TC-1和Cluster对向阳侧磁层顶通量传输事件的联合观测研究

2004年2至4月期间,探测一号(TC-1)卫星和Cluster卫星有25次同时处在向阳侧磁层顶附近的磁鞘内,TC-1卫星在低纬区,Cluster卫星在中高纬区.利用这一期间两卫星探测到的27个通量传输事件(FTE),分析行星际磁场(IMF)横向分量BT={By,Bz}对磁层顶重联发生位置的影响,以及分量重联的观测事实,得到如下主要结果.(1)当IMF南向分量Bz占优势(|Bz|＞|By|)时,FTE大多(约占87.5%)能在低纬观测到,而当IMF By分量占优势(|Bz|＜|By|)时,则FTE大部分能在中高纬观测到(占84.2%);(2)很少观测到相关联的事件(关联事件指在低纬生成的FTE,向高纬运动中先后被TC-1卫星和Cluster卫星探测到的事件),表明在低纬形成的FTE可能大多沿磁层顶两侧滑向磁尾,只有少数可能运动到高纬地区;(3)中纬地区探测到的FTE大多是以分量重联方式产生于该区,而非来自磁赤道附近成对形成的FTE. 

Jointly Study on Flux Transfer Events Using the Data Observed by TC-1 and Cluster Near Dayside Magnetopause

One of the Double Star satellite TC-1 and Cluster both in the magnetosheath near the dayside magnetopause amount to 25 times from February to April, 2004, when TC-1 in the low latitude and Cluster in the middle or high latitude region. 27 Flux Transfer Events （FTEs） had been detected by these satellite during that interval. This paper analyzed the influence of the transverse component of the Interplanetary Magnetic Field （IMF） on the position at the magnetopause where the reconnection occurs, and searched the evidence of component reconnection. The main results are as follows: （1） when IMF southward component Bz is dominate （｜Bz｜ 〉 ｜By｜）, 87.5% of FTEs were detected at low latitude by TC-1, but when IMF ｜Bz｜〈 ｜By｜, most FTEs （about 84.2%） were observed at middle or high latitude by Cluster; （2） there were a few correlative events （the correlative event means a event was observed by TC-1 and Cluster at low- and high-latitude, successively）, this imply that most of the FTEs which occurred in lower latitude moved along the sides of the magnetosphere toward the magnetotail, only a few of them over the high-latitude; （3） most FTEs detected at middle latitude were not come from the equator, but burn at that region by the mode of component reconnection.