The Role of Hydromagnetic Waves in the Magnetosphere and the Ionosphere
Abstract
Four research areas were investigated: (1). the propagation and coupling of hydromagnetic waves in the magnetosphere. The coupled hydromagnetic equations in the dipole model of the magnetosphere were solved numerically. A reconstruction of the long period waves in an actual geomagnetic storm was demonstrated (2). non-linear wave-particle interactions in the magnetosphere. Anomalous cross-field diffusion of trapped energetic protons may result in proton precipitation in the equatorial region; (3). the filamentation instability of large amplitude hydromagnetic waves in the solar wind plasma. This work is relevant to observations of Alven waves and magnetosonic waves in space plasmas; (4). parametric excitation of whistler waves in the high latitude ionosphere by a high frequency heater transmitting from the ground. It has been shown that whistler waves and Langmuir waves can be excited by ionospheric heaters. The instability which produces these waves offers a potential mechanism to generate large amplitude long period waves in the ionosphere.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 31, 1991
- Accession Number
- ADA248332
Entities
People
- J. Huang
- M. H. Whang
- S. P. Kuo