ON THE PROPAGATION OF E.L.F. PULSES IN THE EARTH–IONOSPHERE WAVE GUIDE

1962 ◽  
Vol 40 (10) ◽  
pp. 1360-1369 ◽  
Author(s):  
James R. Wait
Keyword(s):  
Spectral Analysis ◽  
Frequency Dependence ◽  
Time Domain ◽  
Propagation Constant ◽  
Low Frequency ◽  
Wave Guide ◽  
Transient Responses ◽  
Extremely Low Frequency ◽  
The Earth ◽  
Wave Forms

The paper is concerned with the connection between frequency domain and time domain for propagation in the earth–ionosphere wave guide. Attention is focussed on the extremely low frequency (e.l.f.) range. It is assumed that the propagation constant is proportional to (frequency)v where v is a fraction between 0 and 1. For such a frequency law, the corresponding transient responses are computed. These illustrate a number of important points. In particular, it is indicated that the frequency dependence of the propagation constant could be estimated directly from the wave forms themselves without resorting to conventional spectral analysis.

scholarly journals TSUNAMIS SOME LABORATORY AND FIELD OBSERVATIONS

1970 ◽  
Vol 1 (12) ◽  
pp. 127
Author(s):  
Frederick Raichlen
Keyword(s):  
Spectral Analysis ◽  
Analytical Model ◽  
Field Observations ◽  
Wave Tank ◽  
Analysis Techniques ◽  
Laboratory Facility ◽  
Wave Forms ◽  
Harmonic Components ◽  
Field Stations ◽  
Chilean Earthquake

A unique laboratory facility to generate waves by impulsive movements of the bottom of a wave tank is described and examples of the wave forms which result are shown An analytical model is presented for the case of rapid bottom movements which describes, in a qualitative way, certain features of the experiments Marigrams from various field stations for the tsunamis from the Chilean earthquake of I960 and the Alaskan earthquake of 1964 have been analyzed using spectral analysis techniques to determine the harmonic components of these records Comparisons are made between the spectra of the two tsunamis at each of several locations.

scholarly journals Interpretation of Radio-Echo Returns from Internal Water Bodies in Variegated Glacier, Alaska, U.S.A.

1987 ◽  
Vol 33 (115) ◽  
pp. 319-323 ◽  
Author(s):  
Robert W. Jacobel ◽  
Stefan K. Anderson
Keyword(s):  
Spectral Analysis ◽  
Thin Layer ◽  
Computer Simulations ◽  
Simplified Model ◽  
Wave Form ◽  
Cavity Size ◽  
Additional Information ◽  
Dielectric Contrast ◽  
Radio Echo Sounding ◽  
Wave Forms

AbstractRadio echo-sounding studies were used to detect water-filled cavities on Variegated Glacier, Alaska, during its surge in 1983. Cavity locations were determined by spatial surveys, and changes in cavity size and water content over a 5 week period were inferred from phase and amplitude changes in the echo wave form. Data were taken at both 4 and 8 MHz central frequencies of the impulse transmitter. These bi-frequency results, together with spectral analysis of the digitized wave forms, were used to provide additional information about the cavity dimensions. Cavity response is interpreted in terms of a simplified model of a thin layer of strong dielectric contrast. Computer simulations of radar pulses encountering such layers reproduce the main features of the data.

scholarly journals Interpretation of Radio-Echo Returns from Internal Water Bodies in Variegated Glacier, Alaska, U.S.A.

1987 ◽  
Vol 33 (115) ◽  
pp. 319-323 ◽  
Author(s):  
Robert W. Jacobel ◽  
Stefan K. Anderson
Keyword(s):  
Spectral Analysis ◽  
Thin Layer ◽  
Computer Simulations ◽  
Simplified Model ◽  
Wave Form ◽  
Cavity Size ◽  
Additional Information ◽  
Dielectric Contrast ◽  
Radio Echo Sounding ◽  
Wave Forms

AbstractRadio echo-sounding studies were used to detect water-filled cavities on Variegated Glacier, Alaska, during its surge in 1983. Cavity locations were determined by spatial surveys, and changes in cavity size and water content over a 5 week period were inferred from phase and amplitude changes in the echo wave form. Data were taken at both 4 and 8 MHz central frequencies of the impulse transmitter. These bi-frequency results, together with spectral analysis of the digitized wave forms, were used to provide additional information about the cavity dimensions. Cavity response is interpreted in terms of a simplified model of a thin layer of strong dielectric contrast. Computer simulations of radar pulses encountering such layers reproduce the main features of the data.

Spectral analysis of asymmetry training effect for depression

2008 ◽  
Author(s):  
Ji Ha Lee ◽  
Sung Won Choi ◽  
Ji Sun Min ◽  
Eun Ju Jaekal ◽  
Gyhye Sung
Keyword(s):  
Spectral Analysis ◽  
Training Effect

Some problems in the spectral analysis of human behavior records

1953 ◽  
Author(s):  
C. J. Burke ◽  
R. Narasimhan ◽  
O. J. Benepe
Keyword(s):  
Spectral Analysis ◽  
Human Behavior
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