Storm‐time penetration to low latitudes of magnetospheric‐ionospheric convection and convection‐driven thermospheric winds
Storm‐time penetration to low latitudes of magnetospheric‐ionospheric convection and convection‐driven thermospheric winds
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DOI：
10.1029/98gl02334
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发表时间：
1998-08
影响因子：
5.2
通讯作者：
C. Reddy;H. G. Mayr
中科院分区：
文献类型：
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作者：
C. Reddy;H. G. Mayr
根据DE-2卫星在两次磁暴期间的测量，我们发现：(1)磁层对流驱动的东西向高速离子流(1400m/S)穿透到低至30°的磁纬度，在45°-50°纬度出现较大的速度(2000-3000m/S)；(Ii)与上述离子流相关的高速度(300-640m/S)热层风。离子运动和中性运动的纬度结构和时间演变的相似性表明，纬向风是由磁层-电离层对流通过离子阻力驱动的。在如此低的纬度，这些由对流驱动的离子流和风的速度比从观测中报告的或当前模型预测的要大得多。
From DE‐2 satellite measurements during two magnetic storms, we show that (i) the magnetospheric convection‐driven east‐west ion flows of high velocities (1400 m/s) penetrate to magnetic latitudes as low as 30°, with larger velocities (2000–3000 m/s) appearing at 45°–50° latitudes, and (ii) high velocity (300–640 m/s) thermospheric winds appear in association with the above ion flows. The similarity of the latitude structures and time evolutions of the ion and neutral motions indicates that the zonal winds are driven by magnetospheric‐ionospheric convection through ion drag. These velocities of the convection‐driven ion flows and winds at such low latitudes are much larger than those reported from observations or predicted by current models.