Waves and Particles in the Magnetosphere
- 158 Downloads
My first topic will be to discuss the propagation of hydromagnetic waves in the magnetosphere and consider a mechanism for generating them at the magnetospheric boundary. Unfortunately this topic is highly speculative; a condition which results from the lack of experimental data. As a consequence of Van Allen’s discovery of the radiation belts, experimentalists, for the past decade, have been investigating the charged-particle population of the magnetosphere. Hopefully, future experimenters will give the wave aspects of the magnetosphere the attention they warrant. It is only in this way that our understanding of the magnetosphere will be developed fully. My discussion will proceed in the following manner. We shall consider (1) hydromagnetic waves in a uniform magnetic field ; (2) hydromagnetic waves in an axially symmetric magnetic field; and (3) the Kelvin-Helmholtz instability. In other words, we begin with an elementary topic and progress to a condition, which although idealized, is representative of the magnetosphere. Finally we shall discuss a problem which is far from being resolved — the Kelvin-Helmholtz instability as it applies to the boundary of the magnetosphere and serves as a source of (highly asymmetric) hydromagnetic waves.
KeywordsSolar Wind Wave Packet Current Sheet Pitch Angle Auroral Oval
Unable to display preview. Download preview PDF.
- Das, A. C.: 1968, ‘A Mechanism for YLF Emissions’, Imperial College Report No. SP/68/1, 1968; J. Geophys. Res. (in press).Google Scholar
- Davis, L. R. and Williamson, J. M.: 1966, in Radiation Trapped in the Earth’s Magnetic Field (ed. by B. M. McCormac), D. Reidel Publ. Comp., Dordrecht.Google Scholar
- Davis, L. R., Hoffman, R. A., and Williamson, J. M.: 1964, Trans. Am. Geophys. Union 45, 85.Google Scholar
- Dungey, J. W.: 1967, ‘Hydromagnetic Waves’, in Physics of Geomagnetic Phenomena (ed. by S. Matsushita and W. J. Campbell), Academic Press, New York, Vol. 2, pp. 913–933.Google Scholar
- Roberts, Ch. F.: 1966, in Radiation Trapped in Earth’s Magnetic Field (ed. by B. M. McCormac), D. Reidel Publ. Comp., Dordrecht, pp. 403–421.Google Scholar