scholarly journals Enhanced ELF wave generation efficiency using ‘O’ Mode HF heating of the ionosphere: An instrumental explanation

1998 ◽  
Vol 25 (18) ◽  
pp. 3489-3492
Author(s):  
Richard Barr ◽  
P. Stubbe ◽  
M. T. Rietveld ◽  
E. Nielsen
Keyword(s):  
Wave Generation ◽  
Generation Efficiency ◽  
Hf Heating

Enhanced ELF wave generation efficiency using ‘O' mode HF heating

1997 ◽  
Vol 24 (11) ◽  
pp. 1403-1406 ◽  
Author(s):  
Richard Barr ◽  
P. Stubbe ◽  
M. T. Rietveld ◽  
E. Nielsen
Keyword(s):  
Wave Generation ◽  
Generation Efficiency ◽  
Hf Heating

Experimental and Numerical Studies on ELF/VLF Wave Generation by Amplitude-Modulated HF Heating Waves

2003 ◽  
Vol 67 (5) ◽  
pp. 448-452 ◽  
Author(s):  
S P Kuo ◽  
S H Lee ◽  
D Bivolaru ◽  
P Kossey ◽  
M C Lee ◽  
...  
Keyword(s):  
Wave Generation ◽  
Numerical Studies ◽  
Hf Heating

VLF-HF heating of the lower ionosphere and ELF wave generation

1992 ◽  
Vol 19 (4) ◽  
pp. 61-64 ◽  
Author(s):  
Y. N. Taranenko ◽  
U. S. Inan ◽  
T. F. Bell
Keyword(s):  
Lower Ionosphere ◽  
Wave Generation ◽  
Hf Heating

BROADBAND TERAHERTZ WAVE GENERATION, DETECTION AND COHERENT CONTROL USING TERAHERTZ GAS PHOTONICS

2011 ◽  
Vol 20 (01) ◽  
pp. 3-12 ◽  
Author(s):  
JINGLE LIU ◽  
JIANMING DAI ◽  
XIAOFEI LU ◽  
I-CHEN HO ◽  
X.-C. ZHANG
Keyword(s):  
Coherent Control ◽  
Detection Efficiency ◽  
Nonlinear Coefficient ◽  
Terahertz Wave ◽  
Wave Generation ◽  
Generation Efficiency ◽  
Third Order ◽  
Thz Wave ◽  
Gas Molecules ◽  
Different Gases

Terahertz (THz) gas photonics uses gas as THz emitter and sensor for time-domain spectroscopy. Unique properties of the gas promise scalable, strong THz wave generation with broad spectral range covering the entire THz gas (0.3 THz to 35 THz). The systematic study of THz wave generation and detection in different gases shows that the generation efficiency is monotonically decreasing with the ionization potential of the gas molecules while the detection efficiency is linearly proportional to the third order nonlinear coefficient of the gas molecules. We also discuss the development of THz wave detection using laser-induced fluorescence and coherent control with THz gas photonics.

scholarly journals ELF wave generation in the ionosphere using pulse modulated HF heating: initial tests of a technique for increasing ELF wave generation efficiency

1999 ◽  
Vol 17 (6) ◽  
pp. 759-769 ◽  
Author(s):  
R. Barr ◽  
P. Stubbe ◽  
M. T. Rietveld
Keyword(s):  
Fundamental Frequency ◽  
Lower Ionosphere ◽  
Wave Generation ◽  
Cooling Time ◽  
Ionospheric Currents ◽  
Time Constants ◽  
Radio Science ◽  
Heating And Cooling ◽  
Hf Heating ◽  
Even Harmonics

Abstract. This paper describes the results of a preliminary study to determine the effective heating and cooling time constants of ionospheric currents in a simulated modulated HF heating, `beam painting' configuration. It has been found that even and odd harmonics of the fundamental ELF wave used to amplitude modulate the HF heater are sourced from different regions of the ionosphere which support significantly different heating and cooling time constants. The fundamental frequency and its odd harmonics are sourced in a region of the ionosphere where the heating and cooling time constants are about equal. The even harmonics on the other hand are sourced from regions of the ionosphere characterised by ratios of cooling to heating time constant greater than ten. It is thought that the even harmonics are sourced in the lower ionosphere (around 65 km) where the currents are much smaller than at the higher altitudes around 78 km where the currents at the fundamental frequency and odd harmonics maximise.Key words. Electromagnetics (antennae) · Ionosphere (active experiments) · Radio science (non linear phenomena)

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