Lidar observations of neutral Fe layers and fast gravity waves in the thermosphere (110-155 km) at McMurdo (77.8°S, 166.7°E), Antarctica

被引：100

作者：

Chu, Xinzhao ^{[1
,2
]}

Yu, Zhibin ^{[1
,2
]}

Gardner, Chester S. ^{[3
]}

Chen, Cao ^{[1
,2
]}

Fong, Weichun ^{[1
,2
]}

机构：

[1] Univ Colorado, Cooperat Inst Res Environm Sci, Boulder, CO 80309 USA

[2] Univ Colorado, Dept Aerosp Engn Sci, Boulder, CO 80309 USA

[3] Univ Illinois, Dept Elect & Comp Engn, Urbana, IL 61801 USA

来源：

GEOPHYSICAL RESEARCH LETTERS | 2011年 / 38卷

基金：

美国国家科学基金会;

关键词：

UPPER-ATMOSPHERE; CHEMISTRY; ARECIBO; RADAR; MODEL; ION;

D O I：

10.1029/2011GL050016

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

We report the first lidar observations of neutral Fe layers with gravity wave signatures in the thermosphere from 110-155 km at McMurdo, Antarctica in May 2011. The thermospheric Fe densities are low, ranging from similar to 200 cm(-3) at 120 km to similar to 20 cm(-3) at 150 km. The measured temperatures from 115-135 km are considerably warmer than MSIS and appear to be related to Joule heating enhanced by aurora. The observed waves originate in the lower atmosphere and show periods of 1.5-2 h through 77-155 km. The vertical wavelength increases from similar to 13 km at 115 km to similar to 70 km at 150 km altitude. These wave characteristics are strikingly similar to the traveling ionospheric disturbances caused by internal gravity waves. The thermospheric Fe layers are likely formed through the neutralization of vertically converged Fe(+) layers that descend in height following the gravity wave downward phase progression. Citation: Chu, X., Z. Yu, C. S. Gardner, C. Chen, and W. Fong (2011), Lidar observations of neutral Fe layers and fast gravity waves in the thermosphere (110-155 km) at McMurdo (77.8 degrees S, 166.7 degrees E), Antarctica, Geophys. Res. Lett., 38, L23807, doi: 10.1029/2011GL050016.

引用

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