Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 30 for “"ring current"”.
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A Dynamic Coupled Magnetosphere-Ionosphere-Ring Current Model
… boundary conditions to the RCM and the return of ring current plasma properties to the LFM. Crucial aspects of the coupling include the restriction of RCM to regions where field-line averaged plasma-beta <=1, the use of a plasmasphere model, and the MIX ionosphere model. Compared to stand-alone …
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Ring current -atmosphere interactions model with stormtime magnetic field
<p>An improved version of the ring current-atmosphere interactions kinetic model (RAM) is presented in this thesis. The recent stormtime empirical model T04s and the IGRF model are used to represent the Earth's external and internal magnetic fields respectively. Particle drifts, losses due to …
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Ion Temperatures in Earth's Inner Magnetosphere: Ring Current Dynamics, Transient Effects, and Data-Model Comparisons
… is understanding how ion temperatures evolve during geomagnetically active periods, and also understanding the space weather impacts of hot ion populations injected during such periods. Dynamic, spatiotemporally resolved ion temperature boundary conditions have been implemented into the …
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The effects of inductive electric field on the spatial and temporal evolution of the inner magnetospheric ring current
Made available in DSpace on 2021-03-05T21:38:01Z (GMT). No. of bitstreams: 2 LIU-THESIS-2020.pdf: 12573341 bytes, checksum: 5293a966df4f9376e751643cd04d98db (MD5) LICENSE.txt: 4210 bytes, checksum: e2c7b26887fb19eefa338d64dd85a467 (MD5) Previous issue date: 2020-11-25
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The role of N+ in the decay of the ring current during geomagnetic storms by means of charge exchange interactions
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2024-12-01
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Determining the role of neglected N+ heavy ions in the earth’s inner magnetosphere
… system. The contribution of N+ to the ring current population, in addition to that of O+, has long been neglected, primarily because most instruments flying in space could not distinguish between O+ and N+ due to their similar masses. For example, the magnetospheric missions, such as …
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Plasma flow in the magnetosphere under the influence of large scale electric field
… main field; 2) Dayside magnetosphere boundary current; 3) Quiet day ring current; and 4) Infinite neutral current sheet suggested by Mead. The driving mechanisms are due to co-rotation with the Earth, the gradient drift, and gross electric field drift. The drift paths for thermal plasma and …
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Quantification of the spatial structure and temporal variability of Earth's exosphere using optical tomography
… the tomographic approach through Kalman filtering allows, for the first time, analysis of the temporal evolution of global exospheric structure during periods of major disturbances in Earth's magnetic and plasma environment known as geomagnetic storms. This thesis presents several case studies …
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Decision tree application to satellite measurement and analysis of exospheric neutral densities
… the role of neutral dynamics in the evolution of ring current and the terrestrial magnetosphere as a whole. We study the role of the geocoronal density distribution in the ring current loss by incorporating different geocoronal models with the Hot Electron and Ion Drift Integrator (HEIDI) model …
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Investigation of Particle Trajectories in the Near-Earth Night-Side Magnetosphere Using Riometers
… play an important role in radiation belt and ring current dynamics. Injections have historically been studied primarily by data from particle detectors on satellites, causing gaps in our knowledge because these events are spatially large and highly structured and satellites provide only point …
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Quantification of Effect of Solar Storms on TEC over U.S. sector Using Machine Learning
… its intensity, and the rate of change of the ring current response. These parameters are inferred autonomously and compared to TEC values obtained from the CORS network of GPS stations. To quantify the effects we examine the difference between the storm-time TEC value and an average from 5 …
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Quantitative modeling of time-dependent phenomena in the magnetospheric magnetic field
… and extend the capabilities of the model. A new ring current parameterization improves the determination of storm-time fields in the inner magnetosphere. Replacement of the tail current module with a more flexible representation also contributes to improved accuracy in the inner magnetosphere, …
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Kinetic Modeling of Ionospheric Outflows Observed by the VISIONS-1 Sounding Rocket
… heavy plasma to magnetospheric plasma sheet and ring current regions. Outflows alter mass density and reconnection rates, hence global responses of the magnetosphere. The VISIONS-1 (VISualizing Ion Outflow via Neutral atom imaging during a Substorm) sounding rocket was launched on Feb. 7, 2013 at …
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Effect of Interplanetary Shock Impact Angle on the Occurrence Rate and Properties of Pc5 Waves Observed by High-Latitude Ground Magnetometers
… the surrounding plasma, leading to ionospheric current systems and an enhanced ring current. Their association with a time-varying EMF also makes them potentially dangerous at a human level. This EMF can couple to electrical currents in technological infrastructure that can overload …
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Solar-activity-based neutral hydrogen geocorona model
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2024-05-01
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The synthesis and chemistry of the cyclophanenes and their metal complexes
… geometry of the molecule and that the aromatic rings were bent outward in a slightly distorted boat form. A reciprocal relationship between deviations of the inner carbons from their basal planes and distances between the inner carbons was found by comparison of X-ray data of four …
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Nuclear Magnetic Resonance Studies of Ion Adsorption in Supercapacitor Electrodes
… show that the adsorbed species are subject to ring current effects, whereby the delocalised electrons in the carbon shield the nearby nuclei. The calculated effects depend on the local carbon structure, helping to rationalise the variations observed when different porous carbons are studied …
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Controlled precipitation of energetic Van Allen belt protons by electromagnetic ion cyclotron (EMIC) waves : scientific and engineering implications
… waves are naturally generated by equatorial ring current ions in the outer belt region, which explains the absence of EMIC waves at lower altitudes. Consequently, the precipitation of high-energy protons requires artificial generation of EMIC waves into the inner zone. The controlled removal …
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