Global ETD Search
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Showing 1 to 18 of 18 for “"Neutral Wind"”.
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Auroral Ion Upflows: Sources, High Altitude Dynamics, and Neutral Wind Effects
… frictional heating, electron precipitation, neutral winds, and higher-altitude density cavities. The unique signatures and detailed evolution of these upflows are examined through the use of Incoherent Scatter Radar data and a sophisticated ionospheric fluid model.</p> <p>A survey of solar …
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Observations of the thermosphere using measurements from long-term Fabry-Perot interferometers
… space. However, the ionosphere is coupled to the neutral region of the atmosphere, known as the thermosphere, and only through knowledge of the state parameters of both regions can accurate predictions of ionospheric phenomena be made during both quiet conditions and geomagnetic storms. As a …
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Three-dimensional wind measurements and modeling using a bi-static Fabry-Perot interferometer system in Brazil
… there are not equivalent amounts of data on neutrals in the thermosphere to pair with these plasma observations. The Remote Equatorial Nighttime Observatory for Ionospheric Regions (RENOIR) project consists of two observing systems stationed in northeastern Brazil in Cajazeiras (6.87S, …
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Driving Influences of Ionospheric Electrodynamics at Mid- and High-Latitudes
… through (1) the interaction of the solar wind with the magnetosphere, i.e. magnetic reconnection and (2) the collision of neutral molecules with ions leading to charged particle motions across the geomagnetic field, i.e. neutral wind dynamo. In this study we applied statistical and deep …
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F-region winds over the central polar cap
F-region neutral winds across the polar cap have been studied by utilizing a Fabry-Perot interferometer located at Eureka (89° CGM), Nunavut Territory, over a 2-winter period 1997/98 and 1998/99. The dependence of neutral winds on the interplanetary magnetic field (IMF) was studied with …
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Enabling Validation of a CubeSat Compatible Wind Sensor
… space science instrument that measures neutral wind characteristics in the upper atmosphere. Neutral gas interactions with plasma in the ionosphere/thermosphere are responsible for spacecraft drag, radio frequency disturbances such as scintillation, and other geophysical phenomena. REDD …
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Three-Dimensional Fluid Simulations of Mid-Latitude Ionospheric Processes with Hybrid Chebyshev/Fourier Pseudo-Spectral Methods
… model explored how velocity shear location and neutral wind direction affect turbulence spectra of the GDI and their associated power laws. Turbulence spectra for cases with no velocity profile and with different neutral wind directions are analyzed. The impact of velocity shear is studied by …
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Analysis of the Effect of the August 2017 Eclipse on the Ionosphere Using a Ray-trace Algorithm
… models; and quantification of the effect of the neutral wind velocity on the simulated eclipse data.
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Fourier spectral methods for numerical modeling of ionospheric processes
… material releases) in the presence of a neutral wind. The evolution of the irregularities is monitored and discussed. The simulation results agree with similar results obtained using finite difference methods. A comparison is made between the ionospheric depletion and enhancement …
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High-latitude coupling processes between thermospheric circulation and solar wind driven magnetospheric currents and plasma convection
… thermospheric processes driven by the solar wind and Interplanetary Magnetic Field (IMF) interaction with the Earth magnetosphere are highly variable parts of the complex dynamic plasma environment, which represent the coupled Magnetosphere – Ionosphere – Thermosphere (MIT) system. The solar …
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Ionospheric Disturbances: Midlatitude Pi2 Magnetospheric ULF Pulsations and Medium Scale Traveling Ionospheric Disturbances
… coupled to the sun, the magnetosphere, and the neutral atmosphere. The ionospheric state can significantly impact technological systems, especially those which utilize radio frequency energy. By studying ionospheric disturbances, it is possible to gain a deeper understanding of not only the …
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HF Radar Observations of Inter-Annual variations in Mid-Latitude Mesospheric Winds
… to study inter-annual variation in mesospheric winds. The specific aim was to determine whether or not a Quasi Biennial signature could be identified in the Saskatoon mesosphere, and if so, to understand its relationship with the equatorial stratospheric QBO. To achieve this goal, a technique …
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Ion-neutral coupling in the geomagnetically disturbed mid-latitude ionosphere as observed by SuperDARN HF radars and NATION Fabry-Perot Interferometers
… governed by interactions between the overlapping neutral constituents and ionospheric plasma. The mid-latitude thermosphere-ionosphere system is very complex owing to its sensitivity to both the polar and equatorial processes. The mid-latitudes is also a relatively unexplored and less understood …
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Impacts of Anisotropy, Wave Heating, and Neutral Winds on High-Latitude Ionospheric Dynamics
… chemical and collisional interactions with the neutral atmosphere are included. In order to facilitate comparisons with data, the model accepts as inputs the main drivers of ion upflow and outflow: particle precipitation, electric fields, ELF wave power, and neutral winds and densities. GEMINI-TIA …
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Near-optimal inversion of incoherent scatter radar measurements: coding schemes, processing techniques, and experiments
… field strength, conductivity, current, and neutral wind speed.