지자기, 지전기 관측 및 응용 (1)
|서명||지자기, 지전기 관측 및 응용 (1)|
|초록||이 연구에서는 한국에서의 지자기 연속관측의 기초를 확립하기 위해서 적어도 한 대의 지자기 연속관측 시스템을 설치하고, 계속적인 관측을 수행, 그 자료를 보관하며, 이 관측자료에 대한 기초적인 해석 기술을 개발하는 데에 중점을 두었다. 이러한 자료를 한국에 현존하는 다른 3곳의 지자기 연속관측 시스템으로부터 나오는 자료와 연결시키고, 서로 비교, 검토, 종합 해석하는 망을 구성알 계획이다
In year 1990, one geomagnetic observation system of Model FLARE+ desinged and assembled by the British Geological Survey was installed in the campus of KIGAM. The IAGA (International Association of Geomagnetism and Aeronomy) has given to this geomagnetic observatory the international identification code DZN (Daezeon). Hereafter, this observatory will do the role of central observatory of a geomagnetic observatory network. This network is consisted of 4 observatories, including this newly installed one, and will be supplemented by 3 more observatories so that the global geometry of stations make a cross, centered at Daezeon approximately. Before the installation of the system, we have conducted a detailed magnetic survey on the candidate area, from the result of which the site of the real installation was selected so that the horizontal and vertical magnetic gradients were minimum. On the selected site, we have constructed 3 marble plinths for the setting of the instruments, and another remote marble plinth to use for a mark in case of absolute geomagnetic measurements. The direction of baseline from the absolute measurement plinth to the marking plinth has been determined by the Differential Global Positioning System (DGPS) to be 291。43′36.6″ from the True North. This baseline direction well be used hereafter for all the absolute geomagnetic measurements for the calibration of all the observed data by fluxgate magnetometer etc.During the installation, we have conducted total 6 sessions of absolute geomagnetic measurements, from the result of which the mean Declination of this site was calculted to be N7。20′59″ W, the mean Inclination 52。06′02″ down, the mean total magnetic intensity 50166.8 nT, the mean horizontal component 30819.4 nT, the mean vertical component 39583.7 nT. Such data will be used for the calibration and recalculation of the geomagnetic variation in the future. The work for connecting our observatory's data with all the other already existing geomagnetic observation data in Korea coming from 3 other geomagnetic observatories exterior to KIGAM via computer telecommunication lines are under continuation. The whole system comprises of mainly 2 magnetometers, one Oberhauser effect proton precession magnetometer (Model SM90R of Geomag Co., France) used for measurement of the total magnetic field intensity and another suspended type 3-axis fluxgate magnetometer (Model FGE version E of Danish Meteorological Institute) used for the measurement of the variation of the direction of the magneticfield. It gets the precise time signal from the GPS based synchronization subsystem and gets the precise temperature values inside the fluxgate magntometer via the thermotransducer installed in the fluxgate magnetometer itself, used for the future reduction of temperature effect of the measured variation of the magnetic field by the fluxgate mgnetometer. This system scans all the magnetic parameters once per 5 seconds and calculates the 1-minute values of all the measured values and saves them on the diskette drive in the data logger. But, we are doing some measures to get the 5 seconds values also and to save them in another computer through the optical fiber serial communication so that we could compare such data in real time with those measured and transferred to us via the computer telecommunication. All the observed data will be opened to be used not only for geology and geophysics but also for various fields such as navigation, surveying, map making, space physics, telecommunication, prediction of the hazards on conductive lines and pipelines and son on
|키워드||지자기, 지전기, 관측|
임무택. (1998). 지자기, 지전기 관측 및 응용 (1). 科學技術處.