Phases and amplitudes of TIDs in the high latitude F-region observed by EISCAT

被引:37
作者
Hocke, K [1 ]
Schlegel, K [1 ]
Kirchengast, G [1 ]
机构
[1] GRAZ UNIV,INST METEOROL & GEOPHYS,GRAZ,AUSTRIA
来源
JOURNAL OF ATMOSPHERIC AND TERRESTRIAL PHYSICS | 1996年 / 58卷 / 1-4期
关键词
D O I
10.1016/0021-9169(95)00033-X
中图分类号
P4 [大气科学(气象学)];
学科分类号
0706 ; 070601 ;
摘要
Travelling Ionospheric Disturbances (TIDs) are the ionospheric response to gravity waves passing through the neutral atmosphere. They can be measured simultaneously as wavelike perturbations of the ionospheric electron density (N-e), field-aligned ion velocity (V-i), and ion and electron temperature (T-i and T-e) by the EISCAT radar at Tromso. In order to derive the average amplitude and phase relationships between N-e, V-i, T-i and T-e have selected 45 TIDs with periods in the range 30-150 min from EISCAT data of a quiet daytime F-region from November 1987 to December 1991. It is shown that there exist characteristic phase differences between the TID parameters which can be used to identify gravity waves in incoherent scatter data. Furthermore, we present height, profiles of the average phases and amplitudes of the various TID parameters. Finally, the spectral behaviour of the TID amplitudes is studied using the average power spectra of N-e, V-i, T-i and T-e. We conclude that the use of the incoherent scatter information of all TID parameters allows a sure identification of gravity waves in the thermosphere.
引用
收藏
页码:245 / 255
页数:11
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