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.
Results
Showing 1 to 20 of 26 for “"magnetopause"”.
-
Cusp Ion Structures and Their Relation to Magnetopause Processes
… and properties of reconnection at the Earth's magnetopause. However, observations are often difficult to interpret since spacecraft move relative to a cusp ion structure, creating temporal/spatial ambiguity in the observations. Models of cusp ion structures are also limited to the cases during …
-
Mapping of the Quasi-periodic Oscillations at the Flank Magnetopause into the Ionosphere
<p>We have estimated the ionospheric location, area, and travel time of quasi-periodic oscillations originating from the magnetospheric flanks. This was accomplished by utilizing global and local MHD models and Tsyganenko semi-empirical magnetic field model on multiple published and four new cases …
-
Identifying Signatures of Plasma Waves and Reconnection Associated with Kelvin-Helmholtz Activity
<p>The magnetopause marks the boundary between 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 …
-
Modeling Ganymede's Interaction with the Jovian Magnetosphere: Ionospheric Outflow and the Juno PJ34 Flyby
… “wake” region detected along the Jupiter-averted magnetopause. (b) Ganymede’s pick-up tail leaves a subtle, but clearly discernible imprint in the magnetic field downstream of the moon. (c) Heavy pick-up ions dominate ionospheric outflow and form a tail with steep outer boundaries. (d) During the …
-
An analytical relationship between the magnetospheric potential drop and the ionospheric conductance
… of a magnetic field draping around the tail magnetopause. Two methods are used: (1) matching currents through the tail magnetopause and the Earth's ionosphere in analogy with the Alfven wing at the Jovian satellite Io, (2) minimizing the total power that the solar wind loses to the Earth's …
-
MMS Observations of the Kelvin-Helmholtz Instability and Associated Ion Scale Waves
… to heating and/or plasma transport across the magnetopause boundary.</p> <p>The launch of the Magnetosphere Multiscale (MMS) mission in 2015 offered a new opportunity to study secondary processes associated with the KHI down to the electron scale. The MMS mission's goal was to study the …
-
Solar wind-magnetosphere interactions : a statistical analysis of spacecraft measurements
… help improve the specification of the IMF at the magnetopause.
-
Nonlinear Evolution of Mirror Instability in the Earth's Magnetosheath in PIC Simulations
… bow shock and they are convected toward the magnetopause. In the middle magnetosheath, where plasma is mirror unstable, mirror structures are dominated by magnetic peaks. Close to the magnetopause, plasma expansion makes the region mirror stable and magnetic peaks evolve to magnetic holes. We …
-
A Method to Compute Three Dimensional Magnetospheric Equilibria with Dipole Tilt and its Application in Estimating Magnetic Flux Tube Volume
… locate the neutral sheet, and identify the magnetopause In addition, we present a generalized theory for calculating magnetic flux tube volume in the magnetotail, in an attempt to generalize the Wolf [2006] empirical formula, and describe a method for estimating flux tube volume from …
-
Modeling the formation of current sheets in symmetric and asymmetric reconnection
… important to reconnection in Earth's dayside magnetopause. We develop an analytic model for the evolution of the electron phase space distribution function based on adiabatic invariants. We then apply this two model problems-Fermi acceleration and electron trapping-to extend previous results …
-
"Smoking-Gun" Observables of Magnetic Reconnection: Spatiotemporal Evolution of Electron Characteristics Throughout the Diffusion Region
… Multiscale (MMS) mission caught an EDR at the magnetopause and confirmed the signature crescent electron populations. A virtual spacecraft trajectory through the PIC domain is determined quantitatively by inputting MMS magnetic field measurements into an algorithm that outputs a trajectory …
-
Quantitative modeling of time-dependent phenomena in the magnetospheric magnetic field
… distribution over the tail portion of the magnetopause. The enhanced flexibilities of the interconnection field and cross-tail current module make possible the modeling of variations in the interplanetary magnetic field (IMF) as it propagates downstream, thereby advancing the steady-state …
-
Ionospheric Convection and Auroral Responses to Solar Wind Driving
… southward, reconnection on the dayside magnetopause opens magnetic flux, which eventually reconnects in the magnetotail. When dayside reconnection is dominant, the polar cap, the area where open magnetic flux meets the Earth's surface, increases. Similarly, when nightside reconnection is …
-
Solar Wind-Magnetosphere Coupling: A Global Perspective of Reconnection in the Magnetotail
… the bow shock, or a flux-transfer event at the magnetopause and, further, that this strong southward component of Bz in the magnetosheath is associated with the trigger of the observed substorm. We simulate the entire magnetosphere in maximum detail for this event using the Space Weather …
-
High-latitude coupling processes between thermospheric circulation and solar wind driven magnetospheric currents and plasma convection
… the MIT system via reconnection processes at the magnetopause. The Field Aligned Currents (FACs) constitute the energetic links between the magnetosphere and the Earth ionosphere. The MIT system depends on the highly variable solar wind conditions, in particular on changes of the strength and …
-
Effect of Interplanetary Shock Impact Angle on the Occurrence Rate and Properties of Pc5 Waves Observed by High-Latitude Ground Magnetometers
… (CIRs). They have the ability to move the magnetopause, the boundary between the Earth's magnetosphere and 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 …
-
MODELING OF PLASMA-SHEET CONVECTION: IMPLICATIONS FOR SUBSTORMS (MAGNETOSPHERE)
… occurs generally, independent of the specific magnetopause or far-tail boundary conditions. These results suggest that the magnetospheric substorm is the inevitable outcome of Earthward plasma-sheet convection, in order to release plasma from inner-plasma-sheet flux tubes and the magnetic …
-
Driving Influences of Ionospheric Electrodynamics at Mid- and High-Latitudes
… one poleward of the cusp and the other at the magnetopause nose, to explain the observed flow behavior. In Chapters 3 and 4, we investigated the driving influences of nightside subauroral convection. We developed new statistical models of nightside subauroral (52 - 60 degree) convection under …
-
Earth's outer electron radiation belt : sources, losses and predictions
… flux dropouts at GEO. This leads to enhanced magnetopause losses and subsequent outwards radial diffusion. Other loss processes may also play a role. In the second body of research (Chapter 5), the partial moments (electron number density, temperature and energy density) from GOES-13 are …
Page 1 of 2