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suprathermalparticleeventsobservedbywindspacecraftininterplanetaryspaceduring19951999andtheirclassification
LingPeng Sun; DeJin Wu; DeYu Wang
2008
Source Publicationscienceinchinaseriesetechnologicalsciences
ISSN1006-9321
Volume51Issue:9Pages:1542
AbstractFifty-five suprathermal particle events were selected from WIND observations between 1995 and 1999. Based on systematic analysis on the observational characteristics of these events a two-parameter (the rising time and the flux ratio of electrons to protons in each event) classification method was proposed to classify these events. The three classified classes are (1) impulsive electron events with the flux ratio of electrons to protons being bigger than 1 and rising time being shorter than 200 min, (2) impulsive proton events with the flux ratio being smaller than 1 and rising time being shorter than 200 min, and (3) gradual proton events with the flux ratio being smaller than 1 and the rising time being longer than 200 min. In the past, "impulsive solar electron events" were under intense research. However, because the selection standards of their velocity dispersions or pitch-angle distributions were inadequate, statistical surveys of selected events were different from each other and even some conclusions were not consistent with the theory, for example, the relation of type-III solar radio bursts to the "impulsive solar electron events". The first class of impulsive electron events are associated with type-III radio bursts and with clear velocity dispersions; therefore they ought to originate from the Sun. The second class of the events, which have short continuance time and usually are not associated with type-III radio bursts and without velocity dispersion, are still far away from interplanetary shocks and most of them do not one-to-one correspond to corrotating interacting regions (CIRs); such events are possible results of local interplanetary magnetic field reconnection or electromagnetic disturbances. Finally, about 2/3 gradual proton events of the third class occur with interplanetary shocks, the delay times of which are almost equal to the rising time. Some of these events can be understood as particle accelerations by shocks.
Language英语
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/30740
Collection中国科学院紫金山天文台
Affiliation中国科学院紫金山天文台
First Author Affilication中国科学院紫金山天文台
Recommended Citation
GB/T 7714
LingPeng Sun,DeJin Wu,DeYu Wang. suprathermalparticleeventsobservedbywindspacecraftininterplanetaryspaceduring19951999andtheirclassification[J]. scienceinchinaseriesetechnologicalsciences,2008,51(9):1542.
APA LingPeng Sun,DeJin Wu,&DeYu Wang.(2008).suprathermalparticleeventsobservedbywindspacecraftininterplanetaryspaceduring19951999andtheirclassification.scienceinchinaseriesetechnologicalsciences,51(9),1542.
MLA LingPeng Sun,et al."suprathermalparticleeventsobservedbywindspacecraftininterplanetaryspaceduring19951999andtheirclassification".scienceinchinaseriesetechnologicalsciences 51.9(2008):1542.
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