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 64 for “"GEOMAGNETIC FIELD"”.
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An analysis of IQSY meteor wind and geomagnetic field data,
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Meteorology, 1970.
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Investigations of temporal changes in climate and the geomagnetic field via high-resolution radiocarbon dating
… In addition to changes in solar activity, geomagnetic field records also show prominent variations around 3000-2000 cal BP. In order to investigate the temporal development of past changes in climate and the geomagnetic field it is crucial to establish accurate and precise chronologies for …
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Assessing Holocene and late Pleistocene geomagnetic dipole field variability
… artefacts are required to reconstruct geomagnetic field changes beyond the range of historical observations. In this thesis I assess the reliability of sedimentary palaeomagnetic data and Holocene dipole field reconstructions. New palaeomagnetic records are presented from a maar crater …
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Developing Archaeomagnetic Dating for Neolithic Scotland
Studying the past geomagnetic field preserved in fired archaeological features such as hearths, furnaces, or kilns, allows dating of their last use and provides crucial information about the behaviour of the geodynamo. This thesis plays a vital role in expanding and developing the application of …
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The Influence of Geomagnetism on the Maze Behavior of Dugesia Tigrina
… to learn is affected by orientation in the geomagnetic field.
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Excitation of forced ion acoustic waves, large plasma sheets, and magnetic field fluctuations over Gakona, Alaska
… excitation of plasma density fluctuations and geomagnetic field fluctuations" are reported in my M.S. thesis. The data was acquired in our experiments conducted at Gakona, Alaska from summer 2007 to winter 2008, using DoD/NSF-funded HAARP facilities and our own optical (ASIS) and radio …
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A magnetometer based payload for a PTOL UAV with application in geophysical surveys
… to studying the Earth has given rise to the field of geophysics, which has been recognised as a separate discipline since the 19th century. The practical implementation of this field has led to a separate branch, aptly named exploration geophysics. Exploration geophysics aims to measure …
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The Mouse Magnetic Compass
All five classes of vertebrates use the geomagnetic field for spatial orientation. The geomagnetic field can be used to derive both 'map' and 'compass' information. There is evidence for two different mechanisms used to sense the magnetic field, the radical pair mechanism (RPM) and the magnetite …
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Plasma flow in the magnetosphere under the influence of large scale electric field
… a mathematical model, using the most appropriate geomagnetic field model and adopting the idea of equivalent potential in the magnetosphere The field model consists of four components: 1) Dipole main field; 2) Dayside magnetosphere boundary current; 3) Quiet day ring current; and 4) Infinite …
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Paleomagnetic and AMS results from Oligocene ash-flow tuffs of the eastern San Juan Mountains : implications for the evolution of the western margin of the San Luis Basin, northern Rio Grande Rift
… tuffs are generally excellent recorders of the geomagnetic field and can be used to study the vertical-axis rotation component of extension related to the opening of the SLB. Four ash-flow tuffs (Carpenter Ridge, Fish Canyon, Chiquito Peak and Saguache Creek Tuffs) that were erupted between ca. …
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Effects of low intensity magnetic fields on cabbage loopers
Possible effects of steady low strength magnetic fields on insects were studied using the cabbage looper moth, Trichoplusia ni (Hubner). In the first tests, adult loopers were used to determine their locational preference in response to areas of stronger or weaker magnetic field ranging from …
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Radar observations of field-aligned plasma propagations associated with NASA's PMG experiment
… over great distances along the earth's geomagnetic field lines. VHF radars in Hilo, Hawaii and Jicamarca, Peru recorded observations of these field-aligned disturbances as part of the experiment. Based on analysis of these radar observations and tracking data of PMG's orbit, the …
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Studies of aspect angle dependence of plasma turbulence at HAARP
… control and suppression of artificial field-aligned irregularities (AFAI). This allows the isolation of ponderomotive plasma turbulence effects. Plasma line spectra exhibit a marked dependence on the aspect angle of the HF pump beam and the pointing of the MUIR diagnostic radar. …
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Tsunami monitoring using airglow imaging systems
… assumed posture of tsunami-induced IGWs in the geomagnetic field and the observation geometry is shown to predict the region of the sky in which the observations were seen.
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Magnetoelectric (ME) composites and functional devices based on ME effect
… Inspired by the bio-behaviors in nature, the geomagnetic sensor is designed for sensing geomagnetic fields; it is also potentially used for positioning systems based on the geomagnetic field. In this section, some works for DC sensor optimization have been performed, including the different …
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