THE THICKNESS OF THE MAGNETOPAUSE CURRENT LAYER - ISEE 1 AND 2 OBSERVATIONS
THE THICKNESS OF THE MAGNETOPAUSE CURRENT LAYER - ISEE 1 AND 2 OBSERVATIONS
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DOI：
10.1029/ja087ia04p02108
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发表时间：
1982-01-01
影响因子：
2.8
通讯作者：
RUSSELL, CT
中科院分区：
文献类型：
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作者：
BERCHEM, J;RUSSELL, CT
对ISEE飞行任务获得的双磁场剖面的分析为研究地球磁层边界提供了一个独特的机会。利用ISEE-1和ISEE-2两台磁力仪的磁场测量结果，对日侧磁层的磁层顶厚度进行了测量。由于可靠的测量只能对ISEE1和ISEE2之间的小间隔(<；1000公里)进行，我们的数据集仅限于当地时间0800到1700和GSM纬度2°到35°范围内的30个磁层顶交叉点。我们发现，磁层顶是一种恒定的快速不规则运动，80%的情况下速度在10公里/S到80公里/S之间，目前的薄片厚度在400到1000公里之间。按偶极子地磁纬度排序的厚度似乎比按GSM纬度排序要好得多。在磁赤道附近，磁层顶电流片最薄，平均约500公里。这一观察表明，重新连接是在赤道地区而不是在极点开始的。
The analysis of the dual magnetic field profile obtained by the ISEE mission provides a unique opportunity to study the earth's magnetospheric boundaries. A survey of the magnetopause thickness over the dayside magnetosphere is carried out by using the magnetic field measurements from the twin ISEE 1 and ISEE 2 magnetometers. Since reliable measurements are possible only for small separations (<1000 km) between ISEE 1 and 2 our data set is restricted to only thirty magnetopause crossings in the range of local time from 0800 to 1700 and at GSM latitude from 2° to 35°. We find that the magnetopause is in constant rapid and irregular motion with velocities ranging, in 80% of the cases, from 10 km/s to 80 km/s and with the current sheet thickness ranging from 400 to 1000 km. The thickness seems much better ordered by dipole mangetic latitudes than by GSM latitude. Near the magnetic equator the magnetopause current sheet is thinnest, about 500 km on average. This observation suggests that reconnection is initiated in the equatorial regions rather than in the polar cusps.