THE ASSOCIATION OF POLAR MESOSPHERE SUMMER ECHO LAYERS WITH TIDAL MODES

被引：18

作者：

WILLIAMS, PJS

JONES, GOL

PALMER, JR

RISHBETH, H

机构：

[1] BRITISH ANTARCTIC SURVEY,CAMBRIDGE CB3 0ET,ENGLAND

[2] UNIV SOUTHAMPTON,DEPT PHYS,SOUTHAMPTON SO17 1BJ,HANTS,ENGLAND

来源：

ANNALES GEOPHYSICAE-ATMOSPHERES HYDROSPHERES AND SPACE SCIENCES | 1995年 / 13卷 / 04期

关键词：

D O I：

10.1007/s00585-995-0454-8

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The occurrence of PMSEs with time of day shows a semi-diurnal variation with minima at 8 and 20 h LT. PMSE layers observed for more than 30 min show an average rate of descent of 2 km h(-1). These characteristics suggest the influence of tidal winds, When the observed steady wind and diurnal and semi-diurnal tides at EISCAT are added, the overall magnitude shows a time-variation which matches the occurrence of PMSEs, and the observed rate of descent, approximately 2 km h(-1). Atmospheric gravity waves also contribute to the velocity of the neutral wind. When the wave reinforces the background wind, the PMSEs are stronger and descend more rapidly, but when the wave-related velocity opposes the background wind the PMSE is weaker and it descends more slowly.

引用

页码：454 / 457

页数：4