Comparison of meteor radar and TIDI winds in the Brazilian equatorial region

IF 1.7 4区地球科学 Q3 ASTRONOMY & ASTROPHYSICS

Annales Geophysicae Pub Date : 2023-07-18 DOI:10.5194/angeo-2023-23

Ana Roberta Paulino, Delis Otildes Rodrigues, Igo Paulino, Lourivaldo Mota Lima, Ricardo Arlen Buriti, Paulo Prado Batista, Aaron Ridley, Chen Wu

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引用次数: 0

Abstract

Abstract. Using data collected from a meteor radar deployed at São João do Cariri (7.4°, 36.5° S) and the TIMED Doppler Interferometer (TIDI) on board the Thermosphere-Ionosphere-Mesosphere Energetics and Dynamics (TIMED) satellite for 2006, comparisons of the horizontal winds (meridional and zonal components) were made in order to evaluate these techniques for scientific investigation and pointed out advantages of each instrument. A grid of ± 5 degrees of latitude and longitude centered at São João do Cariri was used to calculate the mean winds from the TIDI, which have a resolution of 2.5 km altitude starting from 82.5 km up to 102 km altitude. Otherwise, the meteor radar computes the winds for 7 layers of 4 km thickness overlapping 0.5 km above and below, which produces layers spaced by 3 km from 81 to 99 km altitude. When almost simultaneous measurements were compared, substantial discrepancies were observed in the vertical wind profiles. It happened because the meteor radar uses one hour bin size to estimate the wind from the echoes detected in the whole sky. While the TIDI measures instantaneous winds from the airglow emissions. In contrast, when the longer period of observation was taken into account, the meteor radar daily winds, averaged within a time interval of one month, were smoothed and showed more clearly the characteristics of the propagation of tides. The responses of the horizontal wind to the intraseasonal, semiannual and annual oscillations were satisfactory for the both techniques.

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巴西赤道地区流星雷达和TIDI风的比较

摘要。利用部署在 o jo o do Cariri星(7.4°，36.5°S)的流星雷达和搭载在热层-电离层-中间层能量学与动力学(TIMED)卫星上的定时多普勒干涉仪(TIDI) 2006年收集的数据，对水平风(经向和纬向分量)进行了比较，以评估这些技术在科学调查中的应用，并指出每种仪器的优势。以 o jo o do Cariri为中心的经纬度±5度网格用于计算来自TIDI的平均风速，其分辨率为2.5公里，海拔从82.5公里到102公里。否则，流星雷达计算4公里厚的7层的风，上面和下面重叠0.5公里，产生从81公里到99公里高度间隔3公里的层。当几乎同时进行的测量比较时，在垂直风廓线中观察到实质性的差异。之所以会发生这种情况，是因为流星雷达使用一小时的尺度，根据在整个天空中探测到的回波来估计风的大小。而TIDI则测量气辉辐射产生的瞬时风。相比之下，当考虑到较长时间的观测时，流星雷达在一个月的时间间隔内平均的日风被平滑，更清楚地显示了潮汐传播的特征。水平风对季节内、半年和年波动的响应均令人满意。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Annales Geophysicae 地学-地球科学综合

CiteScore

4.30

自引率

0.00%

发文量

审稿时长

2 months

期刊介绍： Annales Geophysicae (ANGEO) is a not-for-profit international multi- and inter-disciplinary scientific open-access journal in the field of solar–terrestrial and planetary sciences. ANGEO publishes original articles and short communications (letters) on research of the Sun–Earth system, including the science of space weather, solar–terrestrial plasma physics, the Earth''s ionosphere and atmosphere, the magnetosphere, and the study of planets and planetary systems, the interaction between the different spheres of a planet, and the interaction across the planetary system. Topics range from space weathering, planetary magnetic field, and planetary interior and surface dynamics to the formation and evolution of planetary systems.