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Accession Number:
AD0481992
Title:
ATTENUATION OF HYDROMAGNETIC EMISSIONS IN THE IONOSPHERIC WAVEGUIDE.
Corporate Author:
LOCKHEED MISSILES AND SPACE CO INC PALO ALTO CA PALO ALTO RESEARCH LAB
Report Date:
1966-03-25
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
Descriptive Note:
Semiannual rept. 1 Sep 65-28 Feb 66,
Pages:
0045
Contract Number:
AF 33(657)-15303
Contract Number 2:
ARPA Order-704
File Size:
0.00MB
