ATTENUATION OF HYDROMAGNETIC EMISSIONS IN THE IONOSPHERIC WAVEGUIDE.
Abstract
It has been suggested that hydromagnetic (hm) emissions propagate toward the equator from high latitudes in an ionospheric waveguide centered at the Alfven velocity minimum in the F region. In the present paper the effects of absorption in and around the waveguide are considered. In order to simplify the mathematical treatment the ionospheric Alfven velocity profile is approximated by a squarewell profile. A conventional mode theory analysis - valid for all wavelengths - is then carried out. It is found that at hm-emission frequencies (around 1 cps) and for distances of several thousand miles, there is moderate nighttime waveguide attenuation at sunspot maximum and negligible attenuation at sun-spot minimum. Also the calculated value of group velocity for nighttime sun-spot minimum is in close agreement with experimental observation. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 25, 1966
- Accession Number
- AD0481992
Entities
People
- Lee Tepley
- R. C. Wentworth
Organizations
- Lockheed Martin Missiles and Space