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 9 of 9 for “"electrojet"”.
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Structure of the polar electrojet antenna
… lead to perturbations to the natural flow of electrojet current in the lower ionosphere, resulting in ELF/VLF radiation at the modulation frequency. Measurements of the radiation, along with analytic and numerical models, suggest that a vertical loop with a scale size of 10 km is the dominant …
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Simultaneous observations of meteors and the equatorial electrojet at Jicamarca
… meteor trails deposited within the equatorial electrojet. It is suggested that trails at electrojet heights must carry intense transient currents that excite two-stream and/or gradient drift instabilities for irregularity growth. The direction of electron motion responsible for the transient …
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Plasma turbulence in the equatorial electrojet observations, theories, models, and simulations
The plasma turbulence in the equatorial electrojet due to the presence of two different plasma instability mechanisms has been observed and studied for more than seven decades. The sharp density-gradient and large conductivity give rise to gradient-drift and Farley-Buneman instabilities, …
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Long-term investigation of the lunar tide in the equatorial electrojet during stratospheric sudden warmings
… intense E-region current known as the equatorial electrojet (EEJ) flows above the dip equator during the daytime. The day-to-day variability of the EEJ can be determined from magnetic field records at geomagnetic observatories close to the dip equator. Such magnetic data are available for several …
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Magnetic perturbations due to current structural variations
… two basic solutions, one in which a horizontal electrojet connects two filamentary Birkeland currents, and the other in which broad Birkeland sheet currents (Fig. 2) flow to the edges of the arc, with a transverse closing current and a Hall electrojet. In this thesis, we adopted a model similar …
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Data Driven Prediction Without a Model
… at two stages. In the first stage, the auroral electrojet indices, computed from the magnetometer data, are used to reconstruct the dynamics and Nearest Neighbor ETKF yields forecasts of the index that are more skillful than persistence. In the second stage, the multivariate time series from …
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Solar flare effects observed over Jicamarca during MST-ISR experiments
… due to D-region absorption. Also, the equatorial electrojet (EEJ) radar backscatter was suppressed. Radar echoes from 150 km region were observed throughout the events but showed an abrupt initial drop in altitude by about 10 to 20 km followed by a slow recovery of 1 to 2 hours. Finally, in the …
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Formation of small-scale irregularities in the auroral E region
… of the HF radio waves onto various parts of the electrojet layer) and the plasma physics of irregularity formation (effects of strong gradients of the background electron density, ion and neutral particle motions, mode coupling, anomalous collisions). It is argued that the high-velocity HF echoes …
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Direct-Write Electrospinning of Highly-Loaded Ceramic Slurries for Additive Manufacture
Ceramics are desirable materials for a range of mechanical, electrical and biomedical applications, but they can be difficult to form and process. Additive manufacture is increasingly being explored for producing ceramic parts without moulds. In this work, a method for controllably patterning …