Large Alfvén wave power in the plasma sheet boundary layer during the expansion phase of substorms
Large Alfvén wave power in the plasma sheet boundary layer during the expansion phase of substorms
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DOI：
10.1029/2000gl000127
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发表时间：
2000-10
影响因子：
5.2
通讯作者：
A. Keiling;J. Wygant;C. Cattell;M. Temerin;F. Mozer;Craig A. Kletzing;J. Scudder;Christopher T. Russell;W. Lotko;A. Streltsov
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文献类型：
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作者：
A. Keiling;J. Wygant;C. Cattell;M. Temerin;F. Mozer;Craig A. Kletzing;J. Scudder;Christopher T. Russell;W. Lotko;A. Streltsov
在地心距离为4至6 RE和22至3小时磁当地时间之间，极地卫星对等离子体片边界层中大坡印廷通量的观测与地面磁力计记录的H-bay特征相关。我们提供的证据表明，大坡印亭通量发生在亚暴膨胀阶段。坡印廷通量超过1尔格/cm²s（在100公里范围内为125尔格/cm²s），主要指向电离层，并与阿尔文波有关。这些观测表明，在亚暴最活跃的阶段，阿尔文波功率作为从遥远的磁尾向电离层输送能量的一种手段具有重要意义。
Observations by the Polar satellite of large Poynting flux in the plasma sheet boundary layer at geocentric distances of 4 to 6 RE and between 22 and 3 hrs magnetic local time were correlated with H‐bay signatures from ground magnetometer records. We provide evidence that large Poynting fluxes occur during the substorm expansion phase. The Poynting fluxes exceeded 1 ergs/cm²s (125 ergs/cm²s when mapped to 100 km), were dominantly directed toward the ionosphere, and were associated with Alfvén waves. These observations demonstrate the importance of Alfvén wave power as a means of energy transport from the distant magnetotail to the ionosphere during the most dynamic phase of substorms.