159 research outputs found
Understanding space weather and space climate from Antarctica
The Tenth Symposium on Polar Science/Special session: [S] Future plan of Antarctic research: Towards phase X of the Japanese Antarctic Research Project (2022-2028) and beyond, Tue. 3 Dec. / 2F Auditorium, National Institute of Polar Researc
Interplanetary particle transport simulation for warning system for aviation exposure to solar energetic particles
Solar energetic particles (SEPs) are one of the extreme space weather
phenomena. A huge SEP event increases the radiation dose received by aircrews,
who should be warned of such events as early as possible. We developed a
warning system for aviation exposure to SEPs. This article describes one
component of the system, which calculates the temporal evolution of the SEP
intensity and the spectrum immediately outside the terrestrial magnetosphere.
To achieve this, we performed numerical simulations of SEP transport in
interplanetary space, in which interplanetary SEP transport is described by the
focused transport equation. We developed a new simulation code to solve the
equation using a set of stochastic differential equations. In the code, the
focused transport equation is expressed in a magnetic field line coordinate
system, which is a non-orthogonal curvilinear coordinate system. An inverse
Gaussian distribution is employed as the injection profile of SEPs at an inner
boundary located near the Sun. We applied the simulation to observed SEP events
as a validation test. The results show that our simulation can closely
reproduce observational data for the temporal evolution of particle intensity.
By employing the code, we developed the WArning System for AVIation Exposure to
Solar energetic particles (WASAVIES).Comment: 23 pages, 11 figures, accepted for publication in Earth, Planets and
Spac
The behavior of the cusp in various solar wind conditions
The Tenth Symposium on Polar Science/Ordinary sessions: [OS] Space and upper atmospheric sciences, Wed. 4 Dec. /Entrance Hall (1st floor) at National Institute of Polar Research (NIPR
Modeling of the 22-year variation in the solar modulation of galactic cosmic rays
第6回極域科学シンポジウム[OS] 宙空圏11月16日(月) 国立極地研究所1階交流アトリウ
Magnetohydrodynamic Modeling of Solar Wind and Coronal Mass Ejections on the Basis of Solar Observations
第6回極域科学シンポジウム[OS] 宙空圏11月16日(月) 国立極地研究所 2階 大会議
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