Determinação do vento horizontal a partir da observação de ondas de gravidade de média escala na mesosfera e baixa termosfera.

Abstract

This work aims to propose an alternative methodology for estimating horizontal wind in the mesosphere and low thermosphere from the observation of simultaneous medium-scale gravity waves. For this purpose, experimental measurements from a consolidated database of images and meteoric winds collected at Cachoeira Paulista (22.67°S; 45°W) were used, as well as temperature profiles from the LIDAR deployed at São José dos Campos (23.15°S; 45.85°W). Twenty-seven nights were analyzed from 2007 to 2008, which presented simultaneous measurements of these instruments only the nights of 09/14/2007 and 10/10/2007 were used as case studies, because it was possible to characterize these simultaneous medium-scale gravity waves in more than one layer of aeroluminescence emission and consequentely the estimation of the vertical wavelegths were possible. Horizontal gravity wave parameters also needed to be obtained and the keogram technique was used for this. The horizontal wind was estimated from the gravity wave dispersion relation by Gossard and Hooke (1975), and comparisons were made with the measurements made by the meteoric radar.