Title :
A Resonance Mode Tracker for the Electromagnetic Earth-Ionosphere Cavity
Author :
Nelson, Philip H. ; Madden, Theodore R.
Author_Institution :
Dept. of Geology and Geophysics, Massachusetts Institute of Technology, Cambridge, Mass. now with the Geophysics Division R&D, Kennecott Copper Corp., Salt Lake City, Utah 84104
fDate :
5/1/1968 12:00:00 AM
Abstract :
An analog tracking device has been constructed which continuously monitors the peak frequency and Q of the first (8 Hz) resonance mode of the earth-ionosphere cavity. The device employs a phaselock technique to keep a tracking filter tuned to the center frequency of the natural spectral peak. Data from the resonance mode tracker illustrate the response of the cavity resonance to ionospheric disturbances, and to the source-receiver geometry.
Keywords :
Filters; Frequency; Geology; Geophysical measurement techniques; Geophysics; Ground penetrating radar; Ionosphere; Magnetic analysis; Magnetic resonance; Magnetic separation;
Journal_Title :
Geoscience Electronics, IEEE Transactions on
DOI :
10.1109/TGE.1968.271234
