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Author: Arthur D. Richmond Publisher: ISBN: Category : Equations of motion Languages : en Pages : 72
Book Description
A computer program which calculates electron and ion densities, ionospheric conductivities, electric fields and currents, and magnetic variations in regions near the magnetic equator is described in detail. It is also explained how this numerical model can be used to deduce F-region vertical plasma drifts in the equatorial ionosphere from observed magnetic variations at ground level. (Author).
Author: Arthur D. Richmond Publisher: ISBN: Category : Equations of motion Languages : en Pages : 72
Book Description
A computer program which calculates electron and ion densities, ionospheric conductivities, electric fields and currents, and magnetic variations in regions near the magnetic equator is described in detail. It is also explained how this numerical model can be used to deduce F-region vertical plasma drifts in the equatorial ionosphere from observed magnetic variations at ground level. (Author).
Author: Arthur D. Richmond Publisher: ISBN: Category : Equations of motion Languages : en Pages : 0
Book Description
A computer program which calculates electron and ion densities, ionospheric conductivities, electric fields and currents, and magnetic variations in regions near the magnetic equator is described in detail. It is also explained how this numerical model can be used to deduce F-region vertical plasma drifts in the equatorial ionosphere from observed magnetic variations at ground level. (Author)
Author: CAgodi Onwumechikli Publisher: Routledge ISBN: 1351449931 Category : Science Languages : en Pages : 650
Book Description
This is the first book to review all the fields of equatorial electrojet phenomena and their relevant theories in one volume. In certain relevant sections, the book discusses both the equatorial electrojet and the world-wide parts of the Sq current systems. Onwumwchili is an internationally known and highly respected expert in the equatorial electrojet field- a brand of geomagnetism.
Author: Esayas Belay Shume Publisher: ISBN: Category : Languages : en Pages : 436
Book Description
This dissertation describes a theoretical, experimental, and modeling investigation of the equatorial electrojet. We review low latitude ionospheric current models, synthesizing developments from the early times until the present. We then show how to utilize equatorial electrojet irregularities to infer E region electron density and wind profiles from coherent scatter radar experiments. The procedure involves a numerical model of the equatorial ionosphere that relates the vector electric field and current density to the winds. We present electron densities inferred in the equatorial electrojet inferred using a new bistatic radar system installed between Paracas and Jicamarca, Peru. The radar system monitors density profiles using a coherent scatter radar technique that utilizes the Faraday rotation of the scattered signal. Radar measured density profiles are validated by comparing with other electron density measures. A three dimensional electrostatic potential model of the equatorial ionosphere in a magnetic dipole coordinate system is described. The model incorporates realistic ionospheric conductivities, electric fields, winds, and includes anamalous collision effects. The model utilizes bistatic radar measured densities, coherent scatter spectral measurements made at large zenith angles, and electric fields derived from 150 km echo drifts. The model is also constrained by magnetometer records. We next present a technique for extracting zonal winds in the equatorial electrojet from the Doppler shifts of type II radar echoes measured by a narrow beam, obliquely oriented antenna at the Jicamarca Radio Observatory. The wind profiles were retrieved by combining the 3-D model with theory and measurements of type II echo Doppler shifts. The amplitude and phasing of the calculated wind profiles are in general agreement with satellite and rocket-borne wind measurements. We have used height varying type I radar echoes and large-scale electrojet irregularities inferred from interferometric imaging to validate wind profiles estimates derived from type II echoes. (Abstract).
Author: M. J. Keskinen Publisher: ISBN: Category : Languages : en Pages : 21
Book Description
A brief review of recent computational studies of the E-region equatorial electrojet is presented. Agreement and discrepancies between numerical simulation studies and both theory and experiment are given. Some outstanding problems are identified and new experiments suggested.
Author: Hermann Lühr Publisher: Springer ISBN: 3319642928 Category : Science Languages : en Pages : 428
Book Description
This book addresses and reviews many of the still little understood questions related to the processes underlying planetary magnetic fields and their interaction with the solar wind. With focus on research carried out within the German Priority Program ”PlanetMag”, it also provides an overview of the most recent research in the field. Magnetic fields play an important role in making a planet habitable by protecting the environment from the solar wind. Without the geomagnetic field, for example, life on Earth as we know it would not be possible. And results from recent space missions to Mars and Venus strongly indicate that planetary magnetic fields play a vital role in preventing atmospheric erosion by the solar wind. However, very little is known about the underlying interaction between the solar wind and a planet’s magnetic field. The book takes a synergistic interdisciplinary approach that combines newly developed tools for data acquisition and analysis, computer simulations of planetary interiors and dynamos, models of solar wind interaction, measurement of ancient terrestrial rocks and meteorites, and laboratory investigations.
Author: B. E. McDonald Publisher: ISBN: Category : Languages : en Pages : 27
Book Description
A computer simulation based on fluid equations of motion seems to account for basic observational features of short wavelength type 2 (subsonically propagating) ionization irregularities in the equatorial electrojet. The short wavelengths (less than 28 meters for parameters taken here) are excited only after long wavelengths, horizontally propagating waves grow to an amplitude sufficient to trigger the nonlinear growth of secondary vertically propagating modes. The result is a complicated two dimensional turbulent flow, with convective elements moving with comparable vertical and horizontal velocities. The density fluctuation power spectrum obeys approximately a power law k to the minus 3.5 power. These results agree with theory and observation.
Author: Arthur D. Richmond
Author: Arthur D. Richmond
Author: Arthur D. Richmond
Author: CAgodi Onwumechikli
Author: Esayas Belay Shume
Author: M. J. Keskinen
Author: Hermann Lühr
Author: Air Force Cambridge Research Laboratories (U.S.)
Author: George J. Gassmann
Author: 
Author: B. E. McDonald