Theory of Magnetospheric Hydromagnetic Waves Excited by Energetic Ring-current Protons PDF Download
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Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
A general theoretical formulation, allowing finite ion Larmor radii, general magnetic field geometries and plasma equilibria, has been developed to investigate excitations of magnetohydrodynamic (MHD) Alfven waves within the earth's magnetosphere by the storm-time energetic ring-current protons. In particular, it is found that for adiabatically injected protons, various predicted instability properties are consistent with satellite observations. 8 refs.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
A general theoretical formulation, allowing finite ion Larmor radii, general magnetic field geometries and plasma equilibria, has been developed to investigate excitations of magnetohydrodynamic (MHD) Alfven waves within the earth's magnetosphere by the storm-time energetic ring-current protons. In particular, it is found that for adiabatically injected protons, various predicted instability properties are consistent with satellite observations. 8 refs.
Author: Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
The objective of this research in magnetospheric physics was to advance understanding of the interaction of ring current ions with magnetospheric hydromagnetic waves. The goal was to examine the excitation of westward propagating hydromagnetic waves by drift-bounce resonance with 100 to 200 MeV ring current protons using a 3D MHD code in dipole geometry which incorporates the ring current ions via a gyrokinetic treatment. This was the first self-consistent study of this phenomenon. An extension of the ring current particle trajectory tracing code, developed with Air Force support, was used to study the rapid formation of new electron and proton radiation belts. The model has been highly successful at explaining the observed acceleration of electrons and protons by tens of MeV in less than a drift period.
Author: Publisher: ISBN: Category : Languages : en Pages : 17
Book Description
In order to study nonlinear wave-particle interactions in the earth's magnetosphere we have derived Hamiltonian equations for the gyrophase-averaged nonrealistic motion of charged particles in a perturbed dipole magnetic field. We assume low frequency (less than the proton gyrofrequency) fully electromagnetic perturbations, and we retain finite Larmor radius effects. Analytic and numerical results for the stochastic threshold of energetic protons ({approx gt} 100 keV) in compressional geomagnetic pulsations in the Pc 5 range of frequencies (150--600 seconds) are presented. These protons undergo a drift-bounce resonance with the Pc 5 waves which breaks the second (longitudinal) and third (flux) adiabatic invariants, while the first invariant (the magnetic moment) and the proton energy are approximately conserved. The proton motion in the observed spectrum of waves is found to be strongly diffusive, due to the overlap of neighboring primary resonances. 17 refs., 2 figs.
Author: Publisher: ISBN: Category : Power resources Languages : en Pages : 576
Book Description
Semiannual, with semiannual and annual indexes. References to all scientific and technical literature coming from DOE, its laboratories, energy centers, and contractors. Includes all works deriving from DOE, other related government-sponsored information, and foreign nonnuclear information. Arranged under 39 categories, e.g., Biomedical sciences, basic studies; Biomedical sciences, applied studies; Health and safety; and Fusion energy. Entry gives bibliographical information and abstract. Corporate, author, subject, report number indexes.
Author: A.D.M. Walker Publisher: CRC Press ISBN: 1420034006 Category : Science Languages : en Pages : 570
Book Description
Solar-terrestrial physics deals with phenomena in the region of space between the surface of the Sun and the upper atmosphere of the Earth, a region dominated by matter in a plasma state. This area of physics describes processes that generate the solar wind, the physics of geospace and the Earth's magnetosphere, and the interaction of magnetospheri
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Author: Liu Chen
Author: Anthony Arthur Chan
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Author: COSPAR. Scientific Commission D. D2.2 Meeting
Author: A.D.M. Walker