scholarly journals Ionospheric specification from GPS data and the RIBG ionospheric propagation model

Radio Science ◽  
1997 ◽  
Vol 32 (4) ◽  
pp. 1671-1679 ◽  
Author(s):  
Michael H. Reilly ◽  
Malkiat Singh
Keyword(s):  
Propagation Model ◽  
Gps Data ◽  
Ionospheric Propagation

scholarly journals Ducted whistler-mode signals received at two widely spaced locations

1996 ◽  
Vol 14 (6) ◽  
pp. 619-627 ◽  
Author(s):  
M. A. Clilverd ◽  
N. R. Thomson ◽  
A. J. Smith
Keyword(s):  
New Zealand ◽  
Southern Hemisphere ◽  
Group Delay ◽  
Propagation Model ◽  
Propagation Time ◽  
Whistler Mode ◽  
Exit Region ◽  
Ionospheric Propagation ◽  
Delay Times

Abstract. Whistler-mode signals from a single VLF transmitter that have propagated in the same duct, have been observed simultaneously at Faraday, Antarctica (65°S, 64°W) and Dunedin, New Zealand (46°S, 171°E). The signals received have group-delay times that differ in the order of 10 ms, which can be explained by the differences in southern-hemisphere sub-ionospheric propagation time from duct exit region to receiver for the two sites. This difference has been used to determine the location of the duct exit region, with confirmation provided by arrival-bearing information from both sites. The whistler-mode signals typically occur one or two days after geomagnetic activity, with Kp\\geq5. The sub-ionospheric-propagation model, LWPC, is used to estimate the whistler-mode power radiated from the duct exit region. These results are then combined with estimated loss values for ionospheric and ducted transmission to investigate the role of wave-particle amplification or absorption. On at least half of the events studied, plasmaspheric amplification of the signals appears to be needed to explain the observed whistler-mode signal strengths.

The coastal refraction-diffraction wave propagation model

1995 ◽  
Vol 17 (4) ◽  
pp. 6-12
Author(s):  
Nguyen Tien Dat ◽  
Dinh Van Manh ◽  
Nguyen Minh Son
Keyword(s):  
Wave Propagation ◽  
Field Data ◽  
Surf Zone ◽  
Propagation Model ◽  
Wave Transformation ◽  
Diffraction Effect ◽  
Linear Wave ◽  
Diffraction Wave ◽  
Linear Wave Propagation ◽  
Wave Propagation Model

A mathematical model on linear wave propagation toward shore is chosen and corresponding software is built. The wave transformation outside and inside the surf zone is considered including the diffraction effect. The model is tested by laboratory and field data and gave reasonables results.

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