November 4, 2003. Two eruptive solar proton flares were released on 26 and 28 October 2003, the latter being the most eruptive flare recorded since 1976 (values reaching X17/4B).The aim of this study is to follow the morphological and magnetic changes of the active region before, during, and after the production of high-energy flares. Furthermore, the causes of release of these eruptive storms have been discussed for the period, October–November 2003, during the declining phase of the solar cycle 23.     

In memoriam: Gennady Aleksandrovich Fonarev October 8, 1933–October 13, 2010

Obituary

In memoriam: Gennady Aleksandrovich Fonarev October 8, 1933–October 13, 2010     

Effect of Antarctic ozone holes of 1988, 1989, and 1990 on lower latitudes of the southern hemisphere

The October depletions in the Antarctic ozone spread to lower latitudes in early November in 1988, in late November in 1989, and in late October in 1990. The depletions were 10-15% for latitudes up to 40°S and smaller thereafter, and almost negligible at 25°S and beyond. However, for the southern hemisphere, the normal seasonal changes at middle latitudes from October to December are much larger (about 20%). Also, there are superposed fluctuations of about 20% over a few (5-6) days.     

人造双行星与地球组成的太阳和行星际观测网

A Solar and interplanetary observational system composed of two artificial planets and the earth is suggested for the solar-terrestrial study and prediction.The two planets should move along the earth's orbit around the sun. The angle distance between the two planets and between them with the earth is 120°. This system can be used to improve greatly the short-term,midiu-mterm solar activity predictions and monitor an earth-toward coronal mass ejection,giving an accurate warning of a solar-terrestrial disturbance. Observational data obtained by this system would be very useful in a model work of solar wind and an evolution study of structures in solar atmosphere such as solar active regions and magnetic fields with various scales.