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Item type:Publication, Comparison of MLT momentum fluxes over the Andes at four different latitudinal sectors using multistatic radar configurations(John Wiley and Sons Inc, 2022-02-27)The middle atmosphere over South America, particularly above the Andes mountain range, is known as one of the most dynamically active regions in the world. Previous studies have investigated wave dynamics at mesosphere and lower thermosphere (MLT) altitudes within this region, but only a handful of them have made use of continuous measurements provided by specular meteor radars (SMRs). Furthermore, it was only until recently that MLT horizontal wind gradients were estimated for the first time using Spread Spectrum Interferometric Multistatic meteor radar Observing Network (SIMONe) Argentina, a multistatic SMR network located in southern Patagonia. By observing larger amounts of meteors from different viewing angles, multistatic SMRs allow, among others, for more reliable momentum flux estimates. In this work, we explore and compare the summer and winter MLT momentum flux dynamics at low and middle latitude sectors over the Andes mountain range. We also investigate the intermittency of the total momentum flux over these sectors. For this purpose, we analyze measurements provided by four multistatic SMR networks: SIMONe Peru (12°S), Chilean observation network de Meteor radars (30°S), SIMONe Argentina (49°S) and multi-frequency Agile radar for investigations of the atmosphere-southern Argentina agile meteor radar (54°S). We find that the momentum flux dynamics can change considerably over distances of only a few hundred km (e.g., southern Argentina). On the other hand, the contributions of large momentum fluxes to the total flux can be similar between regions separated by thousands of km (e.g., between Peru and southern Argentina). - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Modeling formation of turbulent Sporadic-E clouds using realistic wind data(Frontiers Media SA, 2026-01-01)A high resolution two-dimensional multi-fluid model of sporadic-E layers was developed and driven with physically realistic mesosphere, lower thermosphere (MLT) winds measured over Albuquerque, New Mexico. The realistic E-region winds are produced by the HYdrodynamic Point-wise Environment Reconstructor (HYPER) model that ingests meteor derived wind observations from a Spread-spectrum Interferometric Multistatic meteor radar Observing Network (SIMONe) system combined with the Navier-Stokes equations to provide high resolution three-dimensional wind fields over time. Sporadic-E dynamics are simulated using both realistic winds from HYPER as well as idealized hyperbolic tangent windshears to compare and contrast. Overall, the model shows greater inhomogeneity and irregularity using realistic winds with no clear peaks in the spectra, unlike the periodic density structures from the idealized windshears. Furthermore, range-time-frequency (RTF) observations from a local ionosonde were used to compare sporadic-E observations with the simulations. In general, the simulations show Kelvin-Helmholtz billow formation during the periods with range-spread sporadic-E in ionosonde observations, but the ionosonde virtual heights are 5–10 km above the simulated peak densities, likely due to altitude limitations from meteor radar observations. Ultimately, the use of realistic winds to drive sporadic-E models provides more insight to study complex dynamics and decipher observations of turbulent layers.