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 33 for “"Earth's Magnetic Field"”.
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The Earth's Magnetic Field
The Earth's magnetic field is essential for life on Earth, as we know it, to exist. It forms a magnetic shield around the planet, protecting it from high energy particles and radiation from the Sun, which can cause damage to life, power systems, orbiting satellites, astronauts and spacecrafts. This …
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Detection of rapid fluctuations in the earth's magnetic field.
Thesis: B.S., Massachusetts Institute of Technology, Department of Physics, 1973
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Direction and intensity of Earth's magnetic field at the Permo-Triassic boundary
The Earth's magnetic field is generated by the motion of liquid iron-rich material in the outer core. One of the most drastic manifestations of the dynamics in the outer core are polarity reversals of the magnetic field. The processes controlling geomagnetic reversals, however, are still poorly …
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An analysis of the variation of the earth's magnetic field in the frequency range 1 to 12 cycles per day
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Geology and Geophysics, 1962.
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Electromagnetic formation flight dipole solution planning
Electromagnetic Formation Flight (EMFF) describes the concept of using electromagnets (coupled with reaction wheels) to provide all of the necessary forces and torques needed to maintain a satellite's relative position and attitude in a formation of satellites. With EMFF, this formation can be …
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Orientation in migratory birds: orientation mechanisms and their underlying neurobiological background
… and physiological mechanisms underlying the magnetic compass orientation of night-migratory birds. Behavioural observation show that night-migratory garden warblers (Sylvia borin) use stereotype sideways movement of the head (head scans) to detect the reference direction provided by the …
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The feasibility of the use of Overhauser effect in a nuclear free precession magnetometer.
… used to measure the magnitude of the Earth's magnetic field, operate on the relationship that exists between the magnitude of the environmental magnetic field and the frequency of precession of the hydrogen nuclei placed in this field. One of the serious problems that is encountered in …
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Magnetic Signature Estimation Using Neural Networks
Ferrous objects in earth's magnetic field cause distortion in the surrounding ambient field. This distortion is a function of the object's material properties and geometry, and is known as the magnetic signature. As a precursor to first principle modeling of the phenomenon and a proof of concept, …
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Analyzing Microwave Spectra Collected by the Solar Radio Burst Locator
… heavily upon microwave, radio, and other electromagnetic frequency bands as a means of providing wireless communication links. Although convenient, wireless communication is susceptible to electromagnetic interference. Solar activity causes both direct interference through electromagnetic …
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Intense spreading of radar echoes from ionospheric plasmas
… at an angle of approximately 70 degrees to the Earth's magnetic field, a favorable condition for the excitation of the Rayleigh-Taylor instability over Arecibo.
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Electron transport, acceleration and loss in Earth's outer radiation belt
Earth's radiation belts are comprised of high energy charged particles trapped by Earth's magnetic field. The outer radiation belt is highly variable, with the trapped electron flux varying by orders of magnitude on timescales of hours. The radiation belts are a hazard for satellite operations as …
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Wavelet analysis of geomagnetic jerks
Geomagnetic jerks, or secular variation impulses, are abrupt changes in the slope of the first time derivative of the Earth's magnetic field. These changes occur on time scales of the order of a year. It has been demonstrated that the jerks might be more singular than previously supposed; their …
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Modelling the induced magnetic signature of naval vessels
… design feature. With recent advances in electromagnetic sensor technology the war time threat to shipping posed by electromagnetically triggered mines is becoming more significant and consequently the need to understand, predict and reduce the electromagnetic signature of ships is growing. There …
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Recent lunar magnetism
… (<1.5 Ga) is a mystery because common sources of magnetic fields (e.g. core dynamo and long-lived impact plasma fields) have not been present within the last 1.5 Ga. To better characterize the source of magnetization in young lunar samples, we conducted paleomagnetic measurements on several …
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A wireless sensor network for smart roadbeds and intelligent transportation systems
… vehicles by detecting the perturbations in the Earth's magnetic field caused by the vehicles. They measure this perturbation using an anisotropic magneto-resistive magnetic field sensor. The radio transmitters in the sensor are frequency-agile, and the sensors use a randomized sparse TDMA …
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Radiation of VLF/ELF waves from a magnetospheric tether
… into their loss cone, thus reentering the Earth. The aim of this thesis is to develop an analytical model of propagation and radiation of Electromagnetic Ion Cyclotron Waves (EMIC) from a high-voltage magnetospheric tether, which are the waves proposed to scatter protons. The plasma is …
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Kinetic modeling of electrodynamic space tethers
… orbit boosting and de-orbiting of Low Earth Orbit (LEO) satellites. On the one hand, when driven by a current, their interaction with the Earth's magnetic field creates a thrusting Lorentz force. On the other hand, current can be collected from the ionospheric electrons, which also …
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Artificial Intelligence-Assisted Inertial Geomagnetic Passive Navigation
… Particle Filter for enhancing geomagnetic navigation in airborne simulated missions.</p> <p>A simulation framework is developed to facilitate the evaluation of the proposed navigation system. This framework includes a detailed aircraft model, a mathematical representation of the …
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Dynamics and control of electromagnetic satellite formations
… required for formation reconfiguration. Electromagnetic Formation Flying (EMFF) is a novel concept that uses superconducting electromagnetic coils to provide forces and torques between different satellites in a formation which enables the control of all the relative degrees of freedom. With …
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Experimental studies of magnetic reconnection in 3D geometries
Magnetic reconnection is an important and prevalent plasma physics phenomenon occurring in astrophysical (solar flares), space (magnetospheric substorms), and laboratory settings (tokamak sawtooth oscillations). It allows for a change in the magnetic field topology in plasmas while also …
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