DocumentCode
905432
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
Volume
6
Issue
2
fYear
1968
fDate
5/1/1968 12:00:00 AM
Firstpage
70
Lastpage
77
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;
fLanguage
English
Journal_Title
Geoscience Electronics, IEEE Transactions on
Publisher
ieee
ISSN
0018-9413
Type
jour
DOI
10.1109/TGE.1968.271234
Filename
4043214
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