Some Considerations of near-Earth Space as a Gaseous Dielectric
My assigned topic, the gaseous dielectric properties of matter resident in near-Earth space, is unusual. It is necessary first to identify the diverse plasma populations, then explain the sense in which they may be regarded as gaseous dielectrics. We focus specifically on regions called the ionosphere and the magnetosphere. The ionosphere is a layer of cold plasma that extends from < 100 to >IOOO km above the Earth. This plasma is created by solar ultraviolet light and by energetic particles from the magnetosphere. It is usually divided into D, E, and F layers. The D and E layers range in altitude from 60–95 km and 100–150 km, respectively. Outside the auroral oval they are mostly dayside features that disappear due to ion-electron recombination after sunset. Maximum plasma densities of ~106 cm−3 occur at F layer altitudes between 300 and 400 km on the dayside.
KeywordsAttenuation Recombination Propa Refraction Geophysics
Unable to display preview. Download preview PDF.
- 1.E. C. Roelof and D. G. Siebeck, Magnetopause shape as a bivariate function of interplanetary magnetic field Bz and solar wind dynamic pressure, J. Geophys. Res., 98,21,42121450, (1993).Google Scholar
- 2.M. C. Kelley, The Earths Ionosphere Plasma Physics and Electrodynamics, Vol. 43, International Geophysics Series, (Academic Press San Diego, 1989), pp. 65–92.Google Scholar
- 3.T. H. Stix, The Theory of Plasma Waves, (McGraw-Hill Co., New York, 1962), pp. 5–65, pp. 185–234.Google Scholar
- 6.R. A. Helliwell, Whistlers and Related Ionospheric Phenomena, (Stanford U. Press, Stanford, CA, 1965).Google Scholar
- 7.B. Rossi and S. Olbert, Introduction to the Physics of Space, (McGraw-Hill Co., New York, 1970), pp. 149–155.Google Scholar
- 12.W. L. Imhof, J. B., Reagan, H. D. Voss, E. E Gaines,. R. A. Helliwell, U. S. Inan, J. Katsufrakis, and R. G. Joiner, Direct observation of radiation belt electrons precipitated by the controlled injection of VLF signals from a ground-based antenna, Geophys. Res. Lett., 10, 361–364, (1983).CrossRefGoogle Scholar
- 13.D. L. Carpenter, R. R. Anderson, W. Calvert, and M. Moldwin, CRRES observations of density cavities inside the plasmasphere, J. Geophys. Res., 105,23,323–23,338, (2000).Google Scholar