摘要
行星际激波与地球磁层相互作用通常会导致日侧极光活动增强,随后沿着极光卵的晨昏两侧向夜侧扩展的激波极光.行星际激波也可能直接导致夜侧扇区极光活动增强,甚至沉降粒子能通量的数量级可以与典型亚暴相比拟.本文首次利用我国南极中山站和北极黄河站连续多年积累的极光观测数据,对行星际激波与地球磁层相互作用期间地面台站在夜侧扇区(18—06MLT)观测的极光响应进行了分析.对18个极光观测事件的分析结果表明:行星际激波与磁层相互作用可以在夜侧触发极光爆发和极光微弱增强或静态无变化事件;太阳风-磁层能量耦合的效率以及磁层空间的稳定性决定着行星际激波能否触发极光爆发.
Interaction between interplanetary shock and magnetosphere frequently induces dayside enhancements of auroral activity, and subsequent enhancement of auroral precipitation referred as shock aurora propagating dawnward and duskward from noon to the night sector. In some cases, these interplanetary shocks also induce enhanced activity during which the power precipitated into the night sector may reach values as high as observed during typical magnetospheric substorms. Present study analyze the nightside auroral responses to the interplanetary shock sudden compression based-on the ground optical auroral observations from Chinese Antarctic Zhongshan and Arctic Yellow River stations for the first time. Of 18 shock associated aurora cases indicated that nightside auroral responses can be classified into auroral breakup and weak intensification or null events. Epoch time analysis showed that both the solar wind-magnetosphere coupling efficiency and electro-magnetic environment inside magnetosphere determine the nightside auroral responses.
出处
《地球物理学报》
SCIE
EI
CAS
CSCD
北大核心
2013年第6期1785-1796,共12页
Chinese Journal of Geophysics
基金
国家自然科学基金(40974083,41031064,40904041,41274149)
海洋公益项目(201005017)
国家重点基础研究发展计划“973计划”(2010CB950503-06)
南北极环境综合与评估专项(CHINARE2012-02-03)
中国极地对外合作项目(IC201303)资助
关键词
极光
行星际激波
极光爆发
南极中山站
北极黄河站
Aurora
Interplanetary shock
Auroral breakup
Zhongshan station
Yellow River station
