Download Free The Effect Of A Ring Current On The Boundary Of The Geomagnetic Field In A Steady Solar Wind By Jrspreiter And Ayalksne Book in PDF and EPUB Free Download. You can read online The Effect Of A Ring Current On The Boundary Of The Geomagnetic Field In A Steady Solar Wind By Jrspreiter And Ayalksne and write the review.

Published by the American Geophysical Union as part of the History of Geophysics Series, Volume 7. The beginnings of magnetospheric physics were the beginnings of space physics, of the marvelous discoveries made from in situ measurements from rockets and satellites and from increasingly sophisticated ground-based measurements and computer-assisted theoretical and empirical research. The beginnings of magnetospheric physics are also intimately connected with the International Geophysical Year 1957-58, the greatest world-wide cooperative scientific event in history. From the period following World War II until the late 1960s, the United States, and world physics and engineering in general, entered a new level of large-scale research epitomized by "space physics." Covering the period roughly 1958-1967, this volume contains personal accounts from those pioneers whose pathfinding research initiated and solidified the field of magnetospheric physics. Here are accounts of the first rocket and satellite studies, of the discovery of the magnetosphere and Van Allen belts, of early models of the physics of the space around our Earth and of the Earth's environment within the Sun's plasma. Studies of the magnetosphere of the Earth led directly to our knowledge of the plasma environment around other planets and throughout our solar system. The authors of papers in this volume were in at the beginning, pioneers who played a significant role in the early years of magnetospheric physics.
Approximate solutions are given for the shape of the boundary separating a steady neutral stream of ionized solar corpuscles from the combined magnetic fields of a three-dimensional dipole and an equatorial ring current. Results are presented for the traces of the boundary in the geomagnetic meridian plane containing the sun-earth line for several orientations of the latter relative to the dipole axis, and for the trace of the boundary in the geomagnetic equatorial plane for the case in which the dipole axis is normal to the sun-earth line. It is found that the presence of a ring current having values for the diameter and strength of the order proposed to explain in the magnetometer data from Pioneer I and Pioneer V has the effect of greatly increasing the size, as well as altering the form, of the region within which the geomagnetic field is confined.
An approximate formulation of the steady-state Chapman-Ferraro problem, given recently by Davis and Beard, is used to calculate the coordinates of the complete boundary of the geomagnetic field. Field lines are then computed in the magnetic meridian plane containing the free-stream direction of the solar wind, taking into account the distorting effects of currents flowing in the boundary. Numerical results are given for the case where the geomagnetic dipole axis is perpendicular to the direction of the solar wind.
The response of the magnetosphere boundary in a steady solar wind to small initial departures from equilibrium is investigated in accordance with the classical model of Chapman and Ferraro. If the wavelength and amplitude are sufficiently small that curvature and second-order effects can be disregarded, all perturbations, except those having wave fronts aligned with the direction of the local magnetic field, are found to damp exponentially with time and to drift along the boundary with the tangential component of the solar wind. Aligned waves, which neither damp nor amplify in this approximation, are examined further by inclusion of curvature and higher order effects. A first-order analysis shows that curvature introduces a destabilizing effect in small regions in the vicinity of the neutral points and a stabilizing effect elsewhere. Possible geophysical consequences, such as the persistent magnetic agitation of the polar regions, are discussed. An exact solution for an aligned cylindrical solitary wave having an initial form of a circular arc is also presented to illustrate a mode of response that appears to permit injection of elongated and widely separated columns of solar wind plasma into the magnetosphere under certain conditions and to provide a mechanism for momentum transfer from the solar wind to the ambient magnetosphere plasma.