Southern hemisphere observations of a long-term decrease in F region altitude and thermospheric wind providing possible evidence for global thermospheric cooling
Southern hemisphere observations of a long-term decrease in F region altitude and thermospheric wind providing possible evidence for global thermospheric cooling
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DOI：
10.1029/98ja01629
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发表时间：
1998-09-01
影响因子：
2.8
通讯作者：
Rodgers, GA
中科院分区：
文献类型：
--
作者：
Jarvis, MJ;Jenkins, B;Rodgers, GA
F 区域峰值高度是根据来自阿根廷群岛（南纬 65 度，西经 64 度）和斯坦利港（南纬 52 度，西经 58 度）的 38 年数据系列的电离层缩放参数得出的，已对长期变化的特征进行了分析。在这两个地点都发现了海拔的长期变化，这种变化随月份和一天中的时间而变化。结果可以解释为高度的持续下降与热层风效应的减弱相结合，或者解释为与高度相关的高度的持续下降。当比较两个站点的结果时，两种解释都会出现不一致。估计的长期海拔下降与预计与温室气体相关的人为变化导致的热层下降的数量级相似。然而，不应排除其他可能性。
F region peak heights,.derived from ionospheric scaled parameters through 38-year data series from both Argentine Islands (65 degrees S, 64 degrees W) and Port Stanley (52 degrees S, 58 degrees W) have been analyzed for signatures of secular change. Long-term changes in altitude, which vary with month and time of day, were found at both sites. The results can be interpreted either as a constant decrease in altitude combined with a decreasing thermospheric wind effect or as a constant decrease in altitude which is altitude-dependent. Both interpretations leave inconsistencies when the results from the two sites are compared. The estimated long-term decrease in altitude is of a similar order of magnitude to that which has been predicted to result in the thermosphere from anthropogenic change related to greenhouse gases. Other possibilities should not, however, be ruled out.