Dynamics of Low-latitude Thermosphere-Ionosphere from Coincident Observations of Zonal Neutral Winds and EPB Velocity from Brazil and Peru

TitleDynamics of Low-latitude Thermosphere-Ionosphere from Coincident Observations of Zonal Neutral Winds and EPB Velocity from Brazil and Peru
Publication TypeConference Talk
Year of Publication2013
AuthorsChapagain, NP, Makela, JJ, Meriwether, JW, Fisher, DJ, Chau, JL, Buriti, R
Conference NameAGU Meeting of the Americas
Date Published05/2013
Conference LocationCancun, Mexico
Abstract

The Remote Equatorial Nighttime Observatory of Ionospheric Regions (RENOIR) experiment comprises a suite of instruments operating in northeastern Brazil at Cajazeiras (6.86°S, 38.56°W) and Cariri (7.38°S, 36.53°W) since 2009. This experiment consists of a wide-angle imaging system at Cajazeiras and Fabry-Perot interferometers (FPI) at each site. As part of a separate experiment, two FPIs were deployed in western Peru at Merihill (11.96°S, 76.86°W) and Nazca (14.97°S, 74.89°W) in 2010. In this presentation, we discuss the results obtained from these experiments. When operating individually, each FPI provides measurements of the zonal or meridional neutral winds in the cardinal look directions. A second mode is available, the common volume mode, in which two FPIs (in either Brazil or Peru) make coordinated and collocated measurements of both the zonal and meridional winds. Using the resultant data, we present the climatology of thermospheric neutral winds during the transition from the deep solar minimum to the impending solar maximum conditions from both the east and west coasts of South America. Furthermore, we discuss the coupling between the thermosphere and ionosphere through an analysis of coincident observations of the zonal neutral winds and the drift velocities of Equatorial Plasma Bubbles (EPBs). The results show the neutral winds and EPB drift velocities agree well, illustrating that the F-region dynamo is, in general, fully developed. However, in the early evening hours, the EPB drift velocity is slower than that of the neutral winds on several occasions suggesting the F-region dynamo is not fully activated during the development phase of the EPBs.