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1998年4-5月地球同步轨道MeV电子通量增强事件
Alternative TitleMe V ELECTRON2FLUX ENHANCEMENT EVENTS AT THE GEOSYNCHRONOUS ORBIT IN APRIL-MAY 1998
周国成; 汪学毅; 王德驹; 曹晋滨; 蔡春林; 北京8701信箱
Department空间天气学国家重点实验室
Source Publication地球物理学报
2001
Volume44Issue:3Pages:293-302
ISSN0001-5733
Language中文
Keyword电子通量增强事件 地球同步轨道 行星际扰动 磁暴 1998年
Abstract采用GOES-9卫星观测的能量大于2MeV和大于4MeV电子通量和行星际飞船ACE太阳风参数的高时间分辨率资料,以及磁暴指数Dst资料,分析了1998年4-5月期间地球同步轨道电子通量增强事件的时间和能量响应特征及其与行星际太阳风参数,磁暴和亚暴等扰动条件的对应关系,结果表明,地球同步轨道相对论性(MeV)电子通量增强事件有明显的周日变化,中千极大和千夜极小,4月22日和5月5日开始的两次大事件中,能量大于2MeV电子通量中千极大值上升到最大值的时间尺度分别约为4天和1天,中千极大值高于背景水平的持续时间分别为13天(4月22日-5月4日)和16天(5月4日-20日)以上,每次MeV电子通量增强事件的能量范围不完全相同,两次大事件的上升段都对应于磁暴的恢复相,与太阳风动压脉冲,高速流脉冲和负Bz分量关系密切.
Other AbstractThe time and energy response characteristics of the relativistic (MeV) elect ronflux enhancement events at the geosynchronous orbit are analyzed and compared to the inter-planetary disturbances and magnetic storms by using the high resolving data for the satellite GOES29 elect ron fluxes and the spacecraft ACE solar-wind parameters in April-May 1998.The results show that there was the daily variation for the MeV elect ron flux at the geosyn-chronous orbit,the maximum flux at about the noon and minimum flux at about the midnight.In two great event s starting at the geosynchronous orbit on April 22 and May 5,1998,the rising time scales of the noon maximum flux up to the peak fluxes for elect rons of the energy > 2MeV are for about 4 days and 1 day,respectively.The continued times of the noon maximum fluxes (greater than background level)are 13 days(from April 22 to May 4)and 16 days (f rom May 5 to 20) ,respectively.The energetic ranges for the MeV elect ronflux enhancement event s are not same exactly.The rising phases for two great event s in April-May correspond to the recovery phases of storms and are closely associated with the solar-wind dynamic pressure pulse,the high2speed flow pulse ,and the negative Bz component of the interplanetary magnetic field ( IMF).
Funding Project中国科学院空间科学与应用研究中心
Document Type期刊论文
Version出版稿
Identifierhttp://ir.nssc.ac.cn/handle/122/1291
Collection空间科学部
Corresponding Author北京8701信箱
Recommended Citation
GB/T 7714
周国成,汪学毅,王德驹,等. 1998年4-5月地球同步轨道MeV电子通量增强事件[J]. 地球物理学报,2001,44(3):293-302.
APA 周国成,汪学毅,王德驹,曹晋滨,蔡春林,&北京8701信箱.(2001).1998年4-5月地球同步轨道MeV电子通量增强事件.地球物理学报,44(3),293-302.
MLA 周国成,et al."1998年4-5月地球同步轨道MeV电子通量增强事件".地球物理学报 44.3(2001):293-302.
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