Main-phase creation of "seed" electrons in the outer radiation belt

被引:40
作者
Obara, T
Nagatsuma, T
Den, M [1 ]
Miyoshi, Y
Morioka, A
机构
[1] CRL, Hiraiso Solar Terr Res Ctr, Hitachinaka, Ibaraki 3111202, Japan
[2] Tohoku Univ, Planetary Plasma & Atmospher Res Ctr, Sendai, Miyagi 9808578, Japan
来源
EARTH PLANETS AND SPACE | 2000年 / 52卷 / 01期
关键词
D O I
10.1186/BF03351612
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
During a geomagnetic storm in early November 1993, NOAA satellite observations revealed that a population of energetic electrons appeared in the center of the outer radiation belt during the main phase of the storm. At the beginning of the main phase of the magnetic storm, the number of electrons with energies from 30 keV to 100 keV increased rapidly and contributed to build up of the ring current. At the end of the main phase the flux of electrons with energies greater than 300 keV increased significantly. Akebono satellite observations showed that the flux of electrons with energies ranging from 300 keV to 950 keV increased late of the storm main phase and that the flux of electrons with energies from 950 keV to 2.5 MeV increased during the storm recovery phase. The electron flux increase observed by both NOAA and Akebono took place first in the central part of the outer radiation belt (L similar to 4) and propagated to higher L shells with a significant time delay. We think that the ring current electrons that appeared first and near L similar to 4 during the main phase seeded the subsequent increase in the flux of MeV electrons in the entire outer radiation belt.
引用
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页码:41 / 47
页数:7
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