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 14 of 14 for “"Plasma sheet"”.
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MODELING OF PLASMA-SHEET CONVECTION: IMPLICATIONS FOR SUBSTORMS (MAGNETOSPHERE)
An answer is suggested to the question of why plasma and magnetic energy accumulate in the Earth's magnetotail to be released in sporadic events, namely substorms. It is shown that the idea of steady convection is inconsistent with the idea of slow, approximately lossless, plasma convection in a …
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UNDERSTANDING ION SPECTRAL DYNAMICS NEAR THE INNER EDGE OF THE PLASMA SHEET
… constitute the inner extent of access of the plasma sheet to the low L values and play an important role in the dynamics of the inner magnetosphere, yet no statistical results of their species dependence are available to date. This dissertation aims to examine the species dependence and …
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Effects of ionospheric oxygen on magnetospheric structure and dynamics
… regions of the ionosphere contributes to plasma sheet populations and (2) the effect of these oxygen populations on convection and global magnetospheric structure. I implement two empirical outflow models at the inner boundary of the recently-developed Multi-Fluid Lyon-Fedder-Mobarry MHD …
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Identifying Signatures of Plasma Waves and Reconnection Associated with Kelvin-Helmholtz Activity
… the shocked solar wind and magnetospheric plasma. Understanding the dynamics of the plasma processes at the magnetopause boundary is crucial to the study of plasma transport into the magnetosphere. Previous studies have shown that there exists a temperature asymmetry in the plasma sheet. …
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Solar wind entry into the magnetosphere under northward IMF conditions
<p>The state of the plasma sheet in the magnetosphere is usually observed to be hot (1-10 keV) and tenuous (∼0.1 cm-3). However, sometimes part of it is observed to be colder (< 1 keV) and denser (∼1 cm-3), and the plasma flow is almost stagnant. Much higher density (∼10 cm-3) plasma …
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Statistical study of oxygen+ transport from the cusp to the plasmasheet
… storm times, bringing more O+ to the near-earth plasma sheet. Interplanetary magnetic field (IMF) magnitude is the most effective driver for bringing O+ into the near-Earth lobes. It was also found that when IMF By is positive, O+ from the northern cusp/cleft tends to stream towards the dawnside …
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Setting Constraints on the Lunar Exosphere: A Comprehensive Analysis of Velocity Resolved Sodium and Potassium Line Profile Measurements
… that speculated the possible contribution of plasma sheet ions in the response of the exosphere during magnetotail passage. A large part of this work is focused on the analysis of sodium and potassium based on the near lunar plasma environment: (i.e., solar wind, magnetosheath, and …
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PARALLEL ELECTRIC FIELD ON AURORAL MAGNETIC FIELD LINES
… Region 1, Region 2, and the cusp region with the plasma sheet boundary layer, the near-Earth plasma sheet, and the magnetosheath, respectively. The results of this study provide observational information on the global distribution of parallel potential drops and the prevailing process of …
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Global Structure of the Nightside Proton Precipitation during Substorms using Simulations and Observations
<p>In regions of thin strong current sheets, the first adiabatic invariant of protons can be violated leading to pitch angle diffusion into the loss cone and ultimately auroral precipitation. The central plasma sheet typically provides a stretched enough magnetic field configuration to account for …
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Quantitative modeling of time-dependent phenomena in the magnetospheric magnetic field
… of the theta aurora, and shed light on the plasma sheet and magnetotail configurations associated with this phenomenon.
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Kinetic Modeling of Ionospheric Outflows Observed by the VISIONS-1 Sounding Rocket
<p>Plasma escape from the high-latitude ionosphere (ion outflow) serves as a significant source of 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 …
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Ion Temperatures in Earth's Inner Magnetosphere: Ring Current Dynamics, Transient Effects, and Data-Model Comparisons
… multiple regions which all exhibit unique plasma properties. The feedback processes between each region depend on geomagnetic activity levels and the preceding states of the solar wind and the respective magnetospheric regions. Of particular interest is understanding how ion temperatures …
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The Study of Magnetotail Dynamics and their Ionospheric Signatures using Magnetohydrodynamic Simulation Model: OpenGGCM
… . Since the ionosphere is the mirror of the plasmasheet, it can be used as a monitor of the magnetotail dynamics. Thus, it is of great importance to understand the coupling process between the ionosphere and the magnetosphere in order to interpret the ionosphere and ground observations …
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The Lunar Exosphere: Spatial and Temporal Variations of Sodium and Potassium Emissions from November 2013 to May 2014
… limb, resulting from either location of the role plasma sheet ions play in priming the lunar surface. While line width derived temperatures are indicative of an energetic source such as PSD, the large line widths during full Moon could be due to an observed red shift in velocities due to looking …