Geomagnetic and Ionospheric Effects of Magnetospheric Motions PDF Download
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Author: Hermann Poeverlein
Publisher:
ISBN:
Category : Geomagnetism
Languages : en
Pages : 20
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Book Description
Author: Hermann Poeverlein
Publisher:
ISBN:
Category : Geomagnetism
Languages : en
Pages : 20
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Book Description
Author: David Southwood
Publisher: Springer
ISBN: 3319183591
Category : Science
Languages : en
Pages : 279
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Book Description
This book makes good background reading for much of modern magnetospheric physics. Its origin was a Festspiel for Professor Jim Dungey, former professor in the Physics Department at Imperial College on the occasion of his 90th birthday, 30 January 2013. Remarkably, although he retired 30 years ago, his pioneering and, often, maverick work in the 50’s through to the 70’s on solar terrestrial physics is probably more widely appreciated today than when he retired. Dungey was a theoretical plasma physicist. The book covers how his reconnection model of the magnetosphere evolved to become the standard model of solar-terrestrial coupling. Dungey’s open magnetosphere model now underpins a holistic picture explaining not only the magnetic and plasma structure of the magnetosphere, but also its dynamics which can be monitored in real time. The book also shows how modern day simulation of solar terrestrial coupling can reproduce the real time evolution of the solar terrestrial system in ways undreamt of in 1961 when Dungey’s epoch-making paper was published. Further contributions on current Earth magnetosphere research and space plasma physics included in this book show how Dungey’s basic ideas have remained explanative 50 years on. But the Festspiel also introduced some advances that possibly Dungey had not foreseen. One of the contributions presented in this book is on the variety of magnetospheres of the solar system which have been seen directly during the space age, discussing the variations in spatial scale and reconnection time scale and comparing them in respect of Earth, Mercury, the giant planets as well as Ganymede.
Author: Erwin O. Flückiger
Publisher:
ISBN:
Category : Cosmic rays
Languages : en
Pages : 40
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Book Description
Up to now, most studies were carried out assuming azimuthally symmetric currents, neglecting the well established longitudinal asymmetry in the geomagnetic disturbance at low- and mid-latitudes during magnetic storms. The asymmetric perturbations superposed upon a symmetric field depression has been attributed by several authors to a a longitudinally limited, partial ring current with field aligned closure through the auroral ionosphere (Cummings; Fukushima and Kamide; and references therein). It has been the objective of the research covered by this report to study the effects of such magnetospheric current systems on the propagation of cosmic ray particles through the domain of the earth's magnetosphere. The corresponding results were expected to demonstrate the significance of cosmic ray measurements as an additional tool for magnetospheric studies, especially in modeling the disturbed magnetic field in the magnetosphere. In this report, first the approach to the problem is reviewed in Section 2, and examples of the basic tools needed in the procedure are illustrated in Section 3. Then, in Section 4, the results of a simple study correlating local perturbations in the geomagnetic field with cosmic ray cutoff rigidity variations are discussed. Section 5 contains a summary of a detailed quantitative analysis on the effects of a partial ring current and of field-aligned currents on both cutoff rigidities and asymptotic directions in different latitude regions. In conclusions, the significance of the results obtained in the entire study is discussed in Section 6 for both magnetospheric and cosmic ray research.
Author: E.R. Dyer
Publisher: Springer Science & Business Media
ISBN: 9401031304
Category : Science
Languages : en
Pages : 322
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Author: Vania K. Jordanova
Publisher: Elsevier
ISBN: 0128155728
Category : Science
Languages : en
Pages : 334
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Book Description
Ring Current Investigations offers a comprehensive description of ring current dynamics in the Earth’s magnetosphere as part of the coupled magnetosphere-ionosphere system. In order to help researchers develop a deeper understanding of the fundamental physics of geomagnetic storms, it includes a detailed description of energetic charged particles injection, trapping, and loss. It reviews historical and recent advances in observations, measurements, theory and simulations of the inner magnetosphere and its coupling to the ionosphere and other surrounding plasma populations. In addition, it compares the physics of ring currents at other strongly magnetized planets in the solar system, specifically Jupiter, Saturn, Uranus and Neptune, with the ring current system at Earth. Providing a description of the most important space weather effects driven by inner magnetospheric energetic particles during geomagnetic storms and present capabilities for their nowcast and forecast, Ring Current Investigations is an important reference for researchers in geophysics and space science, especially related to plasma physics, the ionosphere and magnetosphere, solar-terrestrial relations, and spacecraft anomalies. Includes an appendix with links to downloadable video clips, illustrating features of ring current and geomagnetic storm dynamics Provides overview of existing state-of-the-art numerical models and links for open-source code downloads Offers guidance on how to develop numerical models within the context of the present-day understanding
Author: Ronald N. DeWitt
Publisher:
ISBN:
Category : Cosmic physics
Languages : en
Pages : 272
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Author: Mioara Mandea
Publisher: Cambridge University Press
ISBN: 1108418481
Category : Science
Languages : en
Pages : 347
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Book Description
An interdisciplinary review of research in geomagnetism, aeronomy and space weather, written by eminent researchers from these fields.
Author: Gunnar Skovli
Publisher:
ISBN:
Category : Geomagnetism
Languages : en
Pages : 368
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Book Description
Author: Paul M. Kintner, Jr.
Publisher: John Wiley & Sons
ISBN: 1118671716
Category : Science
Languages : en
Pages : 762
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Book Description
Published by the American Geophysical Union as part of the Geophysical Monograph Series, Volume 181. Filling the need for a 20-year lag in substantial consideration of the midlatitude ionosphere, this volume focuses on work that takes advantage of GPS and UV imaging from satellites over the past decade, two methods that have profoundly transformed our understanding of this stratum of the atmosphere. Its interdisciplinary content brings together researchers of the solar wind, magnetosphere, ionosphere, thermosphere, polar and equatorial ionospheres, and space weather. Modeling and assimilative imaging of the ionosphere and thermosphere show for the first time the complex and global impact of midlatitude ionospheric storms. The editors invited the leading experts in the following areas to contribute the chapters herein: Characterization of Midlatitude Storms Electric Field Coupling From the Heliosphere and Inner Magnetosphere Thermospheric Control of the Midlatitude Ionosphere Ionospheric Irregularities Experimental Methods and New Techniques These themes were chosen to create a path for understanding the midlatitude ionosphere. They continue to be largely valid and represent a coherent division of the subject matter. They will be critical for understanding space weather during the upcoming solar maximum. This book was inspired by the Chapman Conference of the same name held January 2007.
Author: Oliver J. Brambles
Publisher:
ISBN:
Category :
Languages : en
Pages : 354
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Book Description
The ionosphere is an important source of plasma in the magnetosphere, especially during geomagnetic storms. While satellite data has confirmed this population of ions, their effect on the dynamics of the magnetosphere-ionosphere (MI) system is not well understood. Global simulations play an important role in the understanding of geospace and allow the response of the MI system to ionospheric ions to be systematically investigated. This thesis focuses on the effect of ionospheric outflow on the strength and mode of magnetospheric convection. Models for transversely accelerated O+ outflow are implemented into a multifluid adaptation of the Lyon-Fedder-Mobarry (LFM) global simulation using empirical relationships which relate downward electromagnetic and particle power to an upwards flux of O+ ions. The effect of a cusp O+ ouflow on the strength of magnetospheric convection, as measured by the cross polar cap potential (CPCP), is examined for a moderate geomagnetic storm. The response of the CPCP to the O+ outflow is found to depend upon two competing factors. The reduction in ionospheric conductance when outflow is present increases the CPCP and the inflation of the magnetosphere due to an O+-enhanced ring current decreases the CPCP. Through controlled global simulations of geopsace it is shown that ionospheric O+ ions can generate 2-4 hour, planetary-scale, sawtooth oscillations. If the outflow fluence is above a threshold, convection transitions from a quasi-steady mode to the quasi-periodic sawtooth mode. The O+ ions promote sawtooth oscillations by reducing the nightside reconnection potential, which results in the increase of open flux to an unstable level, and by generating an outward force balance in the plasma sheet, which stretches the nightside field lines and facilitates plasmoid formation. This behavior has not previously been captured by a global simulation and represents a major breakthrough in the understanding of the dynamics of convection in the magnetosphere.
