Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm42a0834l&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SM42A-0834
Physics
2720 Energetic Particles, Trapped, 2740 Magnetospheric Configuration And Dynamics, 2764 Plasma Sheet, 2778 Ring Current, 2788 Storms And Substorms
Scientific paper
A statistical study has been carried out in order to investigate the evolution of geosynchronous substorm indicators, energetic particle injections and magnetic dipolarizations, during magnetic storms. The storm Dst index of all storm events of this study is distinguished by three phases: main, early recovery, and late recovery. It is found that the substorm indicators exhibit notable differences in different storm phases. First, during the main phase, the substorm indicators are most intense and occur over wide local time sectors in the nightside, being not limited to near-midnight sector only. As Dst develops into early and then late recovery phases, the substorm indicators become less intense and occur over less wide local time sectors compared to the main phase, and also their occurrence frequency greatly reduces. Further we find that most of the substorm indicators are well associated with the substorm geomagnetic bays. More interesting finding is that the time difference between the geosynchronous onset and the corresponding geomagnetic bay onset, Δ t, is within 5 minutes over wide local time sectors for many events during the main phase. In contrast, for early and late recovery phases, average Δ t clearly shows classic pattern of local time propagation with time delations. More implications will be discussed in this presentation.
Lee Daehee
Min Kyoung
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