국내 최대 기계 및 로봇 연구정보

기술보고서

기술보고서 게시판 내용
타이틀	Rapid Rebuilding of the Outer Radiation Belt
저자	Glocer, A.;; Fok, M.-C.;; Nagai, T.;; Toth, G.;; Guild, T.;; Bkake, J.
Keyword	ELECTRODYNAMICS;; ELECTRONS;; FLUX (RATE); OUTER RADIATION BELT;; RADIATION MEASUREMENT;; RADIATION MEASURING INSTRUMENTS;; RADIATION TRANSPORT;; SIMULATION;; SPACE WEATHER;; WAVE-PARTICLE INTERACTIONS
URL	http://dx.doi.org/10.1029/2011JA016516
보고서번호	GSFC.JA.5299.2011
발행년도	2011
출처	NTRS (NASA Technical Report Server)
ABSTRACT	Recent observations by the radiation monitor (RDM) on the spacecraft Akebono have shown several cases of greater than 2.5 MeV radiation belt electron enhancements occurring on timescales of less than a few hours. Similar enhancements are also seen in detectors on board the NOAA/POES and TWINS 1 satellites. These intervals are shorter than typical radial diffusion or wave-particle interactions can account for. We choose two so-called "rapid rebuilding" events that occur during high speed streams Ɣ September 2008 and 22 July 2009) and simulated them with the Space Weather Modeling Framework configured with global magnetosphere, radiation belt, ring current, and ionosphere electrodynamics model. Our simulations produce a weaker and delayed dipolarization as compared to observations, but the associated inductive electric field in the simulations is still strong enough to rapidly transport and accelerate MeV electrons resulting in an energetic electron flux enhancement that is somewhat weaker than is observed. Nevertheless, the calculated flux enhancement and dipolarization is found to be qualitatively consistent with the observations. Taken together, the modeling results and observations support the conclusion that storm-time dipolarization events in the magnetospheric magnetic field result in strong radial transport and energization of radiation belt electrons.