Dartmouth Digital Library Program

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Ring current oxygen interaction with micropulsations.
Ionospheric drift. ; Magnetospheric currents. ; Electric fields. ; Geomagnetic micropulsations. ; Active oxygen.
Dartmouth Dissertations

Investigating EMIC waves as a precipitation mechanism for relativistic electrons.
Loss processes greatly impact the dynamics of the Earth's radiation belts. In 1996, a balloon-borne germanium detector flown over Kiruna, Sweden detected the first terrestrial X-rays with energies on the order of 1 MeV. The spectrum for these...
Dartmouth Dissertations

The scaling of forced reconnection in two and three dimensions.
Magnetic reconnection -- Mathematical models. Plasma (Ionized gases). Magnetohydrodynamics -- Mathematical models. Scaling laws (Statistical physics). Forcing (Model theory).
This thesis presents two-fluid simulations of forced magnetic reconnection with finite electron inertia in two and three dimensional periodic systems. Reconnection in the system is driven by a spatially localized forcing function, added to the ion...
Dartmouth Dissertations

Dispersive field line resonances and small-scale electromagnetic auroral structures.
Ionosphere. Magnetosphere. Magnetohydrodynamic waves. Magnetohydrodynamics -- Mathematical models.
Dartmouth Dissertations

Modeling geomagnetic storms on prompt and diffusive time scales / By Zhao Li
The discovery of the Van Allen radiation belts in the 1958 was the first major discovery of the Space Age. There are two belts of energetic particles. The inner belt is very stable, but the outer belt is extremely variable, especially during...
Dartmouth Dissertations

Simulating electron radiation belt dynamics.
Van Allen radiation belts -- Mathematical models. ; Magnetosphere -- Mathematical models. ; Magnetohydrodynamics -- Mathematical models.
The physics of geomagnetically-trapped radiation has been a topic of interest since the discovery of the Van Allen belts in 1958. As the energetic particles comprising these belts can pose a hazard to human activity in space, considerable effort...
Dartmouth Dissertations

Interactions between tree species, soil, and nitrogen availability in fir-birch-spruce forests.
Plants -- Effect of nitrogen on. ; Nitrogen cycle. ; Forest ecology
Dartmouth Dissertations

A simulation study of beam driven instabilities and solitary structures in the auroral acceleration region.
Auroras. ; Plasma (Ionized gases) -- Simulation methods. ; Electron beams. ; Ion bombardment.
Dartmouth Dissertations

Effects of the active auroral ionosphere on magnetosphere-ionosphere coupling.
Ionospheric radio wave propagation -- Mathematical models. ; Ionosphere -- Mathematical models. ; Magnetosphere -- Mathematical models. ; Auroras -- Mathematical models. ; Magnetosphere-ionosphere coupling. ; nasat.
The thesis is devoted to the effects of electromagnetic coupling between the Earth's magnetosphere and the active auroral ionosphere. The research has been focused, in particular, on the concept of ionospheric feedback instability. The feedback...
Dartmouth Dissertations

Substorm-related VLF chorus events: local-time dependence and relationship to newly-injected clouds of drifting energetic electrons.
VLF emissions. ; Dawn chorus (Radio meteorology) Magnetospheric substorms.
Dartmouth Dissertations

The effect of ionospheric outflow on the dynamics of magnetospheric convection
The ionosphere is an important source of plasma in the magnetosphere, especially during geomagnetic storms. While satellite data has confirmed this population of ions, their effect on the dynamics of the magnetosphere-ionosphere (MI) system is not...
Dartmouth Dissertations

Examining auroral downward current region processes using ground based data.
Auroras -- Alaska -- Observations. Magnetospheric currents.
This thesis presents data from ground camera observations of the aurora conducted from Alaska during the winters of 2005 through 2007. In conjunction with these camera observations, conjugate radar observations of the auroral ionosphere were...
Dartmouth Dissertations

Ground and space observations of medium frequency auroral radio emissions / by Matthew C. Broughton.
The auroral zone is a rich source of natural radio emissions that can be observed in space and at ground-level. By studying these waves, scientists can gain insight into the plasma processes that generate them and use the near-Earth space...
Dartmouth Dissertations

Ground-based observations of auroral radio emissions.
Hiss (Radio meteorology). VLF emissions. Auroras.
Dartmouth Dissertations

Direct experimental investigation of the electron distribution function in a magnetized plasma.
Plasma dynamics. Electrons.
Dartmouth Dissertations

Self-consistent steady-state model of the low-lattitude boundary layer.
Magnetopause -- Mathematical models. Solar wind -- Mathematical models. Magnetosphere -- Mathematical models.
Dartmouth Dissertations

Asymptotic methods for nonlinear magnetospheric boundary waves.
Magnetohydrodynamics -- Mathematical models. ; Nonlinear waves -- Mathematical models. ; Asymptotic expansions.
Dartmouth Dissertations

Investigation of EMIC wave scattering as the cause for relativistic electron precipitation : a quantitative comparison of simulation with observations / by Zan Li
The fluxes of radiation belt electrons are highly variable, due to a competition between various acceleration, loss, and transport processes. Studies of any of the processes are equally important. My study focuses on electron-EMIC (electromagnetic...
Dartmouth Dissertations

Sounding-rocket studies of Langmuir-wave microphysics in the auroral ionosphere / by Micah P. Dombrowski
Since their discovery in laboratory plasmas in the 1920s, Langmuir waves have been observed to be ubiquitous in plasma environments, particularly in space plasmas. From the greater solar wind to planetary foreshocks and the auroral ionosphere,...
Dartmouth Dissertations

Whistler chorus waves : linear theory and nonlinear simulations in dipole geometry / by Shuo Wu
Whistler-mode chorus waves have recently drawn tremendous attention as an important mechanism for controlling the energetic electron flux in Earth’s radiation belt. This dissertation aims to answer questions about whistler-mode chorus waves, such...
Dartmouth Dissertations

Measuring the seeds of thermal ion outflow / by Philip A. Fernandes
The ionosphere is the primary source for heavy ions which are ubiquitous in the terrestrial magnetosphere. Low-altitude energization in the auroral ionosphere results in bulk heating and transverse acceleration of ions, which begin to upwell and/or...
Dartmouth Dissertations

New measurements of equatorial spread-F: high-altitude irregularities and drifting bubbles.
Plasma instabilities. ; Ionospheric electron density. ; Ionosphere.
As a result of an unstable plasma stratification the nighttime equatorial ionosphere is subject to a variety of plasma instabilities known commonly as equatorial spread-F. In its fully developed form spread-F consists of large wedges of depleted...
Dartmouth Dissertations

On the density of abundant numbers.
Number theory. ; Numbers Natural. ; Algorithms.
Dartmouth Dissertations

Radial diffusion of radiation belt electrons in three dimensions.
Van Allen radiation belts -- Mathematical models. Electrons -- Diffusion -- Mathematical models. Magnetohydrodynamic waves -- Mathematical models.
It is becoming increasingly important to understand the dynamics of radiation belt energetic particles given their potentially hazardous effects on satellites and our ever-increasing dependence on those satellites. There is a need to determine...
Dartmouth Dissertations

A study of magnetospheric pulsations.
Geomagnetic micropulsations. ; Magnetosphere. ; Cosmic magnetic fields -- Measurement.
A study of magnetospheric pulsations is presented in three parts. The first consists of a statistical survey using data from the AMPTE/IRM satellite. A number of conclusions are drawn from the study. Evidence is provided that supports the theory...
Dartmouth Dissertations

Solitary structure formation on auroral field lines.
Magnetohydrodynamic waves. ; Auroras -- Mathematical models.
Dartmouth Dissertations

Wave phenomena in the magnetosphere: auroral electromagnetic ion cyclotron waves and quasi-thermal electrostatic fluctuations.
Cyclotron waves. ; Plasma waves.
Dartmouth Dissertations

Sounding rocket based investigations of HF waves in the auroral ionosphere.
Ionospheric radio wave propagation -- Observations. ; Auroras -- Alaska -- Observations. ; Sounding rockets -- Observations.
Dartmouth Dissertations

Sounding rocket investigations of whistler, upper hybrid and Langmuir waves in the auroral ionosphere.
Auroras -- Alaska -- Observations. Ionospheric radio wave propagation -- Observations. Sounding rockets. Electromagnetic waves -- Observations. Whistlers (Radio meteorology) -- Alaska -- Observations.
In this thesis data from four sounding rocket experiments (PHAZE II, SIERRA, RACE and HIBAR) are used to explore the high and medium frequency waves seen in the auroral ionosphere. All rockets were launched into active aurora and carried both...
Dartmouth Dissertations

Observational study of dynamic structures at the magnetopause.
Magnetopause. ; Magnetopause -- Remote sensing. ; Magnetosphere -- Remote sensing. ; Magnetohydrodynamics -- Observations.
Dartmouth Dissertations

Modeling effects of magnetic field line curvature on transient proton belts.
Magnetosphere -- Mathematical models. ; Magnetic fields -- Mathematical models. ; Scattering (Physics) -- Mathematical models.
Lowest order charged particle motion in the Earth''s magnetosphere can be explained using simple adiabatic theory. However, nonadiabatic theory is required to explain particle behavior in cases such as when the particle's gyroradius is large...
Dartmouth Dissertations

In situ and laboratory measurements of cold plasmas.
Low temperature plasmas -- Measurement.
Measurement of the ionospheric thermal particle population bridges the two different communities of ground-based radar and space-based rocket studies, which have the common goal of characterizing heavy ion transport in the cusp/cleft region. We...
Dartmouth Dissertations

Numerical and observational study of plasmaspheric ULF cavity resonance.
Plasmasphere. ; Magnetosphere. ; Magnetohydrodynamics. ; Magnetic resonance.
Dartmouth Dissertations

Finite element simulation of two-dimensional incompressible magnetohydrodynamic flows.
Magnetohydrodynamics -- Simulation methods. ; Finite element method. ; Galerkin methods.
Dartmouth Dissertations

Structure of and dynamical processes in the earth's magnetopause and boundary layer regions.
Magnetopause. ; Boundary layer -- Models.
Dartmouth Dissertations

Fine structure in auroral radio emissions.
Ionospheric radio wave propagation -- Observations. Hiss (Radio meteorology). Auroras -- Antarctica -- Observations.
A VersatIle Electromagnetic Waveform (VIEW) receiver was deployed at South Pole station in December 2002 in order to measure the fine structure of auroral radio emissions with high resolution and an unprecedented 500-1000 kHz bandwidth. Using this...
Dartmouth Dissertations

A theoretical study of the magnetopause current layer.
Cosmic magnetic fields.
Dartmouth Dissertations

Structure, evolution, and boundary conditions for auroral downward current region potential drops.
Auroras -- Alaska -- Observations. Magnetospheric currents. Electric currents. Magnetic fields.
Auroral downward-current regions balance the upward currents of visible auroral arcs. FAST satellite data show conclusive evidence to confirm that these downward current regions (DCR) contain positive potential structures with diverging DC electric...
Dartmouth Dissertations

Reconstruction of two-dimensional coherent structures in space plasmas from spacecraft data.
Space plasmas. ; Magnetopause. ; Solar wind. ; Magnetic flux. ; Plasma astrophysics.
Two types of two-dimensional (2-D), coherent (time-stationary) space plasma structures, described by one-fluid, magnetostatic and isotropic plasma theory, are examined. One is the internal structure of the Earth's magnetopause and the other is...
Dartmouth Dissertations

Statistical analysis and empirical modeling of large- and small-scale plasma drifts in Earth''s high-latitude ionosphere.
Electric fields in the high-latitude regions of Earth's ionosphere are an important component of the coupled magnetosphere-ionosphere-thermosphere system. Characterizing the average behavior of these fields (or the corresponding drifts) is useful...
Dartmouth Dissertations

Hybrid code simulation of electromagnetic ion cyclotron waves in curvilinear coordinates.
Cyclotron waves -- Mathematical models. Curvilinear coordinates. Nonlinear theories
Dartmouth Dissertations

Ground based studies of auroral medium frequency burst radio emissions.
Ionospheric radio wave propagation. Auroras -- Alaska.
Dartmouth Dissertations

Dayside magnetic reconnection in global simulations of earth's magnetosphere.
Magnetosphere -- Mathematical models. Magnetic reconnection -- Mathematical models.
In this thesis we present the results of two studies of magnetic reconnection at the dayside magnetopause using the Lyon-Fedder-Mobarry magnetospheric simulation code. The first study examined the global properties of reconnection as a function of...
Dartmouth Dissertations

Electron precipitation models in global geospace simulations
The ability to forecast the weather of the geospace environment depends critically on the ability to accurately model the dynamics of the coupled magnetosphere-ionosphere (MI) system. The MI interaction involves a set of electrodynamic and plasma...
Dartmouth Dissertations

Four solar cycle ecliptic solar wind data set generated from the OMNI data set
Numerical modeling of the global heliosphere provides key insights into the physics of the outer heliosphere. The solar wind data utilized by these models impacts their accuracy and should be as close as possible to the actual solar wind. Ideally,...
Dartmouth Dissertations

In situ analysis of measurement of auroral dynamics and structure
Two auroral sounding rocket case studies, one in the dayside and one in the nightside, explore aspects of poleward boundary aurora. The nightside sounding rocket, Cascades-2 was launched on 20 March 2009 at 11:04:00 UT from the Poker Flat Research...
Dartmouth Dissertations

Precipitation and energization of relativistic radiation belt electrons induced by ULF oscillations in the magnetosphere / by Thiago V. Brito.
There is a renewed interest in the study of the radiation belts with the recent launch of the Van Allen Probes satellites. The mechanisms that drive the global response of the radiation belts to geomagnetic storms are not yet well understood....
Dartmouth Dissertations

A three-dimensional model for feedback unstable ULF waves at high latitudes / by Nan Jia.
Currently, the hypothesis that discrete auroral arcs are produced by fluxes of magnetospheric electrons accelerated along the ambient magnetic field into the ionosphere by linear/non-linear mechanisms associated with magnetic field-aligned currents...
Dartmouth Dissertations

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