Momentum source signatures in thermospheric neutral composition
Momentum source signatures in thermospheric neutral composition
复制标题
热层中性成分的动量源特征
DOI：
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发表时间：
1978
期刊：
影响因子：
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通讯作者：
C. R. Philbrick
中科院分区：
文献类型：
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作者：
H. Trinks;H. G. Mayr;C. R. Philbrick
S3-1和ESRO4卫星上的质谱计在靠近日侧极点的窄纬度带内测量了中性大气结构的扰动。扰动的特征是较轻和较重物种的同相变化。在地磁活动增强期间，它们出现在海拔200公里的纬度带上，范围约为5°-10°。结果表明，与离子对流相关的动量源驱动的热层风是造成这些扰动的主要原因。与动量源相关的窄结构特征叠加在焦耳加热引起的热层变化上。这两种效应可能同时存在，导致热层中中性气体成分的复杂响应模式。
Perturbations in the structure of the neutral atmosphere were measured in narrow latitude bands near the dayside polar cusp by mass spectrometers aboard the S3-1 and Esro 4 satellites. The disturbances are characterized by an in-phase variation of both the lighter and the heavier species. They are observed to occur in latitude bands of about 5°–10° extent in the altitude region of 200 km during periods of increased geomagnetic activity. It is suggested that thermospheric winds driven by momentum sources associated with ion convection are the predominant cause for these disturbances. The narrow structure features associated with the momentum source are superimposed on the thermospheric changes caused by Joule heating. Both effects may be present simultaneously, resulting in a complex response pattern of the neutral gas composition in the thermosphere.