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자료유형
학술저널
저자정보
신대규 (충북대학교) 이대영 (충북대학교) 김진희 (충북대학교) 조정희 (충북대학교)
저널정보
한국우주과학회 Journal of Astronomy and Space Sciences Journal of Astronomy and Space Sciences 제31권 제4호
발행연도
2014.12
수록면
303 - 309 (7page)
DOI
http://dx.doi.org/10.5140/JASS.2014.31.4.303

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The Earth’s outer radiation belt often suffers from drastic changes in the electron fluxes. Since the electrons can be apotential threat to satellites, efforts have long been made to model and predict electron flux variations. In this paper, wedescribe a prediction model for the outer belt electrons that we have recently developed at Chungbuk National University. The model is based on a one-dimensional radial diffusion equation with observationally determined specifications of afew major ingredients in the following way. First, the boundary condition of the outer edge of the outer belt is specified byempirical functions that we determine using the THEMIS satellite observations of energetic electrons near the boundary. Second, the plasmapause locations are specified by empirical functions that we determine using the electron density dataof THEMIS. Third, the model incorporates the local acceleration effect by chorus waves into the one-dimensional radialdiffusion equation. We determine this chorus acceleration effect by first obtaining an empirical formula of chorus intensityas a function of drift shell parameter L*, incorporating it as a source term in the one-dimensional diffusion equation, andlastly calibrating the term to best agree with observations of a certain interval. We present a comparison of the model runresults with and without the chorus acceleration effect, demonstrating that the chorus effect has been incorporated into themodel to a reasonable degree.

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