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Showing 1 to 20 of 22 for “"Magnetic field measurements"”.
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Mathematic approaches for the calibration of the CHAMP satellite magnetic field measurements
… satellite mission to study the earth's gravity field, magnetic field and upper atmosphere. Thanks to the good condition of the satellite so far, the planned 5 years mission is extended to year 2009. The satellite provides continuously a large quantity of measurement data for the purpose of Earth …
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Multipoint measurements of field aligned current density in the auroral zone
… main payload during the flight and multipoint magnetic field measurements were made.</p><p>Magnetic field data reduction was performed on data obtained from the FFMs. The data reduction procedure is very complicated in the sense that it requires transformation from a spinning and precessing …
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Probe studies of plasma in a magnetic well
… proposed by Andreoletti has been investigated. Magnetic field measurements have revealed that the device produces a magnetic well with mirror ratio 1.06. Further magnetic probe measurements have enabled detailed description of the plasma dynamics in the central horizontal plane to be given. A …
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RTD FLUXGATE MAGNETOMETERS
… as practical and convenient sensors for vector magnetic field measurements in the range of microtesla requiring a resolution of hundreds of picotesla at room temperature, and they find applicability in fields such as space, geophysical exploration and mapping, non destructive testing, as well as …
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Advanced Aeromagnetic Compensation Models for Airborne Magnetic Anomaly Navigation
Using the earth's magnetic anomaly field for navigation of aircraft has shown promise as a viable alternative to the Global Positioning System (GPS) and other navigation systems. An airborne magnetic anomaly navigation (MagNav) system collects real-time magnetic field data and uses predetermined …
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Photonic Crystal Lorentz Force Magnetometer for Out-of-Plane Magnetic Field Sensing
… photonic crystal directional coupler (PCDC) for magnetic field sensing perpendicular (out-of-plane) to the chip surface. Built on the Silicon-On-Insulator platform, a custom post-processing recipe was developed to fabricate the electrically controlled optomechanical device at the micron scale. A …
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Contactless voltage and current estimation using signal processing and machine learning
… estimates are derived from an array of point magnetic-field measurements processed by a linear least-square-error estimator. The gains in the estimator are chosen using a probabilistic model of measurement errors created by external magnetic field sources. Test bed validation of the estimates …
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Realization of TMR devices in an industrial environment
… are widely used in sensor applications for magnetic field measurements. Currently these sensors mostly use the Anisotropic Magnetoresistive Effect (AMR) or the Giant Magnetoresistive Effect (GMR). Due to their unique properties sensors based on the TMR effect could be advantageous: They …
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Thermal conductivity of superconducting niobium
The magnetic field and temperature dependence of the thermal conductivity of superconducting niobium have been measured in magnetic fields which ranged .. from zero to above the critical fields, and for temperatures which ranged from 0.31 K to above the transition temperature. Measurements were …
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A scale-free analysis of magnetic holes in the solar wind
Magnetic holes are isolated intervals of depleted interplanetary magnetic field (IMF) strength on timescales of several seconds to several hours. These intervals have been seen as often as several times per day in the ecliptic and at high heliospheric latitudes from 1 AU to 5.4 AU. We present a …
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A Mossbauer study of divalent iron in silver chloride crystals
… rise to random fluctuations in the electric field gradient at the iron nucleus (quadrupole relaxation). Using a suitable model to describe the Mossbauer line shape in the presence of fluctuating hyperfine fields we have measured the activation energy for a vacancy jump and obtained, E = (0.07 …
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Investigation of magnetic sensing system for in-place corrosion characterization in metals
… This document describes the development of magnetic sensing schemes to characterize corrosion of metals in situ. GMR magnetic field sensors are applied to overcome difficulties encountered with traditional corrosion detection methods. Magnetic measurements present a manner to monitor …
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"Smoking-Gun" Observables of Magnetic Reconnection: Spatiotemporal Evolution of Electron Characteristics Throughout the Diffusion Region
<p>How does magnetic reconnection happen in a collisionless plasma? Knowledge of electron-scale dynamics is necessary to answer this outstanding question of plasma physics. Based on fully kinetic particle-in-cell (PIC) simulations of symmetric reconnection, the spatiotemporal evolution of velocity …
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New features in the phase diagrams of the cuprate high-Tc superconductors mapped using strong magnetic fields
… the cuprate high-Tc superconductors using high magnetic field electrical transport measurements. These discoveries attempt to address two central questions pertaining to how the physics of the cuprate high-Tc superconductors evolve as a function of both temperature and hole-doping. The first …
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A magnetic levitation testbed for development of real-time control frameworks applied in fusion
This thesis presents the development of a magnetic levitation device as a hardware-in-theloop platform to be used for research in Control and Data Acquisition frameworks applied to fusion experiments. Specifically, the testbed is aimed to demonstrate distributed, modular control using a plasma …
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Spectroscopic Measurements of Magnetic Field and Electron Density on Wire Array and Laser Plasmas
Magnetic field and electron density distributions within plasmas are crucial parameters in the study of high energy density laboratory plasmas. These measurements are challenging because often the magnetic fields undergo significant spatial and temporal fluctuations. Of the few measurement …
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Interstellar helium pickup ion flux variations observed with SOHO/CELIAS
… transported outward with the solar wind (SW). Measurements of these particles give information about the local interstellar gas in which our sun resides. However, fluxes of pickup ions in the solar wind are observed to vary substantially in both magnitude and energy spectrum.</p><p>Hypothesized …
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Auroral electrodynamics from simultaneous measurements at high and low altitudes
… simultaneously at high and low altitudes along a field line by the Dynamics Explorer (DE) spacecraft have been used to study auroral electrodynamics. Electric fields plotted as a function of invariant latitude show that the large-scale features are essentially the same at high and low altitudes …
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High resolution studies of complex solar active regions
… events are produced in sunspots with a complex magnetic field topology. Studying their morphology and dynamics is helpful in understanding the energy accumulation and release mechanisms for flares and CMEs, which are intriguing problems in solar physics. The study of complex active regions is …
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Physics of the helicon antenna on the prototype materials exposure experiment
… kW of power. Establishing plasma densities and magnetic field strengths under the antenna that suppress non-resonant mode conversion to the slow-wave are thought to be responsible for operating in the ""helicon-mode"". Evidence for this phenomena to be responsible for the ""helicon-mode"" of …
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