• Title/Summary/Keyword: STORM

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IMPACT OF THE ICME-EARTH GEOMETRY ON THE STRENGTH OF THE ASSOCIATED GEOMAGNETIC STORM: THE SEPTEMBER 2014 AND MARCH 2015 EVENTS

  • Cho, K.S.;Marubashi, K.;Kim, R.S.;Park, S.H.;Lim, E.K.;Kim, S.J.;Kumar, P.;Yurchyshyn, V.;Moon, Y.J.;Lee, J.O.
    • Journal of The Korean Astronomical Society
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    • v.50 no.2
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    • pp.29-39
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    • 2017
  • We investigate two abnormal CME-Storm pairs that occurred on 2014 September 10 - 12 and 2015 March 15 - 17, respectively. The first one was a moderate geomagnetic storm ($Dst_{min}{\sim}-75nT$) driven by the X1.6 high speed flare-associated CME ($1267km\;s^{-1}$) in AR 12158 (N14E02) near solar disk center. The other was a very intense geomagnetic storm ($Dst_{min}{\sim}-223nT$) caused by a CME with moderate speed ($719km\;s^{-1}$) and associated with a filament eruption accompanied by a weak flare (C9.1) in AR 12297 (S17W38). Both CMEs have large direction parameters facing the Earth and southward magnetic field orientation in their solar source region. In this study, we inspect the structure of Interplanetary Flux Ropes (IFRs) at the Earth estimated by using the torus fitting technique assuming self-similar expansion. As results, we find that the moderate storm on 2014 September 12 was caused by small-scale southward magnetic fields in the sheath region ahead of the IFR. The Earth traversed the portion of the IFR where only the northward fields are observed. Meanwhile, in case of the 2015 March 17 storm, our IFR analysis revealed that the Earth passed the very portion where only the southward magnetic fields are observed throughout the passage. The resultant southward magnetic field with long-duration is the main cause of the intense storm. We suggest that 3D magnetic field geometry of an IFR at the IFR-Earth encounter is important and the strength of a geomagnetic storm is strongly affected by the relative location of the Earth with respect to the IFR structure.

Development of a Web Service based GIS-Enabled Storm-surge Visualization System (웹 서비스 기반 GIS 연동 폭풍.해일 시각화 시스템 개발)

  • Kim, Jin-Ah;Park, Jin-Ah;Park, K.S.;Kwon, Jae-Il
    • Journal of KIISE:Computing Practices and Letters
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    • v.14 no.9
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    • pp.841-849
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    • 2008
  • Natural disaster such as inundation due to the typhoon induced storm-surge has inflicted severe losses on the coastal area. The problem of global warming and sea surface rising has issued and thus influences the increase of frequency and potential power of storm-surge. What we can do is to make intelligent effort to predict and prevent the losses through the early warning and prevention activity from the accurate prediction and forecasting about the time-varying storm-surge height and its arriving time resulted from the numerical simulation with sea observations. In this paper, we developed the web service based GIS-Enabled storm-surge visualization system to predict and prevent the storm-surge disasters. Moreover. for more accurate topography around coastal area and fine-grid storm-surge numerical model, we have accomplished GIS-based coastal mapping through LiDAR measurement.

GPS TEC Responses to Solar Flare Eruption and Geomagnetic Storm in 2011

  • Chung, Jong-Kyun;Lee, Chi-Na
    • Bulletin of the Korean Space Science Society
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    • pp.27.2-27.2
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    • 2011
  • The Total Electron Content (TEC) measured from Global Positioning System (GPS) can be continuously or peculiarly increased (positive ionospheric storm) or decreased (negative ionospheric storm) with solar and geomagnetic activities as well as the chemical and dynamic processes with thermosphere in the mid-latitudes. The ionospheric storm is not easy to predict owing to its difficult mechanism, and the real-time GPS TEC monitoring may be useful to follow ionospheric response to solar and geomagnetic storms. Korea Astronomy & Space Science Institute has continuously monitor GPS TEC over Korea Peninsula in near real-time of 10 minutes to watch activities. In this presentation, we will report the variation of GPS TEC over Daejeon and JeJu in Korea during the period of solar flare eruption and geomagnetic storm events in 2011. These events in 2011 will be compared with the event in October 2003 and November 2004.

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Spatial analysis of Design storm depth using Geostatistical (지구통계학적 기법을 이용한 설계호우깊이 공간분석)

  • Ahn, Sang Jin;Lee, Hyeong Jong;Yoon, Seok Hwan;Kwark, Hyun Goo
    • Proceedings of the Korea Water Resources Association Conference
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    • pp.1047-1051
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    • 2004
  • The design storm is a crucial element in urban drainage design and hydrological modeling. The total rainfall depth of a design storm is usually estimated by hydrological frequency analysis using historic rainfall records. The different geostatistical approaches (ordinary kriging, universal kriging) have been used as estimators and their results are compared and discussed. Variogram parameters, the sill, nugget effect and influence range, are analysis. Kriging method was applied for developing contour maps of design storm depths In bocheong stream basin. Effect to utilize weather radar data and grid-based basin model on the spatial variation characteristics of storm requires further study.

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APPLICATION OF QUICKBIRD SATELLITE IMAGE TO STORM RUNOFF MODELLING

  • Kim, Sang-Ho;Lee, Mi-Seon;Park, Geun-Ae;Hong, Suk-Young;Choi, Chul-Uong;Kim, Seong-Joon
    • Proceedings of the KSRS Conference
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    • v.2
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    • pp.602-605
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    • 2006
  • This study is to apply QuickBird satellite image for the simulation of storm runoff in a small rural watershed. For a 1.05 $km^2$ watershed located in Goesan-Gun of Chungbuk Province, the land use from the QuickBird image was produced by on-screening digitising after ortho-rectifying using 2 m DEM. For 3 cases of land use, soil and elevation scale (1:5,000, 1:25,000 and 1:50,000), SCS (Soil Conservation Service)-CN (Curve Number) and the watershed physical parameters were prepared for the storm runoff model, HEC-HMS (Hydrological Modelling System). The model was evaluated for each case and compared the simulated results with couple of selected storm events.

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Study the effect of strong magnetic storm on the ionosphere of August 2003 in the China region

  • Debao, Wen;Yunbin, Yuan;Jikun, Ou;Xingliang, Huo
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • v.2
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    • pp.191-193
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    • 2006
  • The ionospheric strom evolution process was monitored during the 18 August 2003 magnetic strom over China, through inversion of the ionospheric electron density from GPS observations. The temporal and spatial variations of the ionosphere were analysed as a time series of ionospheric electron density profiles. Results show that the main ionospheric effects of the storm over China under consideration are: the positive storm phase effect usually happens in the low latitudinal ionospheric; the negative storm phase effect occurs in the middle latitude, and the equatorial anomaly structure can be found as well.

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A Study on Scale and Characteristics of Nonpoint Pollution Using STORM Model (STORM 모형을 이용한 비점오염원 부하의 규모와 특성에 관한 연구)

  • 김도연;이홍근
    • Journal of Environmental Health Sciences
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    • v.22 no.1
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    • pp.5-11
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    • 1996
  • The more accurate estimation of the pollutant loadings from nonpoint source is needed to evaluate water quality of water resources such as river and reservoir. Therefore this study was performed to grasp the scale and characteristics of pollutant. In this study, STORM model was applied to I-cheon district to estimate runoff and pollutant loading of SS, BOD, T-N and $PO_4-P$. The results estimated by STORM model were fitted well to surveyed water quality in flow, SS and BOD. The annual loadings were estimated to be 36,463 kg/$km^3$/yr of SS, 8,090 kg/$km^3$/yr of BOD, 4,435 kg/$km^3$/yr of T-N and 358 kg/$km^3$/yr of $PO_4-P$. It was also found that the monthly pollutant loadings of SS, BOD, $PO_4-P$ were greatest in May and T-N in April.

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Application of QuickBird Satellite Image to Storm Runoff Modeling

  • Kim, Sang-Ho;Lee, Mi-Seon;Park, Geun-Ae;Kim, Seong-Joon
    • Korean Journal of Remote Sensing
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    • v.23 no.1
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    • pp.15-20
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    • 2007
  • This study is to apply QuickBird satellite image for the simulation of storm runoff in a small rural watershed. For a $1.05km^2$ watershed located in Goesan-Gun of Chungbuk Province, the land use from the QuickBird image was produced by on-screening digitising after ortho-rectifying using 2 m DEM. For 3 cases of land use, soil and elevation scale (1:5,000, 1:25,000 and 1:50,000), SCS-CN and the watershed physical parameters were prepared for the storm runoff model, HEC-HMS (Hydrologic Modelling System). The model was evaluated for each case and compared the simulated results with couple of selected storm events.

Construction of Korean Space Weather Prediction Center: Storm Prediction Model

  • Kim, R.S.;Cho, K.S.;Moon, Y.J.;Yi, Yu;Choi, S.H.;Baek, J.H.;Park, Y.D.
    • Bulletin of the Korean Space Science Society
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    • pp.33.2-33.2
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    • 2008
  • Korea Astronomy and Space Science Institute (KASI) is developing an empirical model for Korean Space Weather Prediction Center (KSWPC). This model predicts the geomagnetic storm strength (Dst minimum) by using only CME parameters, such as the source location (L), speed (V), earthward direction (D), and magnetic field orientation of an overlaying potential field at CME source region. To derive an empirical formula, we considered that (1) the direction parameter has best correlation with the storm strength (2) west $15^{\circ}$ offset from the central meridian gives best correlation between the source location and the storm strength (3) consideration of two groups of CMEs according to their magnetic field orientation (southward or northward) provide better forecast. In this talk, we introduce current status of the empirical storm prediction model development.

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A Theoretical Study on Storm and Flood Insurance in Korea (풍수해보험에 대한 이론적 분석)

  • Kim, Kwang-ho
    • KDI Journal of Economic Policy
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    • v.33 no.4
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    • pp.119-142
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    • 2011
  • The storm and flood insurance, which was introduced recently to substitute the disaster relief system to moderate government's financial burden and enhance people's effort to reduce damage, seems to suffer various problems. This paper conducts a theoretical analysis on various aspects of the storm and flood insurance to provide insight on those issues and draw policy implications. First, the coexistence of disaster relief with the storm and flood insurance is likely to harm the penetration of the storm and flood insurance. Second, the current premium system is likely to induce people to make less efforts to reduce damage due to moral hazard problem. Third, current support for damage-reducing efforts may not fulfill its purpose and hence should be scrutinized carefully.

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