Interpretation of an unusual high latitude density decrease in terms of thermospheric density cells
Interpretation of an unusual high latitude density decrease in terms of thermospheric density cells
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用热层密度细胞解释异常的高纬度密度下降
DOI：
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发表时间：
1995
期刊：
影响因子：
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通讯作者：
G. Crowley
中科院分区：
文献类型：
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作者：
J. Schoendorf;G. Crowley
高纬度热层（120-350公里）中性密度细胞结构的发现为解释高纬度密度数据提供了一个新的框架。在地磁活跃时期（约 170 公里以上），这些单元包括中午和午夜附近的密度增强以及黎明和黄昏附近的密度减少。在本文中，根据细胞提出并解释了先前无法解释的观察结果。一般来说，在磁活跃条件下，高纬度中性密度预计会增加。相反，SETA-1卫星在1979年4月3日的地磁风暴期间测量到近200公里处的密度下降了40%。过去，这种“异常”观测常常被归因于加速度计测量中密度和风的不可分离性。我们首先证明损耗不是由风引起的，然后证明损耗是 200 km 处质量密度固有的细胞结构的自然结果。
The discovery of a cellular structure in the high latitude thermospheric (120–350 km) neutral density provides a new framework in which to interpret high latitude density data. During geomagnetically active times, above about 170 km, the cells consist of density enhancements near noon and midnight and depletions near dawn and dusk. In this paper, a previously unexplained observation is presented and interpreted in terms of the cells. In general the high latitude neutral density is expected to increase during magnetically active conditions. On the contrary, the SETA-1 satellite measured a 40% density decrease near 200 km during the geomagnetic storm of April 3, 1979. In the past, such ‘anomalous’ observations have often been attributed to the inseparability of density and winds in accelerometer measurements. We first show that the depletion cannot be caused by winds, and then show that the depletion is a natural consequence of the cellular structure inherent in the mass density at 200 km.