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- W1986389739 abstract "Understanding the origin and acceleration of magnetospheric relativistic electrons (MREs) in the Earth's radiation belt during geomagnetic storms is an important subject and yet one of outstanding questions in space physics. It has been statistically suggested that during geomagnetic storms, ultra‐low‐frequency (ULF) Pc‐5 wave activities in the magnetosphere are correlated with order of magnitude increase of MRE fluxes in the outer radiation belt. Yet, physical and observational understandings of resonant interactions between ULF waves and MREs remain minimum. In this paper, we show two events during storms on September 25, 2001 and November 25, 2001, the solar wind speeds in both cases were >500 km s−1 while Cluster observations indicate presence of strong ULF waves in the magnetosphere at noon and dusk, respectively, during a∼3‐hour period. MRE observations by the Los Alamos (LANL) spacecraft show a quadrupling of 1.1–1.5 MeV electron fluxes in the September 25, 2001 event, but only a negligible increase in the November 25, 2001 event. We present a detailed comparison between these two events. Our results suggest that the effectiveness of MRE acceleration during the September 25, 2001 event can be attributed to the compressional wave mode with strong ULF wave activities and the physical origin of MRE acceleration depends more on the distribution of toroidal and poloidal ULF waves in the outer radiation belt." @default.
- W1986389739 created "2016-06-24" @default.
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- W1986389739 date "2011-01-01" @default.
- W1986389739 modified "2023-10-16" @default.
- W1986389739 title "Acceleration of Magnetospheric Relativistic Electrons by Ultra-Low Frequency Waves: A Comparison between Two Cases Observed by Cluster and LANL Satellites" @default.
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- W1986389739 doi "https://doi.org/10.1063/1.3544334" @default.
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