Abstract
Abstract. The advantages of using a composite day analysis for all-sky interferometric meteor radars when measuring mean winds and tides are widely known. On the other hand, problems arise if this technique is applied to Hocking's (2005) gravity wave analysis for all-sky meteor radars. In this paper we describe how a simple change in the procedure makes it possible to use a composite day in Hocking's analysis. Also, we explain how a modified composite day can be constructed to test its ability to measure gravity wave momentum fluxes. Test results for specified mean, tidal, and gravity wave fields, including tidal amplitudes and gravity wave momentum fluxes varying strongly with altitude and/or time, suggest that the modified composite day allows characterization of monthly mean profiles of the gravity wave momentum fluxes, with good accuracy at least at the altitudes where the meteor counts are large (from 89 to 92.5 km). In the present work we also show that the variances measured with Hocking's method are often contaminated by the tidal fields and suggest a method of empirical correction derived from a simple simulation model. The results presented here greatly increase our confidence because they show that our technique is able to remove the tide-induced false variances from Hocking's analysis.
Highlights
(e2t0a0l9. )(2a0t 0t8h)refeorloTwri-vlaatnitdurduemloincatGthioeentsoroispncicBise,ranCzliteli,fmiFcersithtas from a simple simulation model
We have used a real spatial meteor distribution from one of our meteor radars located at Cachoeira Paulista (23◦ S, 45◦ W), (CP), and we have chosen a month in which the meteor count was very low, October 2005, in order to demonstrate the ability of the modified composite day in overcoming this issue
Based on tests that Fritts et al (2010) made to evaluate SAAMER’s abilities to measure gravity waves (GWs) momentum fluxes, we follow their procedure with the aim of doing the same for the Brazilian radars
Summary
(e2t0a0l9. )(2a0t 0t8h)refeorloTwri-vlaatnitdurduemloincatGthioeentsoroispncicBise,ranCzliteli,fmiFcersithtas from a simple simulation model. Andrioli et al.: Improved analysis of all-sky meteor radar measurements activity. In order to see if the variances measured by Hocking’s analysis are solely due to GW, we have made some simulations and have noted that in the presence of tides with short vertical wavelength, the variances increase and are modulated at the tidal period. Our aims in this paper are (1) to propose a modified composite day as a way to overcome the issue of low meteor counting in the analysis of all-sky meteor radar measurements for GW momentum flux determination, (2) to investigate the possible contamination of the variances derived from Hocking’s analysis by tides, (3) to propose a correction technique using a simple simulation model, and (4) to evaluate the ability of the Brazilian meteor radars to measure GW momentum flux using the improved analysis
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