Physics
Scientific paper
Jul 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jatp...48..671s&link_type=abstract
Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 48, July 1986, p. 671-683.
Physics
16
Atmospheric Models, Electron Energy, Geomagnetism, Ionospheric Electron Density, Magnetic Field Configurations, Vlf Emission Recorders, Periodic Variations, Plasma-Electromagnetic Interaction, Ray Tracing, Very Low Frequencies
Scientific paper
A model for the temperature variation along geomagnetic field lines is described. The temperature gradient along the field line is 0.9-1.6 deg/km during the day and 0.5-0.7 deg/km during the night at 1000 km, and it reduces to about half of these values at 2000 km, for the altitude range 35-50 deg. A ray-tracing model is developed, and the effects of changes in temperature on electron density distribution and VLF paths are analyzed. It is shown that unducted ray paths are altered from their corresponding paths in an equivalent isothermal model, there is greater refraction, and magnetospheric reflection occurs at lower altitudes.
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